diff --git a/.github/workflows/documentation.yaml b/.github/workflows/documentation.yaml
index 5a09c17..0dfe0d4 100644
--- a/.github/workflows/documentation.yaml
+++ b/.github/workflows/documentation.yaml
@@ -29,6 +29,8 @@ jobs:
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1.98.0
+        env:
+          GEM_REPO: "https://rubygems.org"
         with:
           ruby-version: '3.1'
           bundler-cache: true