diff --git a/Dockerfile b/Dockerfile
index 75d31139efe..f5d714a3202 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -238,7 +238,7 @@ ENV PUB_CACHE=/opt/dart/pub-cache \
   PUB_ENVIRONMENT="dependabot" \
   PATH="${PATH}:/opt/dart/dart-sdk/bin"
 
-ARG DART_VERSION=2.16.2
+ARG DART_VERSION=2.17.0
 RUN DART_ARCH=${TARGETARCH} \
   && if [ "$TARGETARCH" = "amd64" ]; then DART_ARCH=x64; fi \
   && curl --connect-timeout 15 --retry 5 "https://storage.googleapis.com/dart-archive/channels/stable/release/${DART_VERSION}/sdk/dartsdk-linux-${DART_ARCH}-release.zip" > "/tmp/dart-sdk.zip" \
@@ -248,42 +248,13 @@ RUN DART_ARCH=${TARGETARCH} \
   && chmod -R o+rx "/opt/dart/dart-sdk" \
   && rm "/tmp/dart-sdk.zip" \
   && dart --version
-# We pull the dependency_services from the dart-lang/pub repo as it is not
-# exposed from the Dart SDK (yet...).
-RUN git clone https://github.com/dart-lang/pub.git /opt/dart/pub \
-  && git -C /opt/dart/pub checkout 6f20a94b074a1c2dc82d429fa04d365b4bcf65b6 \
-  && dart pub global activate --source path /opt/dart/pub \
-  && chmod -R o+r "/opt/dart/pub" \
-  && chown -R dependabot:dependabot "$PUB_CACHE" \
-  && chown -R dependabot:dependabot /opt/dart/pub
-
-# Install Flutter
-ARG FLUTTER_VERSION=2.10.3
-RUN curl --connect-timeout 15 --retry 5 "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_${FLUTTER_VERSION}-stable.tar.xz" > "/tmp/flutter.xz" \
-  && tar xf "/tmp/flutter.xz" -C /opt/dart \
-  && rm "/tmp/flutter.xz" \
-  && chmod -R o+rx "/opt/dart/flutter" \
-  && chown -R dependabot:dependabot "/opt/dart/flutter" \
-  # To reduce space usage we delete all of the flutter sdk except the few
-  # things needed for pub resolutions:
-  # * The version file
-  # * The flutter sdk packages.
-  && find "/opt/dart/flutter" \
-    ! -path '/opt/dart/flutter/version' \
-    ! -path '/opt/dart/flutter/packages/*' \
-    ! -path '/opt/dart/flutter/packages' \
-    ! -path '/opt/dart/flutter/bin/cache/pkg/*' \
-    ! -path /opt/dart/flutter/bin/cache/pkg \
-    ! -path /opt/dart/flutter/bin/cache \
-    ! -path /opt/dart/flutter/bin \
-    ! -path /opt/dart/flutter \
-    -delete
 
 COPY --chown=dependabot:dependabot LICENSE /home/dependabot
 COPY --chown=dependabot:dependabot composer/helpers /opt/composer/helpers
 COPY --chown=dependabot:dependabot bundler/helpers /opt/bundler/helpers
 COPY --chown=dependabot:dependabot go_modules/helpers /opt/go_modules/helpers
 COPY --chown=dependabot:dependabot hex/helpers /opt/hex/helpers
+COPY --chown=dependabot:dependabot pub/helpers /opt/pub/helpers
 COPY --chown=dependabot:dependabot npm_and_yarn/helpers /opt/npm_and_yarn/helpers
 COPY --chown=dependabot:dependabot python/helpers /opt/python/helpers
 COPY --chown=dependabot:dependabot terraform/helpers /opt/terraform/helpers
@@ -300,6 +271,7 @@ RUN bash /opt/composer/helpers/v2/build
 RUN bash /opt/go_modules/helpers/build
 RUN bash /opt/hex/helpers/build
 RUN bash /opt/npm_and_yarn/helpers/build
+RUN bash /opt/pub/helpers/build
 RUN bash /opt/python/helpers/build
 RUN bash /opt/terraform/helpers/build
 
diff --git a/pub/.gitignore b/pub/.gitignore
index 06845bd78c0..95ec49e69c0 100644
--- a/pub/.gitignore
+++ b/pub/.gitignore
@@ -3,3 +3,5 @@
 /tmp
 /dependabot-*.gem
 Gemfile.lock
+.dart_tool/
+.packages
diff --git a/pub/README.md b/pub/README.md
index b0c0d47bcb1..b90ad1178a4 100644
--- a/pub/README.md
+++ b/pub/README.md
@@ -14,7 +14,6 @@ Dart (pub) support for [`dependabot-core`][core-repo].
  - If the version found is ignored (by dependabot config) no update will happen (even if, an earlier version could be used)
  - Limited metadata support (just retrieves the repository link).
  - No support for auhtentication of private package repositories (mostly a configuration issue).
- - Only stable versions of Dart and Flutter supported.
  - `updated_dependencies_after_full_unlock` only allows updating to a later version, if the latest version that is mutually compatible with other dependencies is the latest version of the said package. This is a dependabot limitation.
 
 ### Running locally
@@ -36,6 +35,8 @@ Dart (pub) support for [`dependabot-core`][core-repo].
 The `dart pub` repo offers an experimental dependency services interface which
 allows checking for available updates.
 
+It is implemented as helpers/bin/dependency_services.dart, that is mainly a wrapper around the implementation in the [pub client](https://github.com/dart-lang/pub).
+
 #### List Dependencies
 
 ```js
@@ -83,16 +84,16 @@ allows checking for available updates.
       "latest": "<version>",
 
       // In the following possible upgrades are listed for different
-      // 
+      //
       // The constraints are given in three versions, according to different
-      // strategies for updating constraint to allow the new version of a 
+      // strategies for updating constraint to allow the new version of a
       // package:
       //
       // * "constraintBumped": always update the constraint lower bound to match
       //   the new version.
       // * "constraintBumpedIfNeeded": leave the constraint if the original
       //   constraint allows the new version.
-      // * "constraintWidened": extend only the upper bound to include the new 
+      // * "constraintWidened": extend only the upper bound to include the new
       //   version.
 
       // If it is possible to upgrade the current version without making any
@@ -228,4 +229,21 @@ the url of the repository.
   "type": "git" || "hosted" || "path" || "sdk", // Name of the source.
   ... // Other keys are free form json information about the dependency
 }
-```
\ No newline at end of file
+```
+## Detection of Flutter and Dart SDK versions.
+
+`dependency_services` should be run in the context of the right Flutter and
+Dart SDK versions as these will affect package resolution.
+
+The pub dependabot integration supports the flutter releases on the `stable` and
+`beta`
+[channel](https://github.com/flutter/flutter/wiki/Flutter-build-release-channels).
+Each Flutter release comes with a matching Dart release.
+
+The `helpers/bin/infer_sdk_versions.dart` script will parse the root pubspec, and
+try to determine the right release based on the SDK constraints and the list of
+available releases:
+
+* The latest stable release that matches the SDK constraints will be chosen
+* If there is no stable release it will choose the newest beta that matches the
+SDK constraints.
\ No newline at end of file
diff --git a/pub/helpers/bin/dependency_services.dart b/pub/helpers/bin/dependency_services.dart
new file mode 100644
index 00000000000..36c7bda1984
--- /dev/null
+++ b/pub/helpers/bin/dependency_services.dart
@@ -0,0 +1,78 @@
+/// Support for automated upgrades.
+library dependency_services;
+
+import 'dart:async';
+
+import 'package:args/args.dart';
+import 'package:args/command_runner.dart';
+import 'package:pub/src/command.dart';
+import 'package:pub/src/command/dependency_services.dart';
+import 'package:pub/src/exit_codes.dart' as exit_codes;
+import 'package:pub/src/io.dart';
+import 'package:pub/src/log.dart' as log;
+
+class _DependencyServicesCommandRunner extends CommandRunner<int>
+    implements PubTopLevel {
+  @override
+  String? get directory => argResults['directory'];
+
+  @override
+  bool get captureStackChains => argResults['verbose'];
+
+  @override
+  bool get trace => argResults['verbose'];
+
+  ArgResults? _argResults;
+
+  /// The top-level options parsed by the command runner.
+  @override
+  ArgResults get argResults {
+    final a = _argResults;
+    if (a == null) {
+      throw StateError(
+          'argResults cannot be used before Command.run is called.');
+    }
+    return a;
+  }
+
+  _DependencyServicesCommandRunner()
+      : super('dependency_services', 'Support for automatic upgrades',
+            usageLineLength: lineLength) {
+    argParser.addFlag('verbose',
+        abbr: 'v', negatable: false, help: 'Shortcut for "--verbosity=all".');
+    argParser.addOption(
+      'directory',
+      abbr: 'C',
+      help: 'Run the subcommand in the directory<dir>.',
+      defaultsTo: '.',
+      valueHelp: 'dir',
+    );
+
+    addCommand(DependencyServicesListCommand());
+    addCommand(DependencyServicesReportCommand());
+    addCommand(DependencyServicesApplyCommand());
+  }
+
+  @override
+  Future<int> run(Iterable<String> args) async {
+    try {
+      _argResults = parse(args);
+      return await runCommand(argResults) ?? exit_codes.SUCCESS;
+    } on UsageException catch (error) {
+      log.exception(error);
+      return exit_codes.USAGE;
+    }
+  }
+
+  @override
+  void printUsage() {
+    log.message(usage);
+  }
+
+  @override
+  log.Verbosity get verbosity => log.Verbosity.normal;
+}
+
+Future<void> main(List<String> arguments) async {
+  await flushThenExit(await _DependencyServicesCommandRunner().run(arguments));
+}
diff --git a/pub/helpers/bin/infer_sdk_versions.dart b/pub/helpers/bin/infer_sdk_versions.dart
new file mode 100644
index 00000000000..3eeb111616a
--- /dev/null
+++ b/pub/helpers/bin/infer_sdk_versions.dart
@@ -0,0 +1,165 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:args/args.dart';
+import 'package:collection/collection.dart';
+import 'package:http/http.dart';
+import 'package:http/retry.dart';
+import 'package:yaml/yaml.dart';
+import 'package:pub_semver/pub_semver.dart';
+import 'package:path/path.dart' as p;
+
+Never fail(String message) {
+  stderr.writeln(message);
+  exit(-1);
+}
+
+final client = RetryClient(Client());
+
+ArgResults parseArgs(List<String> args) {
+  final argParser = ArgParser()
+    ..addOption(
+      'directory',
+      abbr: 'C',
+      defaultsTo: '.',
+      help: 'The directory containing the pubspec.yaml of the package.',
+    )
+    ..addOption('flutter-releases-url',
+        help:
+            'The url to retrieve the list of available flutter releases from.')
+    ..addFlag('help', help: 'Display the usage message.');
+  final results;
+  try {
+    results = argParser.parse(args);
+    if (results['help'] as bool) {
+      stdout.writeln(
+          'Infers the newest available flutter sdk to use for a package.');
+      stdout.writeln(argParser.usage);
+      exit(0);
+    }
+    return results;
+  } on FormatException catch (e) {
+    stderr.writeln(e.message);
+    stderr.writeln(argParser.usage);
+    exit(-1);
+  }
+}
+
+Map<String, VersionConstraint> parseSdkConstraints(dynamic pubspec) {
+  final dartConstraint =
+      VersionConstraint.parse(pubspec['environment']?['sdk'] ?? 'any');
+  final flutterConstraint =
+      VersionConstraint.parse(pubspec['environment']?['flutter'] ?? 'any');
+  return {
+    'dart': dartConstraint,
+    'flutter': flutterConstraint,
+  };
+}
+
+Future<void> main(List<String> args) async {
+  try {
+    final argResults = parseArgs(args);
+    var url = argResults['flutter-releases-url'];
+    if (url == null || url.isEmpty) {
+      url = flutterReleasesUrl;
+    }
+    final flutterReleases = await retrieveFlutterReleases(url);
+
+    final pubspecPath = p.join(argResults['directory'], 'pubspec.yaml');
+    final pubspec = loadYaml(File(pubspecPath).readAsStringSync(),
+        sourceUrl: Uri.file(pubspecPath));
+
+    final bestFlutterRelease =
+        inferBestFlutterRelease(parseSdkConstraints(pubspec), flutterReleases);
+    if (bestFlutterRelease == null) {
+      fail(
+        'No flutter release matching sdk constraints.',
+      );
+    }
+    stdout.writeln(JsonEncoder.withIndent('  ').convert({
+      'flutter': bestFlutterRelease.flutterVersion.toString(),
+      'dart': bestFlutterRelease.dartVersion.toString(),
+      'channel': {
+        Channel.stable: 'stable',
+        Channel.beta: 'beta',
+        Channel.dev: 'dev'
+      }[bestFlutterRelease.channel],
+    }));
+  } on FormatException catch (e) {
+    fail(e.message);
+  } finally {
+    client.close();
+  }
+}
+
+String get flutterReleasesUrl =>
+    'https://storage.googleapis.com/flutter_infra_release/releases/releases_linux.json';
+
+// Retrieves all released versions of Flutter.
+Future<List<FlutterRelease>> retrieveFlutterReleases(String url) async {
+  final response = await client.get(Uri.parse(url));
+  final decoded = jsonDecode(response.body);
+  if (decoded is! Map) throw FormatException('Bad response - should be a Map');
+  final releases = decoded['releases'];
+  if (releases is! List)
+    throw FormatException('Bad response - releases should be a list.');
+  final result = <FlutterRelease>[];
+  for (final release in releases) {
+    final channel = {
+      'beta': Channel.beta,
+      'stable': Channel.stable,
+      'dev': Channel.dev
+    }[release['channel']];
+    if (channel == null) throw FormatException('Release with bad channel');
+    final dartVersion = release['dart_sdk_version'];
+    // Some releases don't have an associated dart version, ignore.
+    if (dartVersion is! String) continue;
+    final flutterVersion = release['version'];
+    if (flutterVersion is! String) throw FormatException('Not a string');
+    result.add(FlutterRelease(
+      flutterVersion: Version.parse(flutterVersion),
+      dartVersion: Version.parse(dartVersion.split(' ').first),
+      channel: channel,
+    ));
+  }
+  return result
+      // Sort releases by channel and version.
+      .sorted((a, b) {
+        final compareChannels = b.channel.index - a.channel.index;
+        if (compareChannels != 0) return compareChannels;
+        return a.flutterVersion.compareTo(b.flutterVersion);
+      })
+      // Newest first.
+      .reversed
+      .toList();
+}
+
+/// The "best" Flutter release for a given set of constraints is the first one
+/// in [flutterReleases] that matches both the flutter and dart constraint.
