diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index da24ad3..d632398 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -4,12 +4,12 @@ on:
   pull_request:
 name: Test
 env:
-  DART_SASS_VERSION: 1.56.1
+  SASS_VERSION: 1.63.2
 jobs:
   test:
     strategy:
       matrix:
-        go-version: [~1.18, ~1.19]
+        go-version: [~1.19, ~1.20]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
@@ -19,24 +19,25 @@ jobs:
         go-version: ${{ matrix.go-version }}
     - name: Checkout code
       uses: actions/checkout@v3
-    - name: Install dart-sass-embedded Linux
+    - name: Install dart-sass Linux
       if: matrix.os == 'ubuntu-latest'
       run: |
-        curl -LJO "https://github.com/sass/dart-sass-embedded/releases/download/${DART_SASS_VERSION}/sass_embedded-${DART_SASS_VERSION}-linux-x64.tar.gz";
-        tar -xvf "sass_embedded-${DART_SASS_VERSION}-linux-x64.tar.gz";
-        echo "DART_SASS_EMBEDDED_BINARY=$GITHUB_WORKSPACE/sass_embedded/dart-sass-embedded" >> $GITHUB_ENV
-    - name: Install dart-sass-embedded MacOS
+        curl -LJO "https://github.com/sass/dart-sass/releases/download/${SASS_VERSION}/dart-sass-${SASS_VERSION}-linux-x64.tar.gz";
+        tar -xvf "dart-sass-${SASS_VERSION}-linux-x64.tar.gz";
+        echo "DART_SASS_BINARY=$GITHUB_WORKSPACE/dart-sass/sass" >> $GITHUB_ENV
+        ./dart-sass/sass --version
+    - name: Install dart-sass MacOS
       if: matrix.os == 'macos-latest'
       run: |
-        curl -LJO "https://github.com/sass/dart-sass-embedded/releases/download/${DART_SASS_VERSION}/sass_embedded-${DART_SASS_VERSION}-macos-x64.tar.gz";
-        tar -xvf "sass_embedded-${DART_SASS_VERSION}-macos-x64.tar.gz";
-        echo "DART_SASS_EMBEDDED_BINARY=$GITHUB_WORKSPACE/sass_embedded/dart-sass-embedded" >> $GITHUB_ENV
-    - name: Install dart-sass-embedded Windows
+        curl -LJO "https://github.com/sass/dart-sass/releases/download/${SASS_VERSION}/dart-sass-${SASS_VERSION}-macos-x64.tar.gz";
+        tar -xvf "dart-sass-${SASS_VERSION}-macos-x64.tar.gz";
+        echo "DART_SASS_BINARY=$GITHUB_WORKSPACE/dart-sass/sass" >> $GITHUB_ENV
+    - name: Install dart-sass Windows
       if: matrix.os == 'windows-latest'
       run: |
-        curl -LJO "https://github.com/sass/dart-sass-embedded/releases/download/${env:DART_SASS_VERSION}/sass_embedded-${env:DART_SASS_VERSION}-windows-x64.zip";
-        Expand-Archive -Path "sass_embedded-${env:DART_SASS_VERSION}-windows-x64.zip" -DestinationPath .;
-        echo "DART_SASS_EMBEDDED_BINARY=$env:GITHUB_WORKSPACE/sass_embedded/dart-sass-embedded.bat" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf-8 -Append
+        curl -LJO "https://github.com/sass/dart-sass/releases/download/${env:SASS_VERSION}/dart-sass-${env:SASS_VERSION}-windows-x64.zip";
+        Expand-Archive -Path "dart-sass-${env:SASS_VERSION}-windows-x64.zip" -DestinationPath .;
+        echo "DART_SASS_BINARY=$env:GITHUB_WORKSPACE/dart-sass/sass.bat" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf-8 -Append
     - name: Test
       run: go test -race . -coverprofile=coverage.txt -covermode=atomic
     - name: Upload coverage
diff --git a/internal/embeddedsass/README.md b/internal/embeddedsass/README.md
index 27d1762..e9da421 100644
--- a/internal/embeddedsass/README.md
+++ b/internal/embeddedsass/README.md
@@ -1,5 +1,5 @@
 
 * Install protobuf: https://github.com/protocolbuffers/protobuf
-* Install the Go plugin: go get -u google.golang.org/protobuf/cmd/protoc-gen-go
-* Download the correct version of the proto file: https://github.com/sass/embedded-protocol/blob/master/embedded_sass.proto
+* Install the Go plugin: go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+* Download the correct version of the proto file: https://github.com/sass/sass/blob/main/spec/embedded_sass.proto
 * protoc --go_opt=Membedded_sass.proto=github.com/bep/godartsass/internal/embeddedsass --go_opt=paths=source_relative --go_out=. embedded_sass.proto
diff --git a/internal/embeddedsass/embedded_sass.pb.go b/internal/embeddedsass/embedded_sass.pb.go
index f0f7582..36a31ec 100644
--- a/internal/embeddedsass/embedded_sass.pb.go
+++ b/internal/embeddedsass/embedded_sass.pb.go
@@ -4,8 +4,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
-// 	protoc        v3.21.9
+// 	protoc-gen-go v1.30.0
+// 	protoc        v4.23.2
 // source: embedded_sass.proto
 
 package embeddedsass
@@ -802,15 +802,15 @@ type SourceSpan struct {
 	// the text between `start.offset` and `end.offset` in the source file
 	// referred to by `url`.
 	Text string `protobuf:"bytes,1,opt,name=text,proto3" json:"text,omitempty"`
-	// The location of the first character in this span. Mandatory.
+	// The location of the first character in this span.
 	Start *SourceSpan_SourceLocation `protobuf:"bytes,2,opt,name=start,proto3" json:"start,omitempty"`
-	// The location of the first character after this span. Optional.
+	// The location of the first character after this span.
 	//
 	// If this is omitted, it indicates that the span is empty and points
 	// immediately before `start`. In that case, `text` must be empty.
 	//
 	// This must not point to a location before `start`.
-	End *SourceSpan_SourceLocation `protobuf:"bytes,3,opt,name=end,proto3" json:"end,omitempty"`
+	End *SourceSpan_SourceLocation `protobuf:"bytes,3,opt,name=end,proto3,oneof" json:"end,omitempty"`
 	// The URL of the file to which this span refers.
 	//
 	// This may be empty, indicating that the span refers to a
@@ -1129,7 +1129,7 @@ type InboundMessage_VersionRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// This version request's id. Mandatory.
+	// This version request's id.
 	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
 }
 
@@ -1178,9 +1178,6 @@ type InboundMessage_CompileRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// This compilation's request id. This is included in messages sent from the
-	// compiler to the host. Mandatory.
-	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
 	// The input stylesheet to parse. Mandatory.
 	//
 	// Types that are assignable to Input:
@@ -1198,13 +1195,15 @@ type InboundMessage_CompileRequest struct {
 	// importer is checked in order until one recognizes the imported URL.
 	Importers []*InboundMessage_CompileRequest_Importer `protobuf:"bytes,6,rep,name=importers,proto3" json:"importers,omitempty"`
 	// Signatures for custom global functions whose behavior is defined by the
-	// host. These must be valid Sass function signatures that could appear in
-	// after `@function` in a Sass stylesheet, such as
-	// `mix($color1, $color2, $weight: 50%)`.
+	// host.
+	//
+	// If this is not a valid Sass function signature that could appear after
+	// `@function` in a Sass stylesheet (such as `mix($color1, $color2, $weight:
+	// 50%)`), or if it conflicts with a function name that's built into the
+	// Sass language, the compiler must treat the compilation as failed.
 	//
 	// Compilers must ensure that pure-Sass functions take precedence over
-	// custom global functions. They must also reject any custom function names
-	// that conflict with function names built into the Sass language.
+	// custom global functions.
 	GlobalFunctions []string `protobuf:"bytes,7,rep,name=global_functions,json=globalFunctions,proto3" json:"global_functions,omitempty"`
 	// Whether to use terminal colors in the formatted message of errors and
 	// logs.
@@ -1257,13 +1256,6 @@ func (*InboundMessage_CompileRequest) Descriptor() ([]byte, []int) {
 	return file_embedded_sass_proto_rawDescGZIP(), []int{0, 1}
 }
 
-func (x *InboundMessage_CompileRequest) GetId() uint32 {
-	if x != nil {
-		return x.Id
-	}
-	return 0
-}
-
 func (m *InboundMessage_CompileRequest) GetInput() isInboundMessage_CompileRequest_Input {
 	if m != nil {
 		return m.Input
@@ -1380,9 +1372,9 @@ type InboundMessage_CanonicalizeResponse struct {
 	unknownFields protoimpl.UnknownFields
 
 	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
-	// The result of canonicalization. Optional. If this is `null`, it indicates
-	// that the importer either did not recognize the URL, or could not find a
-	// stylesheet at the location it referred to.
+	// The result of canonicalization. If this is unset, it indicates that the
+	// importer either did not recognize the URL, or could not find a stylesheet
+	// at the location it referred to. Optional.
 	//
 	// Types that are assignable to Result:
 	//
@@ -1456,8 +1448,10 @@ type isInboundMessage_CanonicalizeResponse_Result interface {
 }
 
 type InboundMessage_CanonicalizeResponse_Url struct {
-	// The successfully canonicalized URL. This must be an absolute URL,
-	// including scheme.
+	// The successfully canonicalized URL.
+	//
+	// If this is not an absolute URL (including scheme), the compiler must
+	// treat that as an error thrown by the importer.
 	Url string `protobuf:"bytes,2,opt,name=url,proto3,oneof"`
 }
 
@@ -1481,9 +1475,9 @@ type InboundMessage_ImportResponse struct {
 	unknownFields protoimpl.UnknownFields
 
 	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
-	// The result of loading the URL. Optional. If this is `null`, it indicates
-	// that the importer either did not recognize the URL, or could not find a
-	// stylesheet at the location it referred to.
+	// The result of loading the URL. If this is unset, it indicates that the
+	// importer either did not recognize the URL, or could not find a stylesheet
+	// at the location it referred to. Optional.
 	//
 	// Types that are assignable to Result:
 	//
@@ -1577,9 +1571,9 @@ type InboundMessage_FileImportResponse struct {
 	unknownFields protoimpl.UnknownFields
 
 	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
-	// The result of loading the URL. Optional. A null result indicates that the
+	// The result of loading the URL. An unset result indicates that the
 	// importer did not recognize the URL and other importers or load paths
-	// should be tried.
+	// should be tried. Optional.
 	//
 	// Types that are assignable to Result:
 	//
@@ -1656,9 +1650,10 @@ type InboundMessage_FileImportResponse_FileUrl struct {
 	// The absolute `file:` URL to look for the file on the physical
 	// filesystem.
 	//
-	// The host must ensure that this URL follows the format for an absolute
-	// `file:` URL on the current operating system without a hostname, and the
-	// compiler must verify this to the best of its ability. See
+	// The compiler must verify to the best of its ability that this URL
+	// follows the format for an absolute `file:` URL on the current operating
+	// system without a hostname. If it doesn't, the compiler must treat that
+	// as an error thrown by the importer. See
 	// https://en.wikipedia.org/wiki/File_URI_scheme for details on the
 	// format.
 	//
@@ -1694,9 +1689,9 @@ type InboundMessage_FunctionCallResponse struct {
 	//	*InboundMessage_FunctionCallResponse_Error
 	Result isInboundMessage_FunctionCallResponse_Result `protobuf_oneof:"result"`
 	// The IDs of all `Value.ArgumentList`s in `FunctionCallRequest.arguments`
-	// whose keywords were accessed. See `Value.ArgumentList` for details.
-	// Mandatory if `result.success` is set. This may not include the special
-	// value `0` and it may not include multiple instances of the same ID.
+	// whose keywords were accessed. See `Value.ArgumentList` for details. This
+	// may not include the special value `0` and it may not include multiple
+	// instances of the same ID.
 	AccessedArgumentLists []uint32 `protobuf:"varint,4,rep,packed,name=accessed_argument_lists,json=accessedArgumentLists,proto3" json:"accessed_argument_lists,omitempty"`
 }
 
@@ -1990,19 +1985,20 @@ type InboundMessage_ImportResponse_ImportSuccess struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The text of the stylesheet. Mandatory.
+	// The text of the stylesheet.
 	Contents string `protobuf:"bytes,1,opt,name=contents,proto3" json:"contents,omitempty"`
-	// The syntax of `contents`. Mandatory.
+	// The syntax of `contents`.
 	Syntax Syntax `protobuf:"varint,2,opt,name=syntax,proto3,enum=sass.embedded_protocol.Syntax" json:"syntax,omitempty"`
 	// An absolute, browser-accessible URL indicating the resolved location of
-	// the imported stylesheet. Optional.
+	// the imported stylesheet.
 	//
 	// This should be a `file:` URL if one is available, but an `http:` URL is
 	// acceptable as well. If no URL is supplied, a `data:` URL is generated
 	// automatically from `contents`.
 	//
-	// If this is provided, it must be an absolute URL, including scheme.
-	SourceMapUrl string `protobuf:"bytes,3,opt,name=source_map_url,json=sourceMapUrl,proto3" json:"source_map_url,omitempty"`
+	// If this is provided and is not an absolute URL (including scheme) the
+	// compiler must treat that as an error thrown by the importer.
+	SourceMapUrl *string `protobuf:"bytes,3,opt,name=source_map_url,json=sourceMapUrl,proto3,oneof" json:"source_map_url,omitempty"`
 }
 
 func (x *InboundMessage_ImportResponse_ImportSuccess) Reset() {
@@ -2052,8 +2048,8 @@ func (x *InboundMessage_ImportResponse_ImportSuccess) GetSyntax() Syntax {
 }
 
 func (x *InboundMessage_ImportResponse_ImportSuccess) GetSourceMapUrl() string {
-	if x != nil {
-		return x.SourceMapUrl
+	if x != nil && x.SourceMapUrl != nil {
+		return *x.SourceMapUrl
 	}
 	return ""
 }
@@ -2064,7 +2060,7 @@ type OutboundMessage_VersionResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// This version request's id. Mandatory.
+	// This version request's id.
 	Id uint32 `protobuf:"varint,5,opt,name=id,proto3" json:"id,omitempty"`
 	// The version of the embedded protocol, in semver format.
 	ProtocolVersion string `protobuf:"bytes,1,opt,name=protocol_version,json=protocolVersion,proto3" json:"protocol_version,omitempty"`
@@ -2152,8 +2148,6 @@ type OutboundMessage_CompileResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The compilation's request id. Mandatory.
-	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
 	// The success or failure result of the compilation. Mandatory.
 	//
 	// Types that are assignable to Result:
@@ -2161,6 +2155,13 @@ type OutboundMessage_CompileResponse struct {
 	//	*OutboundMessage_CompileResponse_Success
 	//	*OutboundMessage_CompileResponse_Failure
 	Result isOutboundMessage_CompileResponse_Result `protobuf_oneof:"result"`
+	// The canonical URLs of all source files loaded during the compilation.
+	//
+	// The compiler must ensure that each canonical URL appears only once in
+	// this list. This must include the entrypoint file's URL if either
+	// `CompileRequest.input.path` or `CompileRequest.StringInput.url` was
+	// passed.
+	LoadedUrls []string `protobuf:"bytes,4,rep,name=loaded_urls,json=loadedUrls,proto3" json:"loaded_urls,omitempty"`
 }
 
 func (x *OutboundMessage_CompileResponse) Reset() {
@@ -2195,13 +2196,6 @@ func (*OutboundMessage_CompileResponse) Descriptor() ([]byte, []int) {
 	return file_embedded_sass_proto_rawDescGZIP(), []int{1, 1}
 }
 
-func (x *OutboundMessage_CompileResponse) GetId() uint32 {
-	if x != nil {
-		return x.Id
-	}
-	return 0
-}
-
 func (m *OutboundMessage_CompileResponse) GetResult() isOutboundMessage_CompileResponse_Result {
 	if m != nil {
 		return m.Result
@@ -2223,6 +2217,13 @@ func (x *OutboundMessage_CompileResponse) GetFailure() *OutboundMessage_CompileR
 	return nil
 }
 
+func (x *OutboundMessage_CompileResponse) GetLoadedUrls() []string {
+	if x != nil {
+		return x.LoadedUrls
+	}
+	return nil
+}
+
 type isOutboundMessage_CompileResponse_Result interface {
 	isOutboundMessage_CompileResponse_Result()
 }
@@ -2247,13 +2248,11 @@ type OutboundMessage_LogEvent struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The request id for the compilation that triggered the message. Mandatory.
-	CompilationId uint32       `protobuf:"varint,1,opt,name=compilation_id,json=compilationId,proto3" json:"compilation_id,omitempty"`
-	Type          LogEventType `protobuf:"varint,2,opt,name=type,proto3,enum=sass.embedded_protocol.LogEventType" json:"type,omitempty"`
+	Type LogEventType `protobuf:"varint,2,opt,name=type,proto3,enum=sass.embedded_protocol.LogEventType" json:"type,omitempty"`
 	// The text of the message.
 	Message string `protobuf:"bytes,3,opt,name=message,proto3" json:"message,omitempty"`
-	// The span associated with this message. Optional.
-	Span *SourceSpan `protobuf:"bytes,4,opt,name=span,proto3" json:"span,omitempty"`
+	// The span associated with this message.
+	Span *SourceSpan `protobuf:"bytes,4,opt,name=span,proto3,oneof" json:"span,omitempty"`
 	// The stack trace associated with this message.
 	//
 	// The empty string indicates that no stack trace is available. Otherwise,
@@ -2298,13 +2297,6 @@ func (*OutboundMessage_LogEvent) Descriptor() ([]byte, []int) {
 	return file_embedded_sass_proto_rawDescGZIP(), []int{1, 2}
 }
 
-func (x *OutboundMessage_LogEvent) GetCompilationId() uint32 {
-	if x != nil {
-		return x.CompilationId
-	}
-	return 0
-}
-
 func (x *OutboundMessage_LogEvent) GetType() LogEventType {
 	if x != nil {
 		return x.Type
@@ -2408,11 +2400,9 @@ type OutboundMessage_CanonicalizeRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
-	// The request id for the compilation that triggered the message. Mandatory.
-	CompilationId uint32 `protobuf:"varint,2,opt,name=compilation_id,json=compilationId,proto3" json:"compilation_id,omitempty"`
 	// The unique ID of the importer being invoked. This must match an importer
 	// ID passed to this compilation in `CompileRequest.importers` or
-	// `CompileRequest.input.string.importer`. Mandatory.
+	// `CompileRequest.input.string.importer`.
 	ImporterId uint32 `protobuf:"varint,3,opt,name=importer_id,json=importerId,proto3" json:"importer_id,omitempty"`
 	// The URL of the import to be canonicalized. This may be either absolute or
 	// relative.
@@ -2474,13 +2464,6 @@ func (x *OutboundMessage_CanonicalizeRequest) GetId() uint32 {
 	return 0
 }
 
-func (x *OutboundMessage_CanonicalizeRequest) GetCompilationId() uint32 {
-	if x != nil {
-		return x.CompilationId
-	}
-	return 0
-}
-
 func (x *OutboundMessage_CanonicalizeRequest) GetImporterId() uint32 {
 	if x != nil {
 		return x.ImporterId
@@ -2509,12 +2492,9 @@ type OutboundMessage_ImportRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
-	// The request id for the compilation that triggered the message. Mandatory.
-	CompilationId uint32 `protobuf:"varint,2,opt,name=compilation_id,json=compilationId,proto3" json:"compilation_id,omitempty"`
 	// The unique ID of the importer being invoked. This must match an
 	// `Importer.importer_id` passed to this compilation in
 	// `CompileRequest.importers` or `CompileRequest.input.string.importer`.
-	// Mandatory.
 	ImporterId uint32 `protobuf:"varint,3,opt,name=importer_id,json=importerId,proto3" json:"importer_id,omitempty"`
 	// The canonical URL of the import. This is guaranteed to be a URL returned
 	// by a `CanonicalizeRequest` to this importer.
@@ -2560,13 +2540,6 @@ func (x *OutboundMessage_ImportRequest) GetId() uint32 {
 	return 0
 }
 
-func (x *OutboundMessage_ImportRequest) GetCompilationId() uint32 {
-	if x != nil {
-		return x.CompilationId
-	}
-	return 0
-}
-
 func (x *OutboundMessage_ImportRequest) GetImporterId() uint32 {
 	if x != nil {
 		return x.ImporterId
@@ -2632,12 +2605,9 @@ type OutboundMessage_FileImportRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
-	// The request id for the compilation that triggered the message. Mandatory.
-	CompilationId uint32 `protobuf:"varint,2,opt,name=compilation_id,json=compilationId,proto3" json:"compilation_id,omitempty"`
 	// The unique ID of the importer being invoked. This must match an
 	// `Importer.file_importer_id` passed to this compilation in
 	// `CompileRequest.importers` or `CompileRequest.input.string.importer`.
-	// Mandatory.
 	ImporterId uint32 `protobuf:"varint,3,opt,name=importer_id,json=importerId,proto3" json:"importer_id,omitempty"`
 	// The (non-canonicalized) URL of the import.
 	Url string `protobuf:"bytes,4,opt,name=url,proto3" json:"url,omitempty"`
@@ -2691,13 +2661,6 @@ func (x *OutboundMessage_FileImportRequest) GetId() uint32 {
 	return 0
 }
 
-func (x *OutboundMessage_FileImportRequest) GetCompilationId() uint32 {
-	if x != nil {
-		return x.CompilationId
-	}
-	return 0
-}
-
 func (x *OutboundMessage_FileImportRequest) GetImporterId() uint32 {
 	if x != nil {
 		return x.ImporterId
@@ -2726,8 +2689,6 @@ type OutboundMessage_FunctionCallRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	Id uint32 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
-	// The request id for the compilation that triggered the message. Mandatory.
-	CompilationId uint32 `protobuf:"varint,2,opt,name=compilation_id,json=compilationId,proto3" json:"compilation_id,omitempty"`
 	// An identifier that indicates which function to invoke. Mandatory.
 	//
 	// Types that are assignable to Identifier:
@@ -2736,7 +2697,7 @@ type OutboundMessage_FunctionCallRequest struct {
 	//	*OutboundMessage_FunctionCallRequest_FunctionId
 	Identifier isOutboundMessage_FunctionCallRequest_Identifier `protobuf_oneof:"identifier"`
 	// The arguments passed to the function, in the order they appear in the
-	// function signature passed to `CompileRequest.global_functions`. Mandatory.
+	// function signature passed to `CompileRequest.global_functions`.
 	//
 	// The compiler must ensure that a valid number of arguments are passed for
 	// the given signature, that default argument values are instantiated
@@ -2784,13 +2745,6 @@ func (x *OutboundMessage_FunctionCallRequest) GetId() uint32 {
 	return 0
 }
 
-func (x *OutboundMessage_FunctionCallRequest) GetCompilationId() uint32 {
-	if x != nil {
-		return x.CompilationId
-	}
-	return 0
-}
-
 func (m *OutboundMessage_FunctionCallRequest) GetIdentifier() isOutboundMessage_FunctionCallRequest_Identifier {
 	if m != nil {
 		return m.Identifier
@@ -2860,13 +2814,6 @@ type OutboundMessage_CompileResponse_CompileSuccess struct {
 	// host's (or the host's user's) responsibility to determine how the
 	// generated CSS can be reached from the source map.
 	SourceMap string `protobuf:"bytes,2,opt,name=source_map,json=sourceMap,proto3" json:"source_map,omitempty"`
-	// The canonical URLs of all source files loaded during the compilation.
-	//
-	// The compiler must ensure that each canonical URL appears only once in
-	// this list. This must include the entrypoint file's URL if either
-	// `CompileRequest.input.path` or `CompileRequest.StringInput.url` was
-	// passed.
-	LoadedUrls []string `protobuf:"bytes,3,rep,name=loaded_urls,json=loadedUrls,proto3" json:"loaded_urls,omitempty"`
 }
 
 func (x *OutboundMessage_CompileResponse_CompileSuccess) Reset() {
@@ -2915,13 +2862,6 @@ func (x *OutboundMessage_CompileResponse_CompileSuccess) GetSourceMap() string {
 	return ""
 }
 
-func (x *OutboundMessage_CompileResponse_CompileSuccess) GetLoadedUrls() []string {
-	if x != nil {
-		return x.LoadedUrls
-	}
-	return nil
-}
-
 // A message indicating that the Sass file could not be successfully
 // compiled to CSS.
 type OutboundMessage_CompileResponse_CompileFailure struct {
@@ -2931,7 +2871,7 @@ type OutboundMessage_CompileResponse_CompileFailure struct {
 
 	// A message describing the reason for the failure.
 	Message string `protobuf:"bytes,1,opt,name=message,proto3" json:"message,omitempty"`
-	// The span associated with the failure. Mandatory.
+	// The span associated with the failure.
 	Span *SourceSpan `protobuf:"bytes,2,opt,name=span,proto3" json:"span,omitempty"`
 	// The stack trace associated with the failure.
 	//
@@ -3011,12 +2951,11 @@ type SourceSpan_SourceLocation struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The 0-based offset of this location within the source file. Mandatory.
+	// The 0-based offset of this location within the source file.
 	Offset uint32 `protobuf:"varint,1,opt,name=offset,proto3" json:"offset,omitempty"`
 	// The 0-based line number of this location within the source file.
-	// Mandatory.
 	Line uint32 `protobuf:"varint,2,opt,name=line,proto3" json:"line,omitempty"`
-	// The 0-based column number of this location within its line. Mandatory.
+	// The 0-based column number of this location within its line.
 	Column uint32 `protobuf:"varint,3,opt,name=column,proto3" json:"column,omitempty"`
 }
 
@@ -3079,9 +3018,9 @@ type Value_String struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The contents of the string. Mandatory.
+	// The contents of the string.
 	Text string `protobuf:"bytes,1,opt,name=text,proto3" json:"text,omitempty"`
-	// Whether the string is quoted or unquoted. Mandatory.
+	// Whether the string is quoted or unquoted.
 	Quoted bool `protobuf:"varint,2,opt,name=quoted,proto3" json:"quoted,omitempty"`
 }
 
@@ -3137,7 +3076,7 @@ type Value_Number struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The number's numeric value. Mandatory.
+	// The number's numeric value.
 	Value float64 `protobuf:"fixed64,1,opt,name=value,proto3" json:"value,omitempty"`
 	// The number's numerator units.
 	//
@@ -3216,13 +3155,13 @@ type Value_RgbColor struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The color's red channel. Mandatory. May not be above 255.
+	// The color's red channel. May not be above 255.
 	Red uint32 `protobuf:"varint,1,opt,name=red,proto3" json:"red,omitempty"`
-	// The color's green channel. Mandatory. May not be above 255.
+	// The color's green channel. May not be above 255.
 	Green uint32 `protobuf:"varint,2,opt,name=green,proto3" json:"green,omitempty"`
-	// The color's blue channel. Mandatory. May not be above 255.
+	// The color's blue channel. May not be above 255.
 	Blue uint32 `protobuf:"varint,3,opt,name=blue,proto3" json:"blue,omitempty"`
-	// The color's alpha channel. Mandatory. Must be between 0 and 1,
+	// The color's alpha channel. Must be between 0 and 1,
 	// inclusive.
 	Alpha float64 `protobuf:"fixed64,4,opt,name=alpha,proto3" json:"alpha,omitempty"`
 }
@@ -3293,15 +3232,15 @@ type Value_HslColor struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The color's hue. Mandatory.
+	// The color's hue.
 	Hue float64 `protobuf:"fixed64,1,opt,name=hue,proto3" json:"hue,omitempty"`
-	// The color's percent saturation. Mandatory. Must be between 0 and 100,
+	// The color's percent saturation. Must be between 0 and 100,
 	// inclusive.
 	Saturation float64 `protobuf:"fixed64,2,opt,name=saturation,proto3" json:"saturation,omitempty"`
-	// The color's percent lightness. Mandatory. Must be between 0 and 100,
+	// The color's percent lightness. Must be between 0 and 100,
 	// inclusive.
 	Lightness float64 `protobuf:"fixed64,3,opt,name=lightness,proto3" json:"lightness,omitempty"`
-	// The color's alpha channel. Mandatory. Must be between 0 and 1,
+	// The color's alpha channel. Must be between 0 and 1,
 	// inclusive.
 	Alpha float64 `protobuf:"fixed64,4,opt,name=alpha,proto3" json:"alpha,omitempty"`
 }
@@ -3373,12 +3312,12 @@ type Value_HwbColor struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The color's hue. Mandatory.
+	// The color's hue.
 	Hue float64 `protobuf:"fixed64,1,opt,name=hue,proto3" json:"hue,omitempty"`
-	// The color's percent whiteness. Mandatory. Must be between 0 and 100,
+	// The color's percent whiteness. Must be between 0 and 100,
 	// inclusive. The sum of `whiteness` and `blackness` must not exceed 100.
 	Whiteness float64 `protobuf:"fixed64,2,opt,name=whiteness,proto3" json:"whiteness,omitempty"`
-	// The color's percent blackness. Mandatory. Must be between 0 and 100,
+	// The color's percent blackness. Must be between 0 and 100,
 	// inclusive. The sum of `whiteness` and `blackness` must not exceed 100.
 	Blackness float64 `protobuf:"fixed64,3,opt,name=blackness,proto3" json:"blackness,omitempty"`
 	// The color's alpha channel. Mandatory. Must be between 0 and 1,
@@ -3635,7 +3574,8 @@ type Value_HostFunction struct {
 	//
 	// If this isn't a valid Sass function signature that could appear after
 	// `@function` in a Sass stylesheet (such as `mix($color1, $color2, $weight:
-	// 50%)`), the compiler must treat the function's return value as invalid.
+	// 50%)`), the compiler must treat it as though the function that returned
+	// this `HostFunction` threw an error.
 	//
 	// > This ensures that the host doesn't need to be able to correctly parse
 	// > the entire function declaration syntax.
@@ -4123,7 +4063,7 @@ var File_embedded_sass_proto protoreflect.FileDescriptor
 var file_embedded_sass_proto_rawDesc = []byte{
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+	0x10, 0x01, 0x12, 0x09, 0x0a, 0x05, 0x54, 0x49, 0x4d, 0x45, 0x53, 0x10, 0x02, 0x12, 0x0a, 0x0a,
+	0x06, 0x44, 0x49, 0x56, 0x49, 0x44, 0x45, 0x10, 0x03, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x33,
 }
 
