diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index e2832cc..aeb6134 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -89,7 +89,7 @@ jobs:
 
       # ── Attestation (SBOM + provenance) ─────────────────────────────────────
       - name: Generate artifact attestation
-        uses: actions/attest-build-provenance@v1
+        uses: actions/attest-build-provenance@v4
         with:
           subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           subject-digest: ${{ steps.push.outputs.digest }}