diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 89aa07d..f7d0018 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.7, '3.0', 3.1, 3.2, 3.3, 3.4, jruby-9.4, jruby-10.0]
+        ruby: [2.7, '3.0', 3.1, 3.2, 3.3, 3.4, '4.0', jruby-9.4, jruby-10.0]
 
     steps:
       - name: Setup     
@@ -23,11 +23,12 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby }}
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
 
       - name: Install     
         run: |
-          bundle install --without docs     
+          bundle config set --local without 'docs'
+          bundle install
 
       - name: Test 
         run: bundle exec rake release:test
@@ -36,12 +37,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Set up Ruby 3.4
+      - name: Set up Ruby 4.0
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: '4.0'
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
 
       - name: Install gems
         run: bundle install