diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 0e38867..4469e5b 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -20,6 +20,11 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest]
         ruby: [2.5, 2.6, 2.7, 3.0, 3.1, 3.2, 3.3]
+        # CRuby < 2.6 does not support macos-arm64, so test those on amd64 instead
+        exclude:
+        - { os: macos-latest, ruby: '2.5' }
+        include:
+        - { os: macos-13, ruby: '2.5' }
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2