diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index f58350c..945e87a 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ ubuntu-22.04, ubuntu-20.04, macos-13, macos-12, macos-11 ]
-        ruby: [ ruby-head, 3.2, 3.1, '3.0', 2.7, 2.5, 2.2, jruby, truffleruby ]
+        ruby: [ ruby-head, 3.3, 3.2, 3.1, '3.0', 2.7, 2.5, 2.2, jruby, truffleruby ]
         exclude:
           - { os: ubuntu-22.04 , ruby:  2.2 }
     runs-on: ${{ matrix.os }}
@@ -56,7 +56,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ windows-2022, windows-2019 ]
-        ruby: [ mswin, mingw, ucrt, head, 3.2, 3.1, '3.0', 2.5, 2.4, 2.3, 2.2 ]
+        ruby: [ mswin, mingw, ucrt, head, 3.3, 3.2, 3.1, '3.0', 2.5, 2.4, 2.3, 2.2 ]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout