diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f98da2c..f69aae3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, 3.2, 3.3, head, jruby-head, truffleruby-head]
+        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, 3.2, 3.3, 3.4.0-preview1, jruby-head, truffleruby-head, truffleruby+graalvm-head]
       fail-fast: false
     name: Ruby ${{ matrix.ruby }}
     runs-on: ubuntu-latest