diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 693d307..cea4eac 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: [ '3.0', '3.1', '3.4', '4.0' ]
+        ruby-version: [ '3.0', '3.1', '3.2', '3.3', '3.4', '4.0' ]
 
     steps:
     - uses: actions/checkout@v6