diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bfe7a0e2..7657baac 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,7 +51,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: '4.0.0'
         bundler-cache: true
     - name: Run rubocop
       run: bundle exec rake rubocop
diff --git a/.github/workflows/update_certs.yml b/.github/workflows/update_certs.yml
index 13c3e2fc..047b52ef 100644
--- a/.github/workflows/update_certs.yml
+++ b/.github/workflows/update_certs.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: '4.0.0'
         bundler-cache: true
     - name: Check k0s Certs
       id: check-certs-expired