diff --git a/.github/workflows/pr-build.yml b/.github/workflows/pr-build.yml
index 5f24089bc..7de2dd4b3 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@12fd324f1d0b43274fdc8130f6980590a667c455 # v1.312.0
         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 32bb90ecb..e7c9c127a 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@12fd324f1d0b43274fdc8130f6980590a667c455 # v1.312.0
         with:
-          ruby-version: 3.4.9
+          ruby-version: 4.0.5
 
       - name: Install and Build 🔧
         run: |