diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 3e2e56e..15ce7f9 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ ubuntu-22.04, ubuntu-20.04, macos-13, macos-12, macos-11, windows-2019, windows-2022 ]
-        ruby: [ head, 3.2, 3.1, '3.0', 2.7, 2.6, 2.5, 2.4, 2.3, 2.2, 2.1, '2.0' ]
+        ruby: [ head, 3.3, 3.2, 3.1, '3.0', 2.7, 2.6, 2.5, 2.4, 2.3, 2.2, 2.1, '2.0' ]
         include:
           - { os: ubuntu-20.04 , ruby: jruby    }
           - { os: ubuntu-20.04 , ruby: truffleruby      }