diff --git a/.github/workflows/pr-build.yml b/.github/workflows/pr-build.yml
index cdd69d8b7..eff1b61a3 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@afeafc3d1ab54a631816aba4c914a0081c12ff2f # v1.310.0
         with:
-          ruby-version: 3.4.9
+          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 7fb4314df..41e00c9db 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@afeafc3d1ab54a631816aba4c914a0081c12ff2f # v1.310.0
         with:
-          ruby-version: 3.4.9
+          ruby-version: 4.0.5
 
       - name: Install and Build 🔧
         run: |