diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 80418a6..d6accca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ ubuntu-20.04 ]
-        ruby: [ 2.0.0, 2.1, 2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, 3.2, jruby-9.3, jruby-9.4 ]
+        ruby: [ 2.0.0, 2.1, 2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, 3.2, 3.3, jruby-9.3, jruby-9.4 ]
         gemfile: [ Gemfile, Gemfile.rack-1.x ]
         exclude:
           - ruby: 2.0.0
@@ -22,7 +22,7 @@ jobs:
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/${{ matrix.gemfile }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - uses: ruby/setup-ruby@v1
       with: