diff --git a/.github/workflows/bump.yml b/.github/workflows/bump.yml
index 309fd07..392d6aa 100644
--- a/.github/workflows/bump.yml
+++ b/.github/workflows/bump.yml
@@ -31,13 +31,32 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
+      - name: Set up docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: ./api
+          target: php_dev
+          tags: local:latest
+          load: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          push: false
+      - name: Generate OpenAPI contract
+        uses: addnab/docker-run-action@v3
+        with:
+          image: local:latest
+          options: -v ${{github.workspace}}/api:/srv/app -v /srv/app/vendor
+          run: |
+            php bin/console api:openapi:export > openapi.json
       - name: Comment pull request with API diff
         uses: bump-sh/github-action@v1
         with:
           doc: apiplatform-test-demo
           token: ${{secrets.BUMP_TOKEN}}
-          file: docs/openapi.json
+          file: openapi.json
           command: diff
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}