diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 64a2b4b..29f3c36 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,6 +15,7 @@ jobs:
         ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
         os: [ ubuntu-latest, macos-latest, windows-latest ]
         exclude:
+          - { os: macos-latest, ruby: 2.5 }
           - { os: windows-latest, ruby: truffleruby-head }
           - { os: windows-latest, ruby: truffleruby }
     runs-on: ${{ matrix.os }}