+FlutterRelease? inferBestFlutterRelease(
+    Map<String, VersionConstraint> sdkConstraints,
+    List<FlutterRelease> flutterReleases) {
+  return flutterReleases.firstWhereOrNull((release) =>
+      (sdkConstraints['flutter'] ?? VersionConstraint.any)
+          .allows(release.flutterVersion) &&
+      (sdkConstraints['dart'] ?? VersionConstraint.any)
+          .allows(release.dartVersion));
+}
+
+enum Channel {
+  stable,
+  beta,
+  dev,
+}
+
+/// A version of the Flutter SDK and its related Dart SDK.
+class FlutterRelease {
+  final Version flutterVersion;
+  final Version dartVersion;
+  final Channel channel;
+  FlutterRelease({
+    required this.flutterVersion,
+    required this.dartVersion,
+    required this.channel,
+  });
+}
diff --git a/pub/helpers/build b/pub/helpers/build
new file mode 100755
index 00000000000..2ae52470118
--- /dev/null
+++ b/pub/helpers/build
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Precompiles the helper scripts for the pub integration.
+
+set -e
+
+if [ -z "$DEPENDABOT_NATIVE_HELPERS_PATH" ]; then
+  echo "Unable to build, DEPENDABOT_NATIVE_HELPERS_PATH is not set"
+  exit 1
+fi
+
+# Retrieve the dependencies
+dart pub get -C "$DEPENDABOT_NATIVE_HELPERS_PATH/pub/helpers"
+
+# Compile the helpers
+dart compile exe "$DEPENDABOT_NATIVE_HELPERS_PATH/pub/helpers/bin/dependency_services.dart" -o "$DEPENDABOT_NATIVE_HELPERS_PATH/pub/dependency_services"
+dart compile exe "$DEPENDABOT_NATIVE_HELPERS_PATH/pub/helpers/bin/infer_sdk_versions.dart" -o "$DEPENDABOT_NATIVE_HELPERS_PATH/pub/infer_sdk_versions"
diff --git a/pub/helpers/pubspec.lock b/pub/helpers/pubspec.lock
new file mode 100644
index 00000000000..9cfd2c98b27
--- /dev/null
+++ b/pub/helpers/pubspec.lock
@@ -0,0 +1,231 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "40.0.0"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.1.0"
+  args:
+    dependency: "direct main"
+    description:
+      name: args
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.3.1"
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.9.0"
+  cli_util:
+    dependency: transitive
+    description:
+      name: cli_util
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.5"
+  collection:
+    dependency: "direct main"
+    description:
+      name: collection
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.16.0"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.2"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.1.2"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.3"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.2"
+  http:
+    dependency: "direct main"
+    description:
+      name: http
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.13.4"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.2.0"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.0.1"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.8.0"
+  oauth2:
+    dependency: transitive
+    description:
+      name: oauth2
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.2"
+  path:
+    dependency: "direct main"
+    description:
+      name: path
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.8.2"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.5.0"
+  pub:
+    dependency: "direct main"
+    description:
+      path: "."
+      ref: "0ad17e8424e9989722f272e012636d9f43bb5205"
+      resolved-ref: "0ad17e8424e9989722f272e012636d9f43bb5205"
+      url: "https://github.com/dart-lang/pub"
+    source: git
+    version: "0.0.0"
+  pub_semver:
+    dependency: "direct main"
+    description:
+      name: pub_semver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.1"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.0"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.9.0"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.10.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.1"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.1"
+  usage:
+    dependency: transitive
+    description:
+      name: usage
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.0.2"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
+  yaml:
+    dependency: "direct main"
+    description:
+      name: yaml
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.1"
+  yaml_edit:
+    dependency: transitive
+    description:
+      name: yaml_edit
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.3"
+sdks:
+  dart: ">=2.16.0 <3.0.0"
diff --git a/pub/helpers/pubspec.yaml b/pub/helpers/pubspec.yaml
new file mode 100644
index 00000000000..cbeb6ab1656
--- /dev/null
+++ b/pub/helpers/pubspec.yaml
@@ -0,0 +1,15 @@
+name: helpers
+environment:
+  sdk: '>=2.16.0 <3.0.0'
+
+dependencies:
+  path: ^1.8.2
+  yaml: ^3.1.1
+  args: ^2.3.1
+  collection: ^1.16.0
+  pub_semver: ^2.1.1
+  http: ^0.13.4
+  pub:
+    git:
+     url: https://github.com/dart-lang/pub
+     ref: 0ad17e8424e9989722f272e012636d9f43bb5205
diff --git a/pub/lib/dependabot/pub/helpers.rb b/pub/lib/dependabot/pub/helpers.rb
index 1a6000c6130..7a2b8760f3a 100644
--- a/pub/lib/dependabot/pub/helpers.rb
+++ b/pub/lib/dependabot/pub/helpers.rb
@@ -11,6 +11,21 @@
 module Dependabot
   module Pub
     module Helpers
+      def self.pub_helpers_path
+        File.join(ENV["DEPENDABOT_NATIVE_HELPERS_PATH"], "pub")
+      end
+
+      def self.run_infer_sdk_versions(url: nil)
+        stdout, _, status = Open3.capture3(
+          {},
+          File.join(pub_helpers_path, "infer_sdk_versions"),
+          *("--flutter-releases-url=#{url}" if url)
+        )
+        return nil unless status.success?
+
+        JSON.parse(stdout)
+      end
+
       private
 
       def dependency_services_list
@@ -42,6 +57,94 @@ def dependency_services_apply(dependency_changes)
         end
       end
 
+      # Clones the flutter repo into /tmp/flutter if needed
+      def ensure_flutter_repo
+        return if File.directory?("/tmp/flutter/.git")
+
+        # Make a flutter checkout
+        _, stderr, status = Open3.capture3(
+          {},
+          "git",
+          "clone",
+          "--no-checkout",
+          "https://github.com/flutter/flutter",
+          chdir: "/tmp/"
+        )
+        raise Dependabot::DependabotError, "Cloning Flutter failed: #{stderr}" unless status.success?
+      end
+
+      # Will ensure that /tmp/flutter contains the flutter repo checked out at `ref`.
+      def check_out_flutter_ref(ref)
+        ensure_flutter_repo
+        # Ensure we have the right version (by tag)
+        _, stderr, status = Open3.capture3(
+          {},
+          "git",
+          "fetch",
+          "origin",
+          ref,
+          chdir: "/tmp/flutter"
+        )
+        raise Dependabot::DependabotError, "Fetching Flutter version #{ref} failed: #{stderr}" unless status.success?
+
+        # Check out the right version in git.
+        _, stderr, status = Open3.capture3(
+          {},
+          "git",
+          "checkout",
+          ref,
+          chdir: "/tmp/flutter"
+        )
+        return if status.success?
+
+        raise Dependabot::DependabotError, "Checking out flutter #{ref} failed: #{stderr}"
+      end
+
+      ## Detects the right flutter release to use for the pubspec.yaml.
+      ## Then checks it out if it is not already.
+      ## Returns the sdk versions
+      def ensure_right_flutter_release
+        @ensure_right_flutter_release ||= begin
+          versions = Helpers.run_infer_sdk_versions url: options[:flutter_releases_url]
+          flutter_ref = if versions
+                          "refs/tags/#{versions['flutter']}"
+                        else
+                          # Choose the 'stable' version if the tool failed to infer a version.
+                          "stable"
+                        end
+
+          check_out_flutter_ref flutter_ref
+
+          # Run `flutter --version` to make Flutter download engine artifacts and create flutter/version.
