diff --git a/.github/workflows/docker-package-publish.yml b/.github/workflows/docker-package-publish.yml
index 93409e4..8e10ac3 100644
--- a/.github/workflows/docker-package-publish.yml
+++ b/.github/workflows/docker-package-publish.yml
@@ -41,7 +41,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # Ensure repository/image name is lowercase for Docker registry
       - name: Set lowercase image name
@@ -181,3 +181,18 @@ jobs:
       - name: Inspect image
         run: |
           docker buildx imagetools inspect ${{ env.REGISTRY }}/${{ steps.image.outputs.lower }}:${{ steps.meta.outputs.version }}
+
+      # Install cosign (before using it)
+      - name: Install cosign
+        uses: sigstore/cosign-installer@v3.7.0
+        with:
+          cosign-release: 'v2.2.4'
+
+      # Sign the pushed image by digest (skip on PRs)
+      - name: Sign image with cosign
+        if: github.event_name != 'pull_request'
+        env:
+          DIGEST: ${{ steps.create-manifest.outputs.digest }}
+          TAGS: ${{ steps.meta.outputs.tags }}
+        run: |
+          echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}