 var (
@@ -5267,6 +5199,7 @@ func file_embedded_sass_proto_init() {
 		(*OutboundMessage_FunctionCallRequest_)(nil),
 		(*OutboundMessage_VersionResponse_)(nil),
 	}
+	file_embedded_sass_proto_msgTypes[3].OneofWrappers = []interface{}{}
 	file_embedded_sass_proto_msgTypes[4].OneofWrappers = []interface{}{
 		(*Value_String_)(nil),
 		(*Value_Number_)(nil),
@@ -5306,10 +5239,12 @@ func file_embedded_sass_proto_init() {
 		(*InboundMessage_CompileRequest_Importer_ImporterId)(nil),
 		(*InboundMessage_CompileRequest_Importer_FileImporterId)(nil),
 	}
+	file_embedded_sass_proto_msgTypes[13].OneofWrappers = []interface{}{}
 	file_embedded_sass_proto_msgTypes[15].OneofWrappers = []interface{}{
 		(*OutboundMessage_CompileResponse_Success)(nil),
 		(*OutboundMessage_CompileResponse_Failure)(nil),
 	}
+	file_embedded_sass_proto_msgTypes[16].OneofWrappers = []interface{}{}
 	file_embedded_sass_proto_msgTypes[20].OneofWrappers = []interface{}{
 		(*OutboundMessage_FunctionCallRequest_Name)(nil),
 		(*OutboundMessage_FunctionCallRequest_FunctionId)(nil),
diff --git a/internal/embeddedsass/embedded_sass.proto b/internal/embeddedsass/embedded_sass.proto
index 52881b8..e5e0c2a 100644
--- a/internal/embeddedsass/embedded_sass.proto
+++ b/internal/embeddedsass/embedded_sass.proto
@@ -15,7 +15,7 @@ message InboundMessage {
   // which features the compiler supports, or to ensure that it's compatible
   // with the same protocol version the compiler supports.
   message VersionRequest {
-    // This version request's id. Mandatory.
+    // This version request's id.
     uint32 id = 1;
 
     // This message's contents are intentionally empty. It just acts as a signal
@@ -25,9 +25,7 @@ message InboundMessage {
 
   // A request that compiles an entrypoint to CSS.
   message CompileRequest {
-    // This compilation's request id. This is included in messages sent from the
-    // compiler to the host. Mandatory.
-    uint32 id = 1;
+    reserved 1;
 
     // An input stylesheet provided as plain text, rather than loaded from the
     // filesystem.
@@ -100,13 +98,15 @@ message InboundMessage {
     repeated Importer importers = 6;
 
     // Signatures for custom global functions whose behavior is defined by the
-    // host. These must be valid Sass function signatures that could appear in
-    // after `@function` in a Sass stylesheet, such as
-    // `mix($color1, $color2, $weight: 50%)`.
+    // host.
+    //
+    // If this is not a valid Sass function signature that could appear after
+    // `@function` in a Sass stylesheet (such as `mix($color1, $color2, $weight:
+    // 50%)`), or if it conflicts with a function name that's built into the
+    // Sass language, the compiler must treat the compilation as failed.
     //
     // Compilers must ensure that pure-Sass functions take precedence over
-    // custom global functions. They must also reject any custom function names
-    // that conflict with function names built into the Sass language.
+    // custom global functions.
     repeated string global_functions = 7;
 
     // Whether to use terminal colors in the formatted message of errors and
@@ -137,12 +137,14 @@ message InboundMessage {
   message CanonicalizeResponse {
     uint32 id = 1;
 
-    // The result of canonicalization. Optional. If this is `null`, it indicates
-    // that the importer either did not recognize the URL, or could not find a
-    // stylesheet at the location it referred to.
+    // The result of canonicalization. If this is unset, it indicates that the
+    // importer either did not recognize the URL, or could not find a stylesheet
+    // at the location it referred to. Optional.
     oneof result {
-      // The successfully canonicalized URL. This must be an absolute URL,
-      // including scheme.
+      // The successfully canonicalized URL.
+      //
+      // If this is not an absolute URL (including scheme), the compiler must
+      // treat that as an error thrown by the importer.
       string url = 2;
 
       // An error message explaining why canonicalization failed.
@@ -160,26 +162,27 @@ message InboundMessage {
 
     // The stylesheet's contents were loaded successfully.
     message ImportSuccess {
-      // The text of the stylesheet. Mandatory.
+      // The text of the stylesheet.
       string contents = 1;
 
-      // The syntax of `contents`. Mandatory.
+      // The syntax of `contents`.
       Syntax syntax = 2;
 
       // An absolute, browser-accessible URL indicating the resolved location of
-      // the imported stylesheet. Optional.
+      // the imported stylesheet.
       //
       // This should be a `file:` URL if one is available, but an `http:` URL is
       // acceptable as well. If no URL is supplied, a `data:` URL is generated
       // automatically from `contents`.
       //
-      // If this is provided, it must be an absolute URL, including scheme.
-      string source_map_url = 3;
+      // If this is provided and is not an absolute URL (including scheme) the
+      // compiler must treat that as an error thrown by the importer.
+      optional string source_map_url = 3;
     }
 
-    // The result of loading the URL. Optional. If this is `null`, it indicates
-    // that the importer either did not recognize the URL, or could not find a
-    // stylesheet at the location it referred to.
+    // The result of loading the URL. If this is unset, it indicates that the
+    // importer either did not recognize the URL, or could not find a stylesheet
+    // at the location it referred to. Optional.
     oneof result {
       // The contents of the loaded stylesheet.
       ImportSuccess success = 2;
@@ -193,16 +196,17 @@ message InboundMessage {
   message FileImportResponse {
     uint32 id = 1;
 