+          _, stderr, status = Open3.capture3(
+            {},
+            "/tmp/flutter/bin/flutter",
+            "doctor",
+            chdir: "/tmp/flutter/"
+          )
+          raise Dependabot::DependabotError, "Running 'flutter doctor' failed: #{stderr}" unless status.success?
+
+          # Run `flutter --version --machine` to get the current flutter version.
+          stdout, stderr, status = Open3.capture3(
+            {},
+            "/tmp/flutter/bin/flutter",
+            "--version",
+            "--machine",
+            chdir: "/tmp/flutter/"
+          )
+          unless status.success?
+            raise Dependabot::DependabotError,
+                  "Running 'flutter --version --machine' failed: #{stderr}"
+          end
+
+          parsed = JSON.parse(stdout)
+          {
+            "flutter" => parsed["frameworkVersion"],
+            "dart" => parsed["dartSdkVersion"]
+          }
+        end
+      end
+
       def run_dependency_services(command, stdin_data: nil)
         SharedHelpers.in_a_temporary_directory do
           dependency_files.each do |f|
@@ -49,26 +152,25 @@ def run_dependency_services(command, stdin_data: nil)
             FileUtils.mkdir_p File.dirname(in_path_name)
             File.write(in_path_name, f.content)
           end
+          sdk_versions = ensure_right_flutter_release
           SharedHelpers.with_git_configured(credentials: credentials) do
             env = {
               "CI" => "true",
               "PUB_ENVIRONMENT" => "dependabot",
-              "FLUTTER_ROOT" => "/opt/dart/flutter",
-              "PUB_HOSTED_URL" => options[:pub_hosted_url]
+              "FLUTTER_ROOT" => "/tmp/flutter",
+              "PUB_HOSTED_URL" => options[:pub_hosted_url],
+              # This variable will make the solver run assuming that Dart SDK version.
+              # TODO(sigurdm): Would be nice to have a better handle for fixing the dart sdk version.
+              "_PUB_TEST_SDK_VERSION" => sdk_versions["dart"]
             }
             Dir.chdir File.join(Dir.pwd, dependency_files.first.directory) do
               stdout, stderr, status = Open3.capture3(
                 env.compact,
-                "dart",
-                "--no-analytics",
-                "pub",
-                "global",
-                "run",
-                "pub:dependency_services",
+                File.join(Helpers.pub_helpers_path, "dependency_services"),
                 command,
                 stdin_data: stdin_data
               )
-              raise Dependabot::DependabotError, "dart pub failed: #{stderr}" unless status.success?
+              raise Dependabot::DependabotError, "dependency_services failed: #{stderr}" unless status.success?
               return stdout unless block_given?
 
               yield
diff --git a/pub/spec/dependabot/pub/file_parser_spec.rb b/pub/spec/dependabot/pub/file_parser_spec.rb
index 532baf89fc3..beffb517696 100644
--- a/pub/spec/dependabot/pub/file_parser_spec.rb
+++ b/pub/spec/dependabot/pub/file_parser_spec.rb
@@ -79,7 +79,7 @@
       let(:files) { project_dependency_files("broken_pubspec") }
       it "raises a helpful error" do
         expect { subject }.to raise_error(Dependabot::DependabotError) do |error|
-          expect(error.message).to start_with("dart pub failed: " \
+          expect(error.message).to start_with("dependency_services failed: " \
             "Error on line 2, column 1 of pubspec.yaml: Unexpected end of file.")
         end
       end
diff --git a/pub/spec/dependabot/pub/infer_sdk_versions_spec.rb b/pub/spec/dependabot/pub/infer_sdk_versions_spec.rb
new file mode 100644
index 00000000000..fdf3abfafd2
--- /dev/null
+++ b/pub/spec/dependabot/pub/infer_sdk_versions_spec.rb
@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+require "dependabot/dependency"
+require "dependabot/dependency_file"
+require "dependabot/pub/helpers"
+require "webrick"
+
+RSpec.describe "Helpers" do
+  before(:all) do
+    # Because we do the networking in infer_sdk_versions we have to run an
+    # actual web server.
+    dev_null = WEBrick::Log.new("/dev/null", 7)
+    @server = WEBrick::HTTPServer.new({ Port: 0, AccessLog: [], Logger: dev_null })
+    Thread.new do
+      @server.start
+    end
+  end
+
+  after(:all) do
+    @server.shutdown
+  end
+
+  before do
+    @server.mount_proc "/flutter_releases.json" do |_req, res|
+      res.body = File.read(File.join(__dir__, "..", "..", "fixtures", "flutter_releases.json"))
+    end
+  end
+
+  let(:inferred_result) do
+    Dir.chdir File.join("spec", "fixtures", "projects", project) do
+      Dependabot::Pub::Helpers.run_infer_sdk_versions url: "http://localhost:#{@server[:Port]}/flutter_releases.json"
+    end
+  end
+
+  describe "Will resolve to latest beta if needed" do
+    let(:project) { "requires_latest_beta" }
+    it "Finds a matching beta" do
+      expect(inferred_result["flutter"]).to eq "3.1.0"
+      expect(inferred_result["channel"]).to eq "beta"
+    end
+  end
+
+  describe "pinned on a beta-release" do
+    let(:project) { "requires_old_beta" }
+    it "Finds a matching beta" do
+      expect(inferred_result["flutter"]).to eq "2.13.0-0.4.pre"
+      expect(inferred_result["channel"]).to eq "beta"
+    end
+  end
+
+  describe "Uses newest stable if allowed" do
+    let(:project) { "allows_latest_stable" }
+    it "Finds a matching beta" do
+      expect(inferred_result["flutter"]).to eq "3.0.1"
+      expect(inferred_result["channel"]).to eq "stable"
+    end
+  end
+
+  describe "The dart constraint is taken into account" do
+    let(:project) { "requires_dart_2_15" }
+    it "Finds a matching beta" do
+      expect(inferred_result["dart"]).to eq "2.15.1"
+      expect(inferred_result["channel"]).to eq "stable"
+    end
+  end
+end
diff --git a/pub/spec/dependabot/pub/update_checker_spec.rb b/pub/spec/dependabot/pub/update_checker_spec.rb
index 3ba5289421a..9144b0107e5 100644
--- a/pub/spec/dependabot/pub/update_checker_spec.rb
+++ b/pub/spec/dependabot/pub/update_checker_spec.rb
@@ -32,6 +32,9 @@
         res.body = File.read(File.join("..", "..", f))
       end
     end
+    @server.mount_proc "/flutter_releases.json" do |_req, res|
+      res.body = File.read(File.join(__dir__, "..", "..", "fixtures", "flutter_releases.json"))
+    end
   end
 
   after do
@@ -56,7 +59,8 @@
       }],
       ignored_versions: ignored_versions,
       options: {
-        pub_hosted_url: "http://localhost:#{@server[:Port]}"
+        pub_hosted_url: "http://localhost:#{@server[:Port]}",
+        flutter_releases_url: "http://localhost:#{@server[:Port]}/flutter_releases.json"
       },
       raise_on_ignored: raise_on_ignored,
       requirements_update_strategy: requirements_update_strategy
@@ -116,9 +120,9 @@
             }],
             "previous_version" => "1.14.13",
             "requirements" => [{
-              file: "pubspec.yaml", groups: ["direct"], requirement: "^1.15.0", source: nil
+              file: "pubspec.yaml", groups: ["direct"], requirement: "^1.16.0", source: nil
             }],
-            "version" => "1.15.0" }
+            "version" => "1.16.0" }
         ]
