diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ee34900..bb19962 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -32,7 +32,6 @@ jobs:
         - { os: windows-2019, ruby: truffleruby }
         - { os: windows-2019, ruby: truffleruby-head }
         - { os: macos-11.0, ruby: truffleruby }
-        - { os: macos-11.0, ruby: truffleruby-head }
 
     name: ${{ matrix.os }} ${{ matrix.ruby }}
     runs-on: ${{ matrix.os }}