-    // The result of loading the URL. Optional. A null result indicates that the
+    // The result of loading the URL. An unset result indicates that the
     // importer did not recognize the URL and other importers or load paths
-    // should be tried.
+    // should be tried. Optional.
     oneof result {
       // The absolute `file:` URL to look for the file on the physical
       // filesystem.
       //
-      // The host must ensure that this URL follows the format for an absolute
-      // `file:` URL on the current operating system without a hostname, and the
-      // compiler must verify this to the best of its ability. See
+      // The compiler must verify to the best of its ability that this URL
+      // follows the format for an absolute `file:` URL on the current operating
+      // system without a hostname. If it doesn't, the compiler must treat that
+      // as an error thrown by the importer. See
       // https://en.wikipedia.org/wiki/File_URI_scheme for details on the
       // format.
       //
@@ -232,9 +236,9 @@ message InboundMessage {
     }
 
     // The IDs of all `Value.ArgumentList`s in `FunctionCallRequest.arguments`
-    // whose keywords were accessed. See `Value.ArgumentList` for details.
-    // Mandatory if `result.success` is set. This may not include the special
-    // value `0` and it may not include multiple instances of the same ID.
+    // whose keywords were accessed. See `Value.ArgumentList` for details. This
+    // may not include the special value `0` and it may not include multiple
+    // instances of the same ID.
     repeated uint32 accessed_argument_lists = 4;
   }
 
@@ -255,7 +259,7 @@ message InboundMessage {
 message OutboundMessage {
   // A response that contains the version of the embedded compiler.
   message VersionResponse {
-    // This version request's id. Mandatory.
+    // This version request's id.
     uint32 id = 5;
 
     // The version of the embedded protocol, in semver format.
@@ -276,11 +280,12 @@ message OutboundMessage {
 
   // A response that contains the result of a compilation.
   message CompileResponse {
-    // The compilation's request id. Mandatory.
-    uint32 id = 1;
+    reserved 1;
 
     // A message indicating that the Sass file was successfully compiled to CSS.
     message CompileSuccess {
+      reserved 3;
+
       // The compiled CSS.
       string css = 1;
 
@@ -291,14 +296,6 @@ message OutboundMessage {
       // host's (or the host's user's) responsibility to determine how the
       // generated CSS can be reached from the source map.
       string source_map = 2;
-
-      // The canonical URLs of all source files loaded during the compilation.
-      //
-      // The compiler must ensure that each canonical URL appears only once in
-      // this list. This must include the entrypoint file's URL if either
-      // `CompileRequest.input.path` or `CompileRequest.StringInput.url` was
-      // passed.
-      repeated string loaded_urls = 3;
     }
 
     // A message indicating that the Sass file could not be successfully
@@ -307,7 +304,7 @@ message OutboundMessage {
       // A message describing the reason for the failure.
       string message = 1;
 
-      // The span associated with the failure. Mandatory.
+      // The span associated with the failure.
       SourceSpan span = 2;
 
       // The stack trace associated with the failure.
@@ -331,20 +328,27 @@ message OutboundMessage {
       // The result of a failed compilation.
       CompileFailure failure = 3;
     }
+
+    // The canonical URLs of all source files loaded during the compilation.
+    //
+    // The compiler must ensure that each canonical URL appears only once in
+    // this list. This must include the entrypoint file's URL if either
+    // `CompileRequest.input.path` or `CompileRequest.StringInput.url` was
+    // passed.
+    repeated string loaded_urls = 4;
   }
 
   // An event indicating that a message should be displayed to the user.
   message LogEvent {
-    // The request id for the compilation that triggered the message. Mandatory.
-    uint32 compilation_id = 1;
+    reserved 1;
 
     LogEventType type = 2;
 
     // The text of the message.
     string message = 3;
 
-    // The span associated with this message. Optional.
-    SourceSpan span = 4;
+    // The span associated with this message.
+    optional SourceSpan span = 4;
 
     // The stack trace associated with this message.
     //
@@ -415,14 +419,13 @@ message OutboundMessage {
   //   URLs, it should respond with a `CanonicalizeResponse.result.error`
   //   indicating that the import is ambiguous.
   message CanonicalizeRequest {
-    uint32 id = 1;
+    reserved 2;
 
-    // The request id for the compilation that triggered the message. Mandatory.
-    uint32 compilation_id = 2;
+    uint32 id = 1;
 
     // The unique ID of the importer being invoked. This must match an importer
     // ID passed to this compilation in `CompileRequest.importers` or
-    // `CompileRequest.input.string.importer`. Mandatory.
+    // `CompileRequest.input.string.importer`.
     uint32 importer_id = 3;
 
     // The URL of the import to be canonicalized. This may be either absolute or
@@ -449,15 +452,13 @@ message OutboundMessage {
 
   // A request for a custom importer to load the contents of a stylesheet.
   message ImportRequest {
-    uint32 id = 1;
+    reserved 2;
 
-    // The request id for the compilation that triggered the message. Mandatory.
-    uint32 compilation_id = 2;
+    uint32 id = 1;
 
     // The unique ID of the importer being invoked. This must match an
     // `Importer.importer_id` passed to this compilation in
     // `CompileRequest.importers` or `CompileRequest.input.string.importer`.
-    // Mandatory.
     uint32 importer_id = 3;
 
     // The canonical URL of the import. This is guaranteed to be a URL returned
@@ -509,15 +510,13 @@ message OutboundMessage {
   //
   // [resolving `url`]: https://github.com/sass/sass/tree/main/spec/modules.md#resolving-a-file-url
   message FileImportRequest {
-    uint32 id = 1;
+    reserved 2;
 
-    // The request id for the compilation that triggered the message. Mandatory.
-    uint32 compilation_id = 2;
+    uint32 id = 1;
 
     // The unique ID of the importer being invoked. This must match an
     // `Importer.file_importer_id` passed to this compilation in
     // `CompileRequest.importers` or `CompileRequest.input.string.importer`.
-    // Mandatory.
     uint32 importer_id = 3;
 
     // The (non-canonicalized) URL of the import.
@@ -536,10 +535,9 @@ message OutboundMessage {
 
   // A request to invoke a custom Sass function and return its result.
   message FunctionCallRequest {
-    uint32 id = 1;
+    reserved 2;
 
-    // The request id for the compilation that triggered the message. Mandatory.
-    uint32 compilation_id = 2;
+    uint32 id = 1;
 
     // An identifier that indicates which function to invoke. Mandatory.
     oneof identifier {
@@ -558,7 +556,7 @@ message OutboundMessage {
     }
 
     // The arguments passed to the function, in the order they appear in the
-    // function signature passed to `CompileRequest.global_functions`. Mandatory.
+    // function signature passed to `CompileRequest.global_functions`.
     //
     // The compiler must ensure that a valid number of arguments are passed for
     // the given signature, that default argument values are instantiated
@@ -656,27 +654,26 @@ message SourceSpan {
 
   // A single point in a source file.
   message SourceLocation {
-    // The 0-based offset of this location within the source file. Mandatory.
+    // The 0-based offset of this location within the source file.
     uint32 offset = 1;
 
