diff --git a/.github/workflows/images_build.yml b/.github/workflows/images_build.yml
index 15ba73149..3fd7b7f33 100644
--- a/.github/workflows/images_build.yml
+++ b/.github/workflows/images_build.yml
@@ -140,6 +140,7 @@ jobs:
             github.com:443
             index.docker.io:443
             objects.githubusercontent.com:443
+            fulcio.sigstore.dev:443
             production.cloudflare.docker.com:443
             registry-1.docker.io:443
             yum.oracle.com:443