diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5010311c..7e1753c1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -136,6 +136,14 @@ jobs:
         with:
           python-version: '3.11'
 
+      - name: Build Theia
+        shell: bash
+        working-directory: ./theia
+        run: |
+          npm install -g node-gyp
+          npm ci
+          npm run build
+
       - name: Test (playwright electron)
         shell: bash
         run: xvfb-run yarn ui-tests-ci-electron