diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b5b621e..033cb5a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,19 +10,19 @@ jobs:
   code-style:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.1.0
+          ruby-version: "3.3"
       - name: Gems cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/gems
-          key: gems-3.1.0-${{ hashFiles('*.gemspec', 'Gemfile') }}-${{ github.sha }}
+          key: gems-3.3-${{ hashFiles('*.gemspec', 'Gemfile') }}-${{ github.sha }}
           restore-keys: |
-            gems-3.1.0-${{ hashFiles('*.gemspec', 'Gemfile') }}-
-            gems-3.1.0-
+            gems-3.3-${{ hashFiles('*.gemspec', 'Gemfile') }}-
+            gems-3.3-
       - name: Install dependencies
         run: |
           gem install bundler
@@ -37,23 +37,26 @@ jobs:
       fail-fast: false
       matrix:
         ruby:
-          - "2.6.0"
-          - "2.6"
           - "2.7.0"
           - "2.7"
           - "3.0.0"
           - "3.0"
           - "3.1.0"
+          - "3.1"
+          - "3.2.0"
+          - "3.2"
+          - "3.3.0"
+          - "3.3"
           - ruby-head
-          - jruby-9.3
+          - jruby-9.4
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
       - name: Gems cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/gems
           key: gems-${{ matrix.ruby }}-${{ hashFiles('*.gemspec', 'Gemfile') }}-${{ github.sha }}
@@ -61,6 +64,13 @@ jobs:
             gems-${{ matrix.ruby }}-${{ hashFiles('*.gemspec', 'Gemfile') }}-
             gems-${{ matrix.ruby }}-
       - name: Install dependencies
+        if: ${{ startsWith(matrix.ruby, '2.') }}
+        run: |
+          gem install bundler -v 2.4.22
+          bundle config path ~/gems
+          bundle install --jobs 4 --retry 3
+      - name: Install dependencies
+        if: ${{ ! startsWith(matrix.ruby, '2.') }}
         run: |
           gem install bundler
           bundle config path ~/gems