       end
     end
@@ -136,9 +140,9 @@
                 # Dependabot lifts this from the original dependency.
                 "previous_version" => "0.0.0",
                 "requirements" => [{
-                  file: "pubspec.yaml", groups: ["direct"], requirement: "^1.15.0", source: nil
+                  file: "pubspec.yaml", groups: ["direct"], requirement: "^1.16.0", source: nil
                 }],
-                "version" => "1.15.0" }
+                "version" => "1.16.0" }
             ]
           end
         end
@@ -156,7 +160,7 @@
                 "requirements" => [{
                   file: "pubspec.yaml", groups: ["direct"], requirement: "^1.14.13", source: nil
                 }],
-                "version" => "1.15.0" }
+                "version" => "1.16.0" }
             ]
           end
         end
@@ -172,9 +176,9 @@
               # Dependabot lifts this from the original dependency.
               "previous_version" => "0.0.0",
               "requirements" => [{
-                file: "pubspec.yaml", groups: ["direct"], requirement: "^1.15.0", source: nil
+                file: "pubspec.yaml", groups: ["direct"], requirement: "^1.16.0", source: nil
               }],
-              "version" => "1.15.0" }
+              "version" => "1.16.0" }
           ]
         end
       end
@@ -191,7 +195,7 @@
               "requirements" => [{
                 file: "pubspec.yaml", groups: ["direct"], requirement: "^1.14.13", source: nil
               }],
-              "version" => "1.15.0" }
+              "version" => "1.16.0" }
           ]
         end
       end
@@ -209,7 +213,7 @@
                 # No widening needed for this update.
                 file: "pubspec.yaml", groups: ["direct"], requirement: "^1.14.13", source: nil
               }],
-              "version" => "1.15.0" }
+              "version" => "1.16.0" }
           ]
         end
       end
@@ -226,14 +230,14 @@
             # Dependabot lifts this from the original dependency.
             "previous_version" => "0.0.0",
             "requirements" => [],
-            "version" => "1.15.0" }
+            "version" => "1.16.0" }
         ]
       end
     end
 
     context "will not upgrade to ignored version" do
       let(:requirements_to_unlock) { :none }
-      let(:ignored_versions) { ["1.15.0"] }
+      let(:ignored_versions) { ["1.16.0"] }
       it "cannot update" do
         expect(can_update).to be_falsey
       end
@@ -561,4 +565,27 @@
       ]
     end
   end
+
+  context "works for a flutter project" do
+    include_context :uses_temp_dir
+
+    let(:project) { "requires_flutter" }
+    let(:requirements_to_unlock) { :all }
+    let(:dependency_name) { "retry" }
+    it "can update" do
+      expect(can_update).to be_truthy
+      expect(updated_dependencies).to eq [
+        { "name" => "retry",
+          "package_manager" => "pub",
+          "previous_requirements" => [{
+            file: "pubspec.yaml", groups: ["direct"], requirement: "^2.0.0", source: nil
+          }],
+          "previous_version" => "2.0.0",
+          "requirements" => [{
+            file: "pubspec.yaml", groups: ["direct"], requirement: "^3.1.0", source: nil
+          }],
+          "version" => "3.1.0" }
+      ]
+    end
+  end
 end
diff --git a/pub/spec/fixtures/flutter_releases.json b/pub/spec/fixtures/flutter_releases.json
new file mode 100644
index 00000000000..555378a0933
--- /dev/null
+++ b/pub/spec/fixtures/flutter_releases.json
@@ -0,0 +1,3984 @@
+{
+    "base_url": "https://storage.googleapis.com/flutter_infra_release/releases",
+    "current_release": {
+        "beta": "bcea432bce54a83306b3c00a7ad0ed98f777348d",
+        "dev": "13a2fb10b838971ce211230f8ffdd094c14af02c",
+        "stable": "fb57da5f945d02ef4f98dfd9409a72b7cce74268"
+    },
+    "releases": [
+        {
+            "hash": "bcea432bce54a83306b3c00a7ad0ed98f777348d",
+            "channel": "beta",
+            "version": "3.1.0",
+            "dart_sdk_version": "2.18.0 (build 2.18.0-44.1.beta)",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-05-26T18:09:48.638565Z",
+            "archive": "beta/linux/flutter_linux_3.1.0-beta.tar.xz",
+            "sha256": "b31f03f07c10f8dd4a87324fbe91f700027f256efb0d1d3306389acc560c9883"
+        },
+        {
+            "hash": "fb57da5f945d02ef4f98dfd9409a72b7cce74268",
+            "channel": "stable",
+            "version": "3.0.1",
+            "dart_sdk_version": "2.17.1",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-05-20T03:45:16.909313Z",
+            "archive": "stable/linux/flutter_linux_3.0.1-stable.tar.xz",
+            "sha256": "fe088c6c399d3bf6958171cec1dfdb387bacb1b643413fa07e6c353fad80adc1"
+        },
+        {
+            "hash": "ee4e09cce01d6f2d7f4baebd247fde02e5008851",
+            "channel": "stable",
+            "version": "3.0.0",
+            "dart_sdk_version": "2.17.0",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-05-11T18:55:24.142977Z",
+            "archive": "stable/linux/flutter_linux_3.0.0-stable.tar.xz",
+            "sha256": "e96d75ec8e7dc2a46bc8dad5a9e01c391ab9310ad01c4e3940c963dd263788a0"
+        },
+        {
+            "hash": "25caf1461b8f643092a9f6f5b224453b5c057d10",
+            "channel": "beta",
+            "version": "2.13.0-0.4.pre",
+            "dart_sdk_version": "2.17.0 (build 2.17.0-266.8.beta)",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-05-05T21:48:01.989568Z",
+            "archive": "beta/linux/flutter_linux_2.13.0-0.4.pre-beta.tar.xz",
+            "sha256": "e723696f142c764805ccb890b390ee8b543918780cb92e3da06f8cbdcfd292d3"
+        },
+        {
+            "hash": "5293f3cd4427b4b48ed155e7a3852c6b3c53d94a",
+            "channel": "beta",
+            "version": "2.13.0-0.3.pre",
+            "dart_sdk_version": "2.17.0 (build 2.17.0-266.7.beta)",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-04-27T22:49:11.654128Z",
+            "archive": "beta/linux/flutter_linux_2.13.0-0.3.pre-beta.tar.xz",
+            "sha256": "490a862067647ca03b6ece064b3f78a5b129c2ca858381b8fce013b65d083566"
+        },
+        {
+            "hash": "8662e22bac54c71bc4fa5a4f37e9ee80bfd08a4e",
+            "channel": "beta",
+            "version": "2.13.0-0.2.pre",
+            "dart_sdk_version": "2.17.0 (build 2.17.0-266.5.beta)",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-04-20T17:54:05.435804Z",
+            "archive": "beta/linux/flutter_linux_2.13.0-0.2.pre-beta.tar.xz",
+            "sha256": "324d5eecae6fd0402140c34aa905e33efbc2a16342d76b1275b17ccc37a470df"
+        },
+        {
+            "hash": "5464c5bac742001448fe4fc0597be939379f88ea",
+            "channel": "stable",
+            "version": "2.10.5",
+            "dart_sdk_version": "2.16.2",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-04-18T19:39:16.376216Z",
+            "archive": "stable/linux/flutter_linux_2.10.5-stable.tar.xz",
+            "sha256": "0d3670c65314624f0d4b549a5942689578c3f899d15bbdcfb3909d4470c69edd"
+        },
+        {
+            "hash": "13a2fb10b838971ce211230f8ffdd094c14af02c",
+            "channel": "beta",
+            "version": "2.13.0-0.1.pre",
+            "dart_sdk_version": "2.17.0 (build 2.17.0-266.1.beta)",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-04-13T19:01:07.412476Z",
+            "archive": "beta/linux/flutter_linux_2.13.0-0.1.pre-beta.tar.xz",
+            "sha256": "d89a4a0536b5ce4a5d77552e5df28169706bf19f923650f310d77ddac8852f44"
+        },
+        {
+            "hash": "13a2fb10b838971ce211230f8ffdd094c14af02c",
+            "channel": "dev",
+            "version": "2.13.0-0.1.pre",
+            "dart_sdk_version": "2.17.0 (build 2.17.0-266.1.beta)",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-04-13T19:00:17.681606Z",
+            "archive": "dev/linux/flutter_linux_2.13.0-0.1.pre-dev.tar.xz",
+            "sha256": "70d43803e714657677555649b3dc92e2739de1aaf2619c4da3e1efb0d5a5ffd1"
+        },
+        {
+            "hash": "5c931b769b581d536ee5b5d58677d39a110da3d0",
+            "channel": "beta",
+            "version": "2.12.0-4.2.pre",
+            "dart_sdk_version": "2.17.0 (build 2.17.0-182.2.beta)",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-04-06T00:18:33.863902Z",
+            "archive": "beta/linux/flutter_linux_2.12.0-4.2.pre-beta.tar.xz",
+            "sha256": "62febf5b0a02c7a89ee123591c6cabe6feb4c022681f64647ea8bae2b86c8207"
+        },
+        {
+            "hash": "c860cba910319332564e1e9d470a17074c1f2dfd",
+            "channel": "stable",
+            "version": "2.10.4",
+            "dart_sdk_version": "2.16.2",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-03-28T16:58:30.367026Z",
+            "archive": "stable/linux/flutter_linux_2.10.4-stable.tar.xz",
+            "sha256": "7ad769690f1a0fd1e432c7d4c265eba946237aa94241de5b53f92ff31ddc82d2"
+        },
+        {
+            "hash": "680962aa75a3c0ea8a55c57adc98944f5558bafd",
+            "channel": "beta",
+            "version": "2.12.0-4.1.pre",
+            "dart_sdk_version": "2.17.0 (build 2.17.0-182.1.beta)",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-03-17T23:45:13.673618Z",
+            "archive": "beta/linux/flutter_linux_2.12.0-4.1.pre-beta.tar.xz",
+            "sha256": "20e47459bcaade0d9bb850e30fc3525bb48183e32819ec85f244d99ce4e0b9be"
+        },
+        {
+            "hash": "7e9793dee1b85a243edd0e06cb1658e98b077561",
+            "channel": "stable",
+            "version": "2.10.3",
+            "dart_sdk_version": "2.16.1",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-03-03T02:51:02.356833Z",
+            "archive": "stable/linux/flutter_linux_2.10.3-stable.tar.xz",
+            "sha256": "7e2a28d14d7356a5bbfe516f8a7c9fc0353f85fe69e5cf6af22be2c7c8b45566"
+        },
+        {
+            "hash": "097d3313d8e2c7f901932d63e537c1acefb87800",
+            "channel": "stable",
+            "version": "2.10.2",
+            "dart_sdk_version": "2.16.1",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-02-19T04:37:38.591434Z",
+            "archive": "stable/linux/flutter_linux_2.10.2-stable.tar.xz",
+            "sha256": "03de160d1c30730a248cb5e168ec2de60f883d7e365e6cf57b27786e85436c0f"
+        },
+        {
+            "hash": "b101bfe32f634566e7cb2791a9efe19cf8828b15",
+            "channel": "beta",
+            "version": "2.11.0-0.1.pre",
+            "dart_sdk_version": "2.17.0 (build 2.17.0-69.2.beta)",
+            "dart_sdk_arch": "x64",
+            "release_date": "2022-02-16T18:34:51.633640Z",
+            "archive": "beta/linux/flutter_linux_2.11.0-0.1.pre-beta.tar.xz",
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+            "sha256": "0184236517aca16387698c122d20b750dbfa5fd8966d9e864b67675ec18a8c84"
+        },
+        {
+            "hash": "b397406561f5e7a9c94e28f58d9e49fca0dd58b7",
+            "channel": "beta",
+            "version": "v0.2.8",
+            "release_date": "2018-04-09T18:34:23.057146Z",
+            "archive": "beta/linux/flutter_linux_v0.2.8-beta.tar.xz",
+            "sha256": "97725c50e795498d2d7e9796ed9ee45d4039dec5cae81ee88f65c4cf6c6045c8"
+        },
+        {
+            "hash": "487e6bc91efd3b8ef859a31963b26e19d12ca6fa",
+            "channel": "dev",
+            "version": "v0.2.9",
+            "release_date": "2018-04-05T15:46:23.078195Z",
+            "archive": "dev/linux/flutter_linux_v0.2.9-dev.tar.xz",
+            "sha256": "99ebcc35e3359c79abc015124f109a1b86f69de0e5fe7fe631d42eea34b39eb9"
+        },
+        {
+            "hash": "b397406561f5e7a9c94e28f58d9e49fca0dd58b7",
+            "channel": "dev",
+            "version": "v0.2.8",
+            "release_date": "2018-04-03T01:46:58.039956Z",
+            "archive": "dev/linux/flutter_linux_v0.2.8-dev.tar.xz",
+            "sha256": "ba30a280209ab95d906eda647e2bb17b6a786279a1e3e4cffeb73b7bf0172d63"
+        },
+        {
+            "hash": "5a58b36e36b8d7aace89d3950e6deb307956a6a0",
+            "channel": "beta",
+            "version": "v0.2.3",
+            "release_date": "2018-04-02T23:23:50.189137Z",
+            "archive": "beta/linux/flutter_linux_v0.2.3-beta.tar.xz",
+            "sha256": "4fe85a822093e81cb5a66c7fc263f68de39b5797b294191b6d75e7afcc86aff8"
+        },
+        {
+            "hash": "0c89920069320b75d1fa4a47d36b2c48cf85697c",
+            "channel": "dev",
+            "version": "v0.2.7",
+            "release_date": "2018-04-02T23:11:51.217078Z",
+            "archive": "dev/linux/flutter_linux_v0.2.7-dev.tar.xz",
+            "sha256": "1092f0a13bbea5524f9cb4d476384db98a4aef9daad6396d98dc66b4afac4d12"
+        },
+        {
+            "hash": "1d067220daa06be91956de1130d93e63fb2f1a5a",
+            "channel": "dev",
+            "version": "v0.2.6",
+            "release_date": "2018-03-30T13:56:17.652025Z",
+            "archive": "dev/linux/flutter_linux_v0.2.6-dev.tar.xz",
+            "sha256": "4caeb9af0ac3c251b7d02ec418808e7a274e9d089426a33478b4e50fe2b22fdb"
+        },
+        {
