diff --git a/.github/workflows/publish-hapi-image.yaml b/.github/workflows/publish-hapi-image.yaml
index 5bb90c2..5ac509c 100644
--- a/.github/workflows/publish-hapi-image.yaml
+++ b/.github/workflows/publish-hapi-image.yaml
@@ -18,17 +18,27 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v6
 
+      - name: Set up Java
+        uses: actions/setup-java@v5
+        with:
+          distribution: temurin
+          java-version: '21'
+
+      # ✅ THIS WAS MISSING
+      - name: Build validation JAR
+        run: mvn -B -ntp package
+
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Log in to GHCR
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and push image (latest) 
+      - name: Build and push image (latest)
         run: |
           IMAGE=ghcr.io/nhsdigital/validation-service-fhir-r4:latest
           docker build -t $IMAGE .