diff --git a/.github/workflows/rubocop.yml b/.github/workflows/rubocop.yml
index e1430f0fa06..31d6a1a8360 100644
--- a/.github/workflows/rubocop.yml
+++ b/.github/workflows/rubocop.yml
@@ -21,7 +21,7 @@ jobs:
       matrix:
         # [ ubuntu, macos, windows ]
         os: [ windows ]
-        ruby: [ '2.5', '2.6', '2.7', '3.0', 'head' ]
+        ruby: [ '2.5', '2.6', '2.7', '3.0', '3.1', 'head' ]
         include:
           - { os: windows, ruby: mingw }
         exclude: