diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8a3c939..dcfc551 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -48,6 +48,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          npm run build
           pip install -e .
           pip install "pytest<8"
       - name: Test with pytest
@@ -74,6 +75,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          npm run build
           python -m pip install -U jupyterlab==4.1.2 jupyter-packaging~=0.12
           pip install -e .