diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 41aebb89..b24def82 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,7 +19,7 @@ jobs:
         # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
         ruby: [2.6, 2.7, '3.0', 3.1, 'jruby-9.3', truffleruby, truffleruby-head]
         include:
-          - { ruby: 3.1, rack: master, allow-failure: true }
+          - { ruby: 3.1, rack: main, allow-failure: true }
           - { ruby: jruby-head, rack: stable, allow-failure: true }
     env:
       rack: ${{ matrix.rack }}