diff --git a/.github/workflows/build_container_image.yml b/.github/workflows/build_container_image.yml
index 179c2c0..12eced3 100644
--- a/.github/workflows/build_container_image.yml
+++ b/.github/workflows/build_container_image.yml
@@ -22,5 +22,23 @@ jobs:
       - name: Build the Docker image with latest tag
         run: |
           docker build . --file Dockerfiles/Dockerfile_backend --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}:$GITHUB_SHA --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}:${{ steps.extract_branch.outputs.branch }} --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}:latest
-          docker build . --file Dockerfiles/Dockerfile_frontend --tag docker.io/simon-loacl/${{ env.DOCKER_HUB_REPOSITORY }}-nginx:$GITHUB_SHA --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}-nginx:${{ steps.extract_branch.outputs.branch }} --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}-nginx:latest
+          docker build . --file Dockerfiles/Dockerfile_frontend --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}-nginx:$GITHUB_SHA --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}-nginx:${{ steps.extract_branch.outputs.branch }} --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}-nginx:latest
           echo docker api-explorer-ii with latest tag done
+
+          docker push docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }} --all-tags
+          docker push docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}-nginx --all-tags
+          echo docker push api-explorer-ii with latest tag done
+
+      - uses: sigstore/cosign-installer@main
+      - name: Write signing key to disk (only needed for `cosign sign --key`)
+        run: echo "${{ secrets.COSIGN_PRIVATE_KEY }}" > cosign.key
+      - name: Sign container image with annotations from our environment
+        env:
+          COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
+        run: |
+          cosign sign -y --key cosign.key \
+            -a "repo=${{ github.repository }}" \
+            -a "workflow=${{ github.workflow }}" \
+            -a "ref=${{ github.sha }}" \
+            docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}:${{ steps.extract_branch.outputs.branch }}
+