diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index aecf6f1..6b2e9e6 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -17,8 +17,9 @@ jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        ruby-version: ["3.1", "3.2", "3.3", "3.4"]
+        ruby-version: ["3.1", "3.2", "3.3", "3.4", "4.0", "head" ]
 
     steps:
     - uses: actions/checkout@v4