diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0461229..d7ff71d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.5, 2.6, 2.7, 3.0, 3.1, 3.2, 3.3, jruby-9.3, jruby-head]
+        ruby: [2.5, 2.6, 2.7, 3.0, 3.1, 3.2, 3.3, 3.4, jruby-9.3, jruby-head]
         test-group: [1, 2, 3, 4]
     name: Ruby ${{ matrix.ruby }}, test-group ${{ matrix.test-group }}
     steps: