diff --git a/.circleci/config.yml b/.circleci/config.yml
index c3411c8..69382d0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,27 +1,180 @@
-version: 2.0
-jobs:
-  build:
-    environment:
-      CC_TEST_REPORTER_ID: 8ec926841c6dfead9c848fd063c569e11b06be11442a8175d588e10607ee2150
-      XDEBUG_MODE: coverage
-    docker:
-      - image: circleci/php:7-cli-node-browsers-legacy
-    working_directory: ~/repo
+# PHPUnit Composer min/max test.
+# TODO: Make our own orb out of this.
+
+version: 2.1
+orbs:
+  php: circleci/php@1.1.0
+
+commands:
+  update-packages:
+    description: |
+      Update your composer packages with automated caching and best practices applied.
+    parameters:
+      app-dir:
+        default: ~/project
+        description: Path to the directory containing your composer.json file. Not needed if composer.json lives in the root.
+        type: string
+      cache-files-dir:
+        default: /home/circleci/.composer/cache/files
+        description: Absolute path to the file cache folder. This should be inline with "composer global config cache-files-dir --absolute".
+        type: string
+      cache-key:
+        default: composer.lock
+        description: If this file is updated a new cache bucket will be created. Recommended to use composer.lock. Use composer.json when composer.lock is absent.
+        type: string
+      cache-version:
+        default: v1
+        description: Change the default cache version if you need to clear the cache for any reason.
+        type: string
+      install-flags:
+        default: --no-interaction --prefer-dist
+        description: |
+          By default, packages will be installed with "composer install --no-interaction --prefer-dist", use this to override the standard install flags.
+        type: string
+      vendor-dir:
+        default: vendor
+        description: Relative path to the vendor folder. Relative to "app-dir". This should be inline with "composer config vendor-dir".
+        type: string
+      with-cache:
+        default: true
+        description: Enable automatic caching of your dependencies for increased speed.
+        type: boolean
     steps:
-      - checkout
+      - when:
+          condition: << parameters.with-cache >>
+          steps:
+            - restore_cache:
+                keys:
+                  - composer-deps-<<parameters.cache-version>>-{{ checksum "<<parameters.app-dir>>/<<parameters.cache-key>>" }}
       - run:
-          name: Setup dependencies
           command: |
-            sudo composer self-update
-            composer install -n --prefer-dist
+            if [ ! -f "composer.json" ] && [ ! -f "composer.lock" ]; then
+              echo
+              echo "---"
+              echo "Unable to find your composer.json and composer.lock files. Did you forget to set the app-dir parameter?"
+              echo "---"
+              echo
+              echo "Current directory: $(pwd)"
+              echo
+              echo
+              echo "List directory: "
+              echo
+              ls
+              exit 1
+            fi
+          name: Verify composer.json and/or composer.lock exist
+          working_directory: <<parameters.app-dir>>
+      - run:
+          command: composer update <<parameters.install-flags>>
+          name: Updating Composer Packages
+          working_directory: <<parameters.app-dir>>
+      - when:
+          condition: << parameters.with-cache >>
+          steps:
+            - save_cache:
+                key: composer-deps-<<parameters.cache-version>>-{{ checksum "<<parameters.app-dir>>/<<parameters.cache-key>>" }}
+                paths:
+                  - <<parameters.app-dir>>/<<parameters.vendor-dir>>
+                  - <<parameters.cache-files-dir>>
+  install-xdebug:
+    steps:
+      - run:
+          name: Install XDebug
+          command: sudo -E install-php-extensions xdebug && sudo -E docker-php-ext-enable xdebug
+
+  install-cc-test-reporter:
+    # TODO: Parameterize location.
+    steps:
       - run:
-          name: Setup Code Climate test-reporter
+          name: Install Codeclimate test reporter
           command: |
             curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
             chmod +x ./cc-test-reporter
-      - run:
-          name: Run tests
-          command: |
-            ./cc-test-reporter before-build
-            vendor/bin/phpunit --testsuite all --coverage-clover clover.xml
-            ./cc-test-reporter after-build --coverage-input-type clover --exit-code $?
+
+  run-phpunit-tests:
+    description: |
+      Run PHPUnit tests.
+    parameters:
+      app-dir:
+        default: ~/project
+        description: Path to the directory containing your composer.json file. Not needed if composer.json lives in the root.
+        type: string
+      install-flags:
+        default: ""
+        description: Arguments to `composer update`.
+        type: string
+      test-command:
+        default: test
+        description: The name of the script within your composer.json which will run your tests.
+        type: string
+      report-to-codeclimate:
+        type: boolean
+        default: false
+        description: Report coverage info to Codeclimate.
+    steps:
+      - checkout
+      - update-packages:
+          app-dir: <<parameters.app-dir>>
+          cache-key: composer.json
+          install-flags: <<parameters.install-flags>>
+      - when:
+          condition: <<parameters.report-to-codeclimate>>
+          steps:
+            - install-xdebug
+            - install-cc-test-reporter
+            - run: |
+                ./cc-test-reporter before-build
+                XDEBUG_MODE=coverage composer <<parameters.test-command>> -- --coverage-clover clover.xml
+                ./cc-test-reporter after-build --coverage-input-type clover --exit-code $?
+      - when:
+          condition:
+            not: <<parameters.report-to-codeclimate>>
+          steps:
+            - run: |
+                XDEBUG_MODE=off composer <<parameters.test-command>>
+
+jobs:
+  matrix-conditions:
+    environment:
+      CC_TEST_REPORTER_ID: 8ec926841c6dfead9c848fd063c569e11b06be11442a8175d588e10607ee2150
+    description: Run tests for matrix
+    executor:
+      name: php/default
+      tag: << parameters.version >>
+    parameters:
+      version:
+        default: "7.4"
+        description: The `cimg/php` Docker image version tag.
+        type: string
+      install-flags:
+        default: ""
+        description: Arguments to `composer update`.
+        type: string
+    steps:
+      - when:
+          condition:
+            and:
+              - equal: [ "8.1", <<parameters.version>> ]
+              - equal: [ "", <<parameters.install-flags>> ]
+          steps:
+            - run-phpunit-tests:
+                report-to-codeclimate: true
+                install-flags: << parameters.install-flags >>
+      - when:
+          condition:
+            not:
+              and:
+                - equal: [ "8.1", <<parameters.version>> ]
+                - equal: [ "", <<parameters.install-flags>> ]
+          steps:
+            - run-phpunit-tests:
+                install-flags: << parameters.install-flags >>
+
+workflows:
+  all-tests:
+    jobs:
+      - matrix-conditions:
+          matrix:
+            parameters:
+              version: ["7.4", "8.0", "8.1"]
+              install-flags: ["", "--prefer-lowest"]
diff --git a/.gitignore b/.gitignore
index 13a6327..1952f1d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,6 @@
 vendor/
 .phpunit*
 .vscode/
-/.idea/codeStyles/codeStyleConfig.xml
 /composer.lock
-/.idea/modules.xml
-/.idea/php.xml
-/.idea/RootedJsonData.iml
-/.idea/vcs.xml
-/.idea/workspace.xml
+.idea
+.ddev
\ No newline at end of file
diff --git a/README.md b/README.md
index 6531c6e..9c393c0 100644
--- a/README.md
+++ b/README.md
@@ -16,4 +16,4 @@ echo $data->{"$.number"}; // 3
 echo $data->{"$[number]"}; // 3
 echo "{$data}"; // {"number":3}
 $data->{"$.number"} = "three"; // EXCEPTION
-```
+```
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 2ccaa86..0129825 100644
--- a/composer.json
+++ b/composer.json
@@ -1,31 +1,43 @@
 {
     "name": "getdkan/rooted-json-data",
     "description": "Access and modify JSON-based data objects while enforcing JSON Schema",
-    "type": "library",
     "license": "GPL-3.0-or-later",
+    "type": "library",
+    "authors": [
+        {
+            "name": "fmizzell",
+            "email": "fmizzell.dev@gmail.com"
+        },
+        {
+            "name": "Dan Feder",
+            "email": "dafeder@mailbox.org"
+        }
+    ],
     "require": {
-        "opis/json-schema": "^1.0",
+        "ext-json": "*",
         "galbar/jsonpath": "^1.1",
-        "ext-json": "*"
+        "opis/json-schema": "^1.0.8"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.4"
+        "phpunit/phpunit": "^9.4",
+        "rector/rector": "^0.15.19",
+        "squizlabs/php_codesniffer": "^3.7"
     },
     "autoload": {
         "psr-4": {
-            "RootedData\\": "src/",
-            "RootedDataTest\\": "tests/"
+            "RootedData\\": "src/"
         }
     },
-    "authors": [
-        {
-            "name": "fmizzell",
-            "email": "fmizzell.dev@gmail.com"
-        },
-        {
-            "name": "Dan Feder",
-            "email": "dafeder@mailbox.org"
+    "autoload-dev": {
+        "psr-4": {
+            "RootedDataTest\\": "tests/"
         }
-
-    ]
+    },
+    "scripts": {
+        "phpcbf": "./vendor/bin/phpcbf",
+        "phpcs": "./vendor/bin/phpcs",
+        "rector": "./vendor/bin/rector process",
+        "rector-dry-run": "./vendor/bin/rector process --dry-run",
+        "test": "./vendor/bin/phpunit --testsuite all"
+    }
 }
diff --git a/phpcs.xml b/phpcs.xml
new file mode 100644
index 0000000..5c4a459
--- /dev/null
+++ b/phpcs.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ruleset name="getdkan">
+
+    <arg name="extensions" value="inc,install,module,php,profile,test,theme,yml"/>
+    <description>PHP CodeSniffer configuration for GetDKAN.</description>
+
+    <file>src</file>
+    <file>tests</file>
+    <file>rector.php</file>
+
+    <rule ref="PSR1"/>
+    <rule ref="PSR2"/>
+
+</ruleset>
diff --git a/rector.php b/rector.php
new file mode 100644
index 0000000..f36950f
--- /dev/null
+++ b/rector.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\Set\ValueObject\LevelSetList;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->paths([
+    __DIR__ . '/src',
+    __DIR__ . '/tests',
+    ]);
+
+    $rectorConfig->sets([
+    LevelSetList::UP_TO_PHP_74,
+    ]);
+};