Add Ruby 4.0 to tested versions

k0kubun · k0kubun · commit 5666e5d45d9b · 2026-01-13T11:12:22.000-08:00
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -20,6 +20,7 @@ jobs:
           - '3.2'
           - '3.3'
           - '3.4'
+          - '4.0'
           - ruby-head
 
     runs-on: ${{ matrix.os }}
