diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a2ca9f0..b5e90a2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,6 +16,7 @@ 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' }
           - { os: windows-latest, ruby: 'truffleruby-head' }
           - { os: windows-latest, ruby: 'jruby-head' }