diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 7859e1d..b1cd12b 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', 'truffleruby-head']
+        ruby-version: ['2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', 'truffleruby-head']
 
     steps:
     - uses: actions/checkout@v3