diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index 03a8419..0a140d0 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -150,7 +150,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [macos-latest, macos-11]
+        os: [macos-10.15, macos-11]
 
     steps:
     - name: Checkout repository