diff --git a/.github/workflows/pr-build.yml b/.github/workflows/pr-build.yml
index 9bef2e3a3..894c345a4 100644
--- a/.github/workflows/pr-build.yml
+++ b/.github/workflows/pr-build.yml
@@ -26,7 +26,7 @@ jobs:
       - name: Set up Ruby 3.2
         uses: ruby/setup-ruby@d45b1a4e94b71acab930e56e79c6aa188764e7f9 # v1.316.0
         with:
-          ruby-version: 3.4.10
+          ruby-version: 4.0.5
 
       - name: Install and Build 🔧
         run: |
diff --git a/.github/workflows/site-build.yml b/.github/workflows/site-build.yml
index b7545433d..f74d76ec5 100644
--- a/.github/workflows/site-build.yml
+++ b/.github/workflows/site-build.yml
@@ -26,7 +26,7 @@ jobs:
       - name: Set up Ruby 3.2
         uses: ruby/setup-ruby@d45b1a4e94b71acab930e56e79c6aa188764e7f9 # v1.316.0
         with:
-          ruby-version: 3.4.10
+          ruby-version: 4.0.5
 
       - name: Install and Build 🔧
         run: |