+            "hash": "bffae2157102dd75a625153d3dc866d3de69c853",
+            "channel": "dev",
+            "version": "v0.2.5",
+            "release_date": "2018-03-30T01:48:38.085191Z",
+            "archive": "dev/linux/flutter_linux_v0.2.5-dev.tar.xz",
+            "sha256": "f0ffdd05349842cc8e31d18e6786143a5a3dfcc7a993042e3f9e08dbd7512b5c"
+        },
+        {
+            "hash": "3352a3fb488df4742ff323243d3dc44d9b7cd3e8",
+            "channel": "dev",
+            "version": "v0.2.4",
+            "release_date": "2018-03-26T20:43:01.049354Z",
+            "archive": "dev/linux/flutter_linux_v0.2.4-dev.tar.xz",
+            "sha256": "f4d7aae23436505d1826d174a37658209dc3057a8deff417ab93c886f798b972"
+        },
+        {
+            "hash": "5a58b36e36b8d7aace89d3950e6deb307956a6a0",
+            "channel": "dev",
+            "version": "v0.2.3",
+            "release_date": "2018-03-20T01:47:02.851729Z",
+            "archive": "dev/linux/flutter_linux_v0.2.3-dev.tar.xz",
+            "sha256": "20705630ad9963aa8dca62a5dc8f33264e4cbe6735f5697e77d4a2075c019a1d"
+        },
+        {
+            "hash": "b9bd51cc36b706215915711e580851901faebb40",
+            "channel": "dev",
+            "version": "v0.2.2",
+            "release_date": "2018-03-16T18:48:13.375013Z",
+            "archive": "dev/linux/flutter_linux_v0.2.2-dev.tar.xz",
+            "sha256": "6073331168cdb37a4637a5dc073d6a7ef4e466321effa2c529fa27d2253a4d4b"
+        },
+        {
+            "hash": "3ea4d06340a97a1e9d7cae97567c64e0569dcaa2",
+            "channel": "beta",
+            "version": "v0.1.5",
+            "release_date": "2018-03-15T16:54:36.795002Z",
+            "archive": "beta/linux/flutter_linux_v0.1.5-beta.tar.xz",
+            "sha256": "d3be599c0a2367a0c38c496a0ed474fa619957022a95d4e9d8b06b1bede2f105"
+        },
+        {
+            "hash": "6f5bcb97a43e45b302b6b8d9eb5ef9d54f09515e",
+            "channel": "dev",
+            "version": "v0.2.1",
+            "release_date": "2018-03-12T17:08:21.387382Z",
+            "archive": "dev/linux/flutter_linux_v0.2.1-dev.tar.xz",
+            "sha256": "a9d370d8a76ccae4cb74458bd95027380c3cc3d034fc267513d89fe153fdc33d"
+        },
+        {
+            "hash": "f8ac23cd8646538634f63032df4bfaf3b597007d",
+            "channel": "dev",
+            "version": "v0.2.0",
+            "release_date": "2018-03-07T19:43:29.371633Z",
+            "archive": "dev/linux/flutter_linux_v0.2.0-dev.tar.xz",
+            "sha256": "2d18e27823ac46d0664fe7a8c2e7944ae03b965868c962194eec312e5b6a995d"
+        },
+        {
+            "hash": "70f60b17d7de9844c356fb7ab0e2cf1630a70965",
+            "channel": "dev",
+            "version": "v0.1.9",
+            "release_date": "2018-03-07T05:33:37.499761Z",
+            "archive": "dev/linux/flutter_linux_v0.1.9-dev.tar.xz",
+            "sha256": "1a843c6c3b960871385274573d988f6c842147deadfde08b3c9ce8e2061919c5"
+        },
+        {
+            "hash": "6993b203c05477fec537f566be7ff7fbf072d33b",
+            "channel": "dev",
+            "version": "v0.1.8",
+            "release_date": "2018-03-06T08:16:53.944971Z",
+            "archive": "dev/linux/flutter_linux_v0.1.8-dev.tar.xz",
+            "sha256": "30d70d9b8e60d1fe08420718842995b566c045720eaabbd0452669edb3270b01"
+        },
+        {
+            "hash": "1f3eb5034ff2372956620b2a9eb88683eee9495e",
+            "channel": "dev",
+            "version": "v0.1.6",
+            "release_date": "2018-02-27T00:26:37.058993Z",
+            "archive": "dev/linux/flutter_linux_v0.1.6-dev.tar.xz",
+            "sha256": "5dd34873b3a3e214a32fd30c2c319a0f46e608afb72f0d450b2d621a6d02aebd"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/pub/spec/fixtures/projects/allows_latest_stable/pubspec.yaml b/pub/spec/fixtures/projects/allows_latest_stable/pubspec.yaml
new file mode 100644
index 00000000000..ecfe5b12169
--- /dev/null
+++ b/pub/spec/fixtures/projects/allows_latest_stable/pubspec.yaml
@@ -0,0 +1,4 @@
+name: foo
+environment:
+  flutter: '>=2.0.0'
+  dart: '>= 2.12.0 <3.0.0'
diff --git a/pub/spec/fixtures/projects/requires_dart_2_15/pubspec.yaml b/pub/spec/fixtures/projects/requires_dart_2_15/pubspec.yaml
new file mode 100644
index 00000000000..c278d57c176
--- /dev/null
+++ b/pub/spec/fixtures/projects/requires_dart_2_15/pubspec.yaml
@@ -0,0 +1,3 @@
+name: foo
+environment:
+  sdk: '>= 2.15.0 <2.16.0'
diff --git a/pub/spec/fixtures/projects/requires_flutter/pubspec.lock b/pub/spec/fixtures/projects/requires_flutter/pubspec.lock
new file mode 100644
index 00000000000..26565528036
--- /dev/null
+++ b/pub/spec/fixtures/projects/requires_flutter/pubspec.lock
@@ -0,0 +1,58 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.16.0"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.4"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.0"
+  retry:
+    dependency: "direct main"
+    description:
+      name: retry
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.2"
+sdks:
+  dart: ">=2.14.0 <3.0.0"
+  flutter: ">=2.13.0"
diff --git a/pub/spec/fixtures/projects/requires_flutter/pubspec.yaml b/pub/spec/fixtures/projects/requires_flutter/pubspec.yaml
new file mode 100644
index 00000000000..7a41584eb03
--- /dev/null
+++ b/pub/spec/fixtures/projects/requires_flutter/pubspec.yaml
@@ -0,0 +1,9 @@
+name: foo
+environment:
+  flutter: '>= 2.13.0'
+  sdk: '>= 2.12.0 <3.0.0'
+
+dependencies:
+  retry: ^2.0.0
+  flutter:
+    sdk: flutter
\ No newline at end of file
diff --git a/pub/spec/fixtures/projects/requires_latest_beta/pubspec.yaml b/pub/spec/fixtures/projects/requires_latest_beta/pubspec.yaml
new file mode 100644
index 00000000000..8eba669b2e8
--- /dev/null
+++ b/pub/spec/fixtures/projects/requires_latest_beta/pubspec.yaml
@@ -0,0 +1,4 @@
+name: foo
+environment:
+  flutter: '>=3.1.0'
+  dart: '>= 2.17.0 <3.0.0'
diff --git a/pub/spec/fixtures/projects/requires_old_beta/pubspec.yaml b/pub/spec/fixtures/projects/requires_old_beta/pubspec.yaml
new file mode 100644
index 00000000000..61a16627216
--- /dev/null
+++ b/pub/spec/fixtures/projects/requires_old_beta/pubspec.yaml
@@ -0,0 +1,4 @@
+name: foo
+environment:
+  flutter: 2.13.0-0.4.pre
+  dart: '>= 2.12.0 <3.0.0'
diff --git a/pub/spec/fixtures/pub_dev_responses/simple/README.md b/pub/spec/fixtures/pub_dev_responses/simple/README.md
index ac5cb0766a0..5c9d839d0d5 100644
--- a/pub/spec/fixtures/pub_dev_responses/simple/README.md
+++ b/pub/spec/fixtures/pub_dev_responses/simple/README.md
@@ -2,7 +2,7 @@ Responses from the pub.dev website.
