diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 64f87c3..3f53183 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -217,7 +217,7 @@ jobs:
       # Sigstore-signed SLSA build-provenance attestation (keyless: Fulcio + Rekor), pushed as an
       # OCI referrer — what protector's provenance observer verifies to "provenance-verified".
       - name: Attest build provenance (Sigstore-signed SLSA)
-        uses: actions/attest-build-provenance@e8998f949152b193b063cb0ec769d69d929409be # v2
+        uses: actions/attest-build-provenance@0f67c3f4856b2e3261c31976d6725780e5e4c373 # v4.1.1
         with:
           subject-name: ghcr.io/${{ github.repository_owner }}/watcher-server
           subject-digest: ${{ steps.build.outputs.digest }}