diff --git a/.github/workflows/build-boxkit.yml b/.github/workflows/build-boxkit.yml
index 3c13d5d..b8da8e7 100644
--- a/.github/workflows/build-boxkit.yml
+++ b/.github/workflows/build-boxkit.yml
@@ -119,7 +119,7 @@ jobs:
             
       # Sign container
       - name: Install cosign
-        uses: sigstore/cosign-installer@v3.8.1
+        uses: sigstore/cosign-installer@v4.0.0
 
       - name: Sign latest container image
         if: github.event_name != 'pull_request'