     // The 0-based line number of this location within the source file.
-    // Mandatory.
     uint32 line = 2;
 
-    // The 0-based column number of this location within its line. Mandatory.
+    // The 0-based column number of this location within its line.
     uint32 column = 3;
   }
 
-  // The location of the first character in this span. Mandatory.
+  // The location of the first character in this span.
   SourceLocation start = 2;
 
-  // The location of the first character after this span. Optional.
+  // The location of the first character after this span.
   //
   // If this is omitted, it indicates that the span is empty and points
   // immediately before `start`. In that case, `text` must be empty.
   //
   // This must not point to a location before `start`.
-  SourceLocation end = 3;
+  optional SourceLocation end = 3;
 
   // The URL of the file to which this span refers.
   //
@@ -698,16 +695,16 @@ message SourceSpan {
 message Value {
   // A SassScript string value.
   message String {
-    // The contents of the string. Mandatory.
+    // The contents of the string.
     string text = 1;
 
-    // Whether the string is quoted or unquoted. Mandatory.
+    // Whether the string is quoted or unquoted.
     bool quoted = 2;
   }
 
   // A SassScript number value.
   message Number {
-    // The number's numeric value. Mandatory.
+    // The number's numeric value.
     double value = 1;
 
     // The number's numerator units.
@@ -731,34 +728,34 @@ message Value {
   // can affect CSS rendering. As such, either endpoint may choose to send any
   // color value as any one of these three messages.
   message RgbColor {
-    // The color's red channel. Mandatory. May not be above 255.
+    // The color's red channel. May not be above 255.
     uint32 red = 1;
 
-    // The color's green channel. Mandatory. May not be above 255.
+    // The color's green channel. May not be above 255.
     uint32 green = 2;
 
-    // The color's blue channel. Mandatory. May not be above 255.
+    // The color's blue channel. May not be above 255.
     uint32 blue = 3;
 
-    // The color's alpha channel. Mandatory. Must be between 0 and 1,
+    // The color's alpha channel. Must be between 0 and 1,
     // inclusive.
     double alpha = 4;
   }
 
   // A SassScript color value, represented as hue, saturation, and lightness channels.
   message HslColor {
-    // The color's hue. Mandatory.
+    // The color's hue.
     double hue = 1;
 
-    // The color's percent saturation. Mandatory. Must be between 0 and 100,
+    // The color's percent saturation. Must be between 0 and 100,
     // inclusive.
     double saturation = 2;
 
-    // The color's percent lightness. Mandatory. Must be between 0 and 100,
+    // The color's percent lightness. Must be between 0 and 100,
     // inclusive.
     double lightness = 3;
 
-    // The color's alpha channel. Mandatory. Must be between 0 and 1,
+    // The color's alpha channel. Must be between 0 and 1,
     // inclusive.
     double alpha = 4;
   }
@@ -766,14 +763,14 @@ message Value {
   // A SassScript color value, represented as hue, whiteness, and blackness
   // channels.
   message HwbColor {
-    // The color's hue. Mandatory.
+    // The color's hue.
     double hue = 1;
 
-    // The color's percent whiteness. Mandatory. Must be between 0 and 100,
+    // The color's percent whiteness. Must be between 0 and 100,
     // inclusive. The sum of `whiteness` and `blackness` must not exceed 100.
     double whiteness = 2;
 
-    // The color's percent blackness. Mandatory. Must be between 0 and 100,
+    // The color's percent blackness. Must be between 0 and 100,
     // inclusive. The sum of `whiteness` and `blackness` must not exceed 100.
     double blackness = 3;
 
@@ -836,7 +833,8 @@ message Value {
     //
     // If this isn't a valid Sass function signature that could appear after
     // `@function` in a Sass stylesheet (such as `mix($color1, $color2, $weight:
-    // 50%)`), the compiler must treat the function's return value as invalid.
+    // 50%)`), the compiler must treat it as though the function that returned
+    // this `HostFunction` threw an error.
     //
     // > This ensures that the host doesn't need to be able to correctly parse
     // > the entire function declaration syntax.
diff --git a/options.go b/options.go
index 53fee32..2604b0f 100644
--- a/options.go
+++ b/options.go
@@ -54,7 +54,7 @@ type LogEvent struct {
 
 func (opts *Options) init() error {
 	if opts.DartSassEmbeddedFilename == "" {
-		opts.DartSassEmbeddedFilename = defaultDartSassEmbeddedFilename
+		opts.DartSassEmbeddedFilename = defaultDartSassBinaryFilename
 	}
 
 	if opts.Timeout == 0 {
diff --git a/transpiler.go b/transpiler.go
index f00f3f0..607e77f 100644
--- a/transpiler.go
+++ b/transpiler.go
@@ -24,7 +24,7 @@ import (
 	"google.golang.org/protobuf/proto"
 )
 
-const defaultDartSassEmbeddedFilename = "dart-sass-embedded"
+const defaultDartSassBinaryFilename = "sass"
 
 // ErrShutdown will be returned from Execute and Close if the transpiler is or
 // is about to be shut down.
@@ -47,8 +47,8 @@ func Start(opts Options) (*Transpiler, error) {
 	if err != nil {
 		return nil, err
 	}
-
 	cmd := exec.Command(bin)
+	cmd.Args = append(cmd.Args, "--embedded")
 	cmd.Stderr = os.Stderr
 
 	conn, err := newConn(cmd)
@@ -64,6 +64,7 @@ func Start(opts Options) (*Transpiler, error) {
 		opts:    opts,
 		conn:    conn,
 		lenBuf:  make([]byte, binary.MaxVarintLen64),
+		idBuf:   make([]byte, binary.MaxVarintLen64),
 		pending: make(map[uint32]*call),
 	}
 
@@ -81,7 +82,7 @@ func Version(dartSassEmbeddedFilename string) (DartSassVersion, error) {
 		return v, err
 	}
 
-	cmd := exec.Command(bin, "--version")
+	cmd := exec.Command(bin, "--embedded", "--version")
 	cmd.Stderr = os.Stderr
 
 	out, err := cmd.Output()
@@ -94,7 +95,6 @@ func Version(dartSassEmbeddedFilename string) (DartSassVersion, error) {
 	}
 
 	return v, nil
-
 }
 
 type DartSassVersion struct {
@@ -112,6 +112,7 @@ type Transpiler struct {
 	// stdin/stdout of the Dart Sass protocol
 	conn   byteReadWriteCloser
 	lenBuf []byte
+	idBuf  []byte
 	msgBuf []byte
 
 	closing  bool
@@ -170,6 +171,13 @@ func (t *Transpiler) Close() error {
 	t.closing = true
 	err := t.conn.Close()
 
+	if eerr, ok := err.(*exec.ExitError); ok {
+		if eerr.ExitCode() == 1 {
+			// This is the expected exit code when shutting down.
+			return ErrShutdown
+		}
+	}
+
 	return err
 }
 
@@ -259,8 +267,9 @@ func (t *Transpiler) input() {
 	var err error
 
 	for err == nil {
-		// The header is the length in bytes of the remaining message.
+		// The header is the length in bytes of the remaining message including the compilation ID.
 		var l uint64
+
 		l, err = binary.ReadUvarint(t.conn)
 		if err != nil {
 			break
@@ -278,6 +287,14 @@ func (t *Transpiler) input() {
 			break
 		}
 
