diff --git a/.github/workflows/docker_ci.yml b/.github/workflows/docker_ci.yml
index 1ca4899..a7eaa6b 100644
--- a/.github/workflows/docker_ci.yml
+++ b/.github/workflows/docker_ci.yml
@@ -36,7 +36,7 @@ jobs:
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
         if: github.event_name != 'pull_request'
-        uses: sigstore/cosign-installer@3454372f43399081ed03b604cb2d021dabca52bb #v3.8.2
+        uses: sigstore/cosign-installer@398d4b0eeef1380460a10c8013a76f728fb906ac #v3.9.1
         with:
           cosign-release: 'v2.2.4'