diff --git a/.github/workflows/pr-build.yml b/.github/workflows/pr-build.yml
index a3a4c81d8..9a11a78f6 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@d5f787ce339eb0767271bc01d922e85644c2c8ab # v1.280.0
         with:
-          ruby-version: 3.4.8
+          ruby-version: 4.0.0
 
       - name: Install and Build 🔧
         run: |
diff --git a/.github/workflows/site-build.yml b/.github/workflows/site-build.yml
index 579f91940..cc0d4d0e6 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@d5f787ce339eb0767271bc01d922e85644c2c8ab # v1.280.0
         with:
-          ruby-version: 3.4.8
+          ruby-version: 4.0.0
 
       - name: Install and Build 🔧
         run: |