+		v, n := binary.Uvarint(buf)
+		if n <= 0 {
+			break
+		}
+		compilationID := uint32(v)
+
+		buf = buf[n:]
+
 		var msg embeddedsass.OutboundMessage
 
 		if err = proto.Unmarshal(buf, &msg); err != nil {
@@ -286,20 +303,19 @@ func (t *Transpiler) input() {
 
 		switch c := msg.Message.(type) {
 		case *embeddedsass.OutboundMessage_CompileResponse_:
-			id := c.CompileResponse.Id
 			// Attach it to the correct pending call.
 			t.mu.Lock()
-			call := t.pending[id]
-			delete(t.pending, id)
+			call := t.pending[compilationID]
+			delete(t.pending, compilationID)
 			t.mu.Unlock()
 			if call == nil {
-				err = fmt.Errorf("call with ID %d not found", id)
+				err = fmt.Errorf("call with ID %d not found", compilationID)
 				break
 			}
 			call.Response = &msg
 			call.done()
 		case *embeddedsass.OutboundMessage_CanonicalizeRequest_:
-			call := t.getCall(c.CanonicalizeRequest.CompilationId)
+			call := t.getCall(compilationID)
 			resolved, resolveErr := call.importResolver.CanonicalizeURL(c.CanonicalizeRequest.GetUrl())
 
 			var response *embeddedsass.InboundMessage_CanonicalizeResponse
@@ -324,6 +340,7 @@ func (t *Transpiler) input() {
 			}
 
 			err = t.sendInboundMessage(
+				compilationID,
 				&embeddedsass.InboundMessage{
 					Message: &embeddedsass.InboundMessage_CanonicalizeResponse_{
 						CanonicalizeResponse: response,
@@ -331,7 +348,7 @@ func (t *Transpiler) input() {
 				},
 			)
 		case *embeddedsass.OutboundMessage_ImportRequest_:
-			call := t.getCall(c.ImportRequest.CompilationId)
+			call := t.getCall(compilationID)
 			url := c.ImportRequest.GetUrl()
 			contents, loadErr := call.importResolver.Load(url)
 
@@ -358,13 +375,14 @@ func (t *Transpiler) input() {
 					Result: &embeddedsass.InboundMessage_ImportResponse_Success{
 						Success: &embeddedsass.InboundMessage_ImportResponse_ImportSuccess{
 							Contents:     contents,
-							SourceMapUrl: sourceMapURL,
+							SourceMapUrl: &sourceMapURL,
 						},
 					},
 				}
 			}
 
 			err = t.sendInboundMessage(
+				compilationID,
 				&embeddedsass.InboundMessage{
 					Message: &embeddedsass.InboundMessage_ImportResponse_{
 						ImportResponse: response,
@@ -426,9 +444,19 @@ func (t *Transpiler) input() {
 	}
 }
 
+func (t *Transpiler) nextSeq() uint32 {
+	t.seq++
+	// The compilation ID 0 is reserved for `VersionRequest` and `VersionResponse`,
+	// 4294967295 is reserved for error handling. This is the maximum number representable by a `uint32` so it should be safe to start over.
+	if t.seq == 0 || t.seq == 4294967295 {
+
+	}
+	return t.seq
+}
+
 func (t *Transpiler) newCall(createInbound func(seq uint32) (*embeddedsass.InboundMessage, error), args Args) (*call, error) {
 	t.mu.Lock()
-	id := t.seq
+	id := t.nextSeq()
 	req, err := createInbound(id)
 	if err != nil {
 		t.mu.Unlock()
@@ -449,21 +477,19 @@ func (t *Transpiler) newCall(createInbound func(seq uint32) (*embeddedsass.Inbou
 	}
 
 	t.pending[id] = call
-	t.seq++
 
 	t.mu.Unlock()
 
-	switch c := call.Request.Message.(type) {
+	switch call.Request.Message.(type) {
 	case *embeddedsass.InboundMessage_CompileRequest_:
-		c.CompileRequest.Id = id
 	default:
 		return nil, fmt.Errorf("unsupported request message type. %T", call.Request.Message)
 	}
 
-	return call, t.sendInboundMessage(call.Request)
+	return call, t.sendInboundMessage(id, call.Request)
 }
 
-func (t *Transpiler) sendInboundMessage(message *embeddedsass.InboundMessage) error {
+func (t *Transpiler) sendInboundMessage(compilationID uint32, message *embeddedsass.InboundMessage) error {
 	t.sendMu.Lock()
 	defer t.sendMu.Unlock()
 	t.mu.Lock()
@@ -479,19 +505,24 @@ func (t *Transpiler) sendInboundMessage(message *embeddedsass.InboundMessage) er
 	}
 
 	// Every message must begin with a varint indicating the length in bytes of
-	// the remaining message.
+	// the remaining message including the compilation ID
 	reqLen := uint64(len(out))
-
-	n := binary.PutUvarint(t.lenBuf, reqLen)
-	_, err = t.conn.Write(t.lenBuf[:n])
+	compilationIDLen := binary.PutUvarint(t.idBuf, uint64(compilationID))
+	headerLen := binary.PutUvarint(t.lenBuf, reqLen+uint64(compilationIDLen))
+	_, err = t.conn.Write(t.lenBuf[:headerLen])
+	if err != nil {
+		return err
+	}
+	_, err = t.conn.Write(t.idBuf[:compilationIDLen])
 	if err != nil {
 		return err
 	}
 
-	n, err = t.conn.Write(out)
-	if n != len(out) {
+	headerLen, err = t.conn.Write(out)
+	if headerLen != len(out) {
 		return errors.New("failed to write payload")
 	}
+
 	return err
 }
 
diff --git a/transpiler_test.go b/transpiler_test.go
index 990ea46..3835843 100644
--- a/transpiler_test.go
+++ b/transpiler_test.go
@@ -102,7 +102,6 @@ body
 		{"Invalid SourceSyntax", Options{}, Args{Source: "a", SourceSyntax: "asdf"}, false},
 		{"Erro logging", Options{}, Args{Source: `@error "foo";`}, false},
 	} {
-
 		test := test
 		c.Run(test.name, func(c *qt.C) {
 			b, ok := test.expect.(bool)
@@ -412,8 +411,7 @@ func TestVersion(t *testing.T) {
 	version, err := Version(getSassEmbeddedFilename())
 	c.Assert(err, qt.IsNil)
 	c.Assert(version, qt.Not(qt.Equals), "")
-	c.Assert(version.ProtocolVersion, qt.Equals, "1.1.0")
-
+	c.Assert(version.ProtocolVersion, qt.Equals, "2.0.0")
 }
 
 func newTestTranspiler(c *qt.C, opts Options) (*Transpiler, func()) {
@@ -428,12 +426,12 @@ func newTestTranspiler(c *qt.C, opts Options) (*Transpiler, func()) {
 }
 
 func getSassEmbeddedFilename() string {
-	// https://github.com/sass/dart-sass-embedded/releases
-	if filename := os.Getenv("DART_SASS_EMBEDDED_BINARY"); filename != "" {
+	// https://github.com/sass/dart-sass/releases
+	if filename := os.Getenv("DART_SASS_BINARY"); filename != "" {
 		return filename
 	}
 
-	return defaultDartSassEmbeddedFilename
+	return defaultDartSassBinaryFilename
 }
 
 // used for debugging