diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7cb9bd9..a9b79b8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '3.2', '3.1', '3.0', '2.7', '2.6', '2.5', 'jruby', 'truffleruby', 'truffleruby+graalvm' ]
+        ruby: [ '3.3', '3.2', '3.1', '3.0', '2.7', '2.6', '2.5', 'jruby', 'truffleruby', 'truffleruby+graalvm' ]
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -44,7 +44,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '3.2', '3.1', '3.0', '2.7', '2.6', '2.5' ]
+        ruby: [ '3.3', '3.2', '3.1', '3.0', '2.7', '2.6', '2.5' ]
     runs-on: macos-latest
     steps:
       - name: Checkout