diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0e16cc4..7815de0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -62,6 +62,14 @@ jobs:
         pip uninstall -y "tvb-ext-unicore" jupyterlab
         rm -rf myextension
 
+    - name: Package the extension
+      run: |
+        set -eux
+
+        pip install build
+        python -m build
+        pip uninstall -y "tvb-ext-unicore" jupyterlab
+
     - name: Run tests
       run: |
         pytest tvbextunicore -r ap