diff --git a/.github/workflows/docker-publish-v4.yml b/.github/workflows/docker-publish-v4.yml
index 8160e8a1..d49cd6b8 100644
--- a/.github/workflows/docker-publish-v4.yml
+++ b/.github/workflows/docker-publish-v4.yml
@@ -27,7 +27,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install cosign
-        uses: sigstore/cosign-installer@main
+        uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6 # v4.1.2
         with:
           cosign-release: 'v2.2.3'
 
diff --git a/.github/workflows/docker-publish.yml b/.github/workflows/docker-publish.yml
index 29e137d0..e938c490 100644
--- a/.github/workflows/docker-publish.yml
+++ b/.github/workflows/docker-publish.yml
@@ -39,7 +39,7 @@ jobs:
       # Install the cosign tool (not used on PR, still installed)
       # https://github.com/sigstore/cosign-installer
       - name: Install cosign
-        uses: sigstore/cosign-installer@main
+        uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6 # v4.1.2
         with:
           cosign-release: 'v2.2.3'