diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 37ab699..9b63c29 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,8 +11,9 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  build:
+  build_jupyter-chat:
     runs-on: ubuntu-latest
+    name: Build jupyter_chat
 
     steps:
     - name: Checkout
@@ -24,48 +25,48 @@ jobs:
     - name: Install dependencies
       run: python -m pip install -U "jupyterlab>=4.0.0,<5"
 
-    - name: Lint the extension
+    - name: Lint the packages
       run: |
         set -eux
         jlpm
         jlpm run lint:check
 
+    - name: Build the core package
+      run: jlpm build:core
+
     - name: Test the packages
       run: |
         set -eux
         jlpm run test
 
-    - name: Build packages
-      run: jlpm build
-
-    - name: Package jupyterlab_ws_chat
-      working-directory: packages/jupyterlab-ws-chat
-      run: |
-        set -eux
-        pip install build
-        python -m build
-        pip uninstall -y "jupyterlab_ws_chat" jupyterlab
+  build_extensions:
+    runs-on: ubuntu-latest
+    needs: build_jupyter-chat
+    strategy:
+      matrix:
+        extension: [collaborative, websocket]
+    name: Build ${{ matrix.extension }} chat extension
+    env:
+      PACKAGE: fromJSON('["jupyterlab_ws_chat", "jupyterlab_${{ matrix.extension }}_chat"]')[matrix.extension == 'websocket']
+      DIRECTORY: fromJSON('["packages/jupyterlab-ws-chat", "packages/jupyterlab-${{ matrix.extension }}-chat"]')[matrix.extension == 'websocket']
 
-    - name: Upload jupyterlab_ws_chat packages
-      uses: actions/upload-artifact@v3
-      with:
-        name: package-artifacts
-        path: packages/jupyterlab-ws-chat/dist/jupyterlab_ws_chat*
-        if-no-files-found: error
+    steps:
+    - name: Build package
+      run: jlpm build:${{ matrix.extension }}
 
-    - name: Package jupyterlab_collaborative_chat
-      working-directory: packages/jupyterlab-collaborative-chat
+    - name: Package ${{ env.PACKAGE }}
+      working-directory: ${{ env.DIRECTORY }}
       run: |
         set -eux
         pip install build
         python -m build
-        pip uninstall -y "jupyterlab_collaborative_chat" jupyterlab
+        pip uninstall -y "${{ env.PACKAGE }}" jupyterlab
 
-    - name: Upload jupyterlab_collaborative_chat packages
+    - name: Upload ${{ env.PACKAGE }} package
       uses: actions/upload-artifact@v3
       with:
         name: package-artifacts
-        path: packages/jupyterlab-collaborative-chat/dist/jupyterlab_collaborative_chat*
+        path: ${{ env.DIRECTORY }}/dist/${{ env.PACKAGE }}*
         if-no-files-found: error
 
   check_links: