diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 90001616..0b5fe0af 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -98,7 +98,7 @@ jobs:
 
   macos:
     name: Build (macOS, Clang)
-    runs-on: macos-11.0
+    runs-on: macos-10.15
     steps:
       - name: Checkout
         uses: actions/checkout@v2.3.4