 
 These can be regenerated with:
 ```bash
-for package in cli_util protobuf fixnum path retry; do
+for package in vector_math meta material_color_utilities collection characters; do
   curl --compressed https://pub.dev/api/packages/$package > pub/spec/fixtures/pub_dev_responses/simple/$package.json
-done 
+done
 ```
diff --git a/pub/spec/fixtures/pub_dev_responses/simple/characters.json b/pub/spec/fixtures/pub_dev_responses/simple/characters.json
new file mode 100644
index 00000000000..e461e335f6b
--- /dev/null
+++ b/pub/spec/fixtures/pub_dev_responses/simple/characters.json
@@ -0,0 +1 @@
+{"name":"characters","latest":{"version":"1.2.1","pubspec":{"name":"characters","version":"1.2.1","description":"String replacement with operations that are Unicode/grapheme cluster aware.","repository":"https://github.com/dart-lang/characters","environment":{"sdk":">=2.12.0 <3.0.0"},"dev_dependencies":{"lints":"^1.0.0","test":"^1.16.0"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.2.1.tar.gz","published":"2022-05-04T16:47:08.918941Z"},"versions":[{"version":"0.3.0","pubspec":{"version":"0.3.0","name":"characters","author":"Dart Team <misc@dartlang.org>","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.5.0 <3.0.0"},"dev_dependencies":{"test":"^1.6.0"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/0.3.0.tar.gz","published":"2019-10-22T14:41:52.158371Z"},{"version":"0.3.1","pubspec":{"version":"0.3.1","name":"characters","author":"Dart Team <misc@dartlang.org>","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.5.0 <3.0.0"},"dev_dependencies":{"test":"^1.6.0","pedantic":null}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/0.3.1.tar.gz","published":"2019-10-25T12:36:45.024759Z"},{"version":"0.4.0","pubspec":{"name":"characters","version":"0.4.0","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.6.0 <3.0.0"},"dev_dependencies":{"test":"^1.6.0","pedantic":null}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/0.4.0.tar.gz","published":"2019-11-13T12:54:17.392008Z"},{"version":"0.5.0","pubspec":{"name":"characters","version":"0.5.0","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.6.0 <3.0.0"},"dev_dependencies":{"test":"^1.6.0","pedantic":null}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/0.5.0.tar.gz","published":"2019-12-05T13:35:18.391622Z"},{"version":"1.0.0","pubspec":{"name":"characters","version":"1.0.0","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.6.0 <3.0.0"},"dev_dependencies":{"test":"^1.6.0","pedantic":"^1.9.0"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.0.0.tar.gz","published":"2020-06-09T17:50:33.250666Z"},{"version":"1.1.0-nullsafety","pubspec":{"name":"characters","version":"1.1.0-nullsafety","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.9.0-18.0 <2.9.0"},"dev_dependencies":{"test":"^1.6.0","pedantic":"^1.9.0"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.1.0-nullsafety.tar.gz","published":"2020-07-08T19:57:37.041999Z"},{"version":"1.1.0-nullsafety.1","pubspec":{"name":"characters","version":"1.1.0-nullsafety.1","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.9.0-18.0 <=2.9.10"},"dev_dependencies":{"test":"^1.6.0","pedantic":"^1.9.0"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.1.0-nullsafety.1.tar.gz","published":"2020-07-17T16:46:45.923744Z"},{"version":"1.1.0-nullsafety.2","pubspec":{"name":"characters","version":"1.1.0-nullsafety.2","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.10.0-0 <2.10.0"},"dev_dependencies":{"test":"^1.6.0","pedantic":"^1.9.0"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.1.0-nullsafety.2.tar.gz","published":"2020-07-22T14:25:10.648861Z"},{"version":"1.1.0-nullsafety.3","pubspec":{"name":"characters","version":"1.1.0-nullsafety.3","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.10.0-110 <2.11.0"},"dev_dependencies":{"test":"^1.6.0","pedantic":"^1.9.0"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.1.0-nullsafety.3.tar.gz","published":"2020-09-22T17:09:44.119944Z"},{"version":"1.1.0-nullsafety.4","pubspec":{"name":"characters","version":"1.1.0-nullsafety.4","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.10.0-110 <2.12.0"},"dev_dependencies":{"test":"^1.16.0-nullsafety","pedantic":"^1.10.0-nullsafety"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.1.0-nullsafety.4.tar.gz","published":"2020-10-22T17:00:58.426891Z"},{"version":"1.1.0-nullsafety.5","pubspec":{"name":"characters","version":"1.1.0-nullsafety.5","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.12.0-0 <3.0.0"},"dev_dependencies":{"test":"^1.16.0-nullsafety","pedantic":"^1.10.0-nullsafety"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.1.0-nullsafety.5.tar.gz","published":"2020-11-03T19:13:11.247298Z"},{"version":"1.1.0","pubspec":{"name":"characters","version":"1.1.0","description":"String replacement with operations that are Unicode/grapheme cluster aware.","homepage":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.12.0-0 <3.0.0"},"dev_dependencies":{"test":"^1.16.0-nullsafety","pedantic":"^1.10.0-nullsafety"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.1.0.tar.gz","published":"2021-02-02T19:38:26.068937Z"},{"version":"1.2.0","pubspec":{"name":"characters","version":"1.2.0","description":"String replacement with operations that are Unicode/grapheme cluster aware.","repository":"https://www.github.com/dart-lang/characters","environment":{"sdk":">=2.12.0 <3.0.0"},"dev_dependencies":{"test":"^1.16.0","lints":"^1.0.0"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.2.0.tar.gz","published":"2021-09-13T12:49:07.342790Z"},{"version":"1.2.1","pubspec":{"name":"characters","version":"1.2.1","description":"String replacement with operations that are Unicode/grapheme cluster aware.","repository":"https://github.com/dart-lang/characters","environment":{"sdk":">=2.12.0 <3.0.0"},"dev_dependencies":{"lints":"^1.0.0","test":"^1.16.0"}},"archive_url":"https://pub.dartlang.org/packages/characters/versions/1.2.1.tar.gz","published":"2022-05-04T16:47:08.918941Z"}]}
\ No newline at end of file
diff --git a/pub/spec/fixtures/pub_dev_responses/simple/collection.json b/pub/spec/fixtures/pub_dev_responses/simple/collection.json
index 2bccc214358..31f9a95589b 100644
--- a/pub/spec/fixtures/pub_dev_responses/simple/collection.json
+++ b/pub/spec/fixtures/pub_dev_responses/simple/collection.json
@@ -1 +1 @@
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diff --git a/pub/spec/fixtures/pub_dev_responses/simple/material_color_utilities.json b/pub/spec/fixtures/pub_dev_responses/simple/material_color_utilities.json
new file mode 100644
index 00000000000..81ae9d43410
--- /dev/null
+++ b/pub/spec/fixtures/pub_dev_responses/simple/material_color_utilities.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/pub/spec/fixtures/pub_dev_responses/simple/vector_math.json b/pub/spec/fixtures/pub_dev_responses/simple/vector_math.json
new file mode 100644
index 00000000000..47287750952
--- /dev/null
+++ b/pub/spec/fixtures/pub_dev_responses/simple/vector_math.json
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