diff --git a/.github/util/initialize/action.yml b/.github/util/initialize/action.yml
index 858aceae..f122d196 100644
--- a/.github/util/initialize/action.yml
+++ b/.github/util/initialize/action.yml
@@ -26,9 +26,9 @@ runs:
     - uses: bufbuild/buf-setup-action@v1.13.1
       with: {github_token: "${{ inputs.github-token }}"}
 
-    - name: Check out embedded Sass protocol
+    - name: Check out the language repo
       uses: sass/clone-linked-repo@v1
-      with: {repo: sass/embedded-protocol, path: build/embedded-protocol}
+      with: {repo: sass/sass, path: build/language}
 
     - name: Generate Dart from protobuf
       run: dart run grinder protobuf
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a9081d8f..49c37a73 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -162,15 +162,14 @@ jobs:
         uses: sass/clone-linked-repo@v1
         with: {repo: sass/embedded-host-node}
 
-      - name: Check out the JS API definition
+      - name: Check out the language repo
         uses: sass/clone-linked-repo@v1
-        with: {repo: sass/sass, path: language}
+        with: {repo: sass/sass, path: build/language}
 
       - name: Initialize embedded host
         run: |
           npm install
-          npm run init -- --protocol-path=../build/embedded-protocol \
-              --compiler-path=.. --api-path=../language
+          npm run init -- --compiler-path=.. --language-path=../build/language
           npm run compile
           mv {`pwd`/,dist/}lib/src/vendor/dart-sass
         working-directory: embedded-host-node
@@ -185,7 +184,7 @@ jobs:
           fi
 
       - name: Run tests
-        run: npm run js-api-spec -- --sassPackage ../embedded-host-node --sassSassRepo ../language
+        run: npm run js-api-spec -- --sassPackage ../embedded-host-node --sassSassRepo ../build/language
         working-directory: sass-spec
 
   dart_tests:
diff --git a/README.md b/README.md
index df46ad10..d07fa04b 100644
--- a/README.md
+++ b/README.md
@@ -316,7 +316,7 @@ Dart Sass includes an implementation of the compiler side of the [Embedded Sass
 protocol]. It's designed to be embedded in a host language, which then exposes
 an API for users to invoke Sass and define custom functions and importers.
 
-[Embedded Sass protocol]: https://github.com/sass/sass-embedded-protocol/blob/master/README.md#readme
+[Embedded Sass protocol]: https://github.com/sass/sass/blob/main/spec/embedded-protocol.md
 
 ### Usage
 
diff --git a/buf.work.yaml b/buf.work.yaml
index 0cc295bc..3ffcae58 100644
--- a/buf.work.yaml
+++ b/buf.work.yaml
@@ -1,2 +1,2 @@
 version: v1
-directories: [build/embedded-protocol]
+directories: [build/language/spec]
diff --git a/tool/grind.dart b/tool/grind.dart
index 2c02f8dc..b84ad12f 100644
--- a/tool/grind.dart
+++ b/tool/grind.dart
@@ -58,15 +58,16 @@ void main(List<String> args) {
       "${pkg.githubReleaseNotes.defaultValue}";
 
   pkg.environmentConstants.fn = () {
-    if (!Directory('build/embedded-protocol').existsSync()) {
+    if (!Directory('build/language').existsSync()) {
       fail('Run `dart run grinder protobuf` before building Dart Sass '
           'executables.');
     }
 
     return {
       ...pkg.environmentConstants.defaultValue,
-      "protocol-version":
-          File('build/embedded-protocol/VERSION').readAsStringSync().trim(),
+      "protocol-version": File('build/language/spec/EMBEDDED_PROTOCOL_VERSION')
+          .readAsStringSync()
+          .trim(),
       "compiler-version": pkg.pubspec.version!.toString(),
     };
   };
@@ -202,7 +203,8 @@ dart run protoc_plugin "\$@"
   }
 
   if (Platform.environment['UPDATE_SASS_PROTOCOL'] != 'false') {
-    cloneOrCheckout("https://github.com/sass/embedded-protocol.git", "main");
+    cloneOrCheckout("https://github.com/sass/sass.git", "main",
+        name: 'language');
   }
 
   await runAsync("buf",