diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 2187246..213f69e 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -15,7 +15,7 @@ jobs:
         os:
           - ubuntu-20.04
           - windows-2019
-          - macos-10.15
+          - macos-11
         d:
           - "ldc-1.27.1"
           - "dmd-2.097.2"