diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 152b278..8895709 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -51,7 +51,7 @@ jobs:
         run: cosign sign --yes ghcr.io/agentrust-io/ca2a-runtime@${DIGEST}
 
       - name: Attest build provenance (SLSA)
-        uses: actions/attest-build-provenance@v2
+        uses: actions/attest-build-provenance@v4
         with:
           subject-name: ghcr.io/agentrust-io/ca2a-runtime
           subject-digest: ${{ steps.build.outputs.digest }}