diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7f2730a3..821b7de7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,12 +23,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        # No macOS on PRs, main or nightly: the org's 5 macOS slots are kept for release builds,
+        # and release.yml builds macOS (a failing release is fixed and rebuilt).
+        os: [ubuntu-latest, windows-latest]
     steps:
       - uses: actions/checkout@v4
 
       # The optional craft-fonts build input (Japanese fonts), so the Japanese font tests run on
-      # Linux; macOS and Windows test the build without it. See craftrules standards/fonts.md.
+      # Linux; Windows tests the build without it. See craftrules standards/fonts.md.
       - name: Check out craft-fonts (Linux)
         if: runner.os == 'Linux'
         uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0