diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cf24f04..a5ee123 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -257,7 +257,7 @@ jobs:
 
           - toolset: clang
             cxxstd: "03,11,14,17,2a"
-            os: macos-10.15
+            os: macos-11
 
     timeout-minutes: 60
     runs-on: ${{matrix.os}}