diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 698636e..f343816 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -283,8 +283,14 @@ jobs:
               - libc++abi-15-dev
 
           - toolset: clang
-            cxxstd: "11,14,17,2a"
-            os: macos-11
+            cxxstd: "11,14,17,20,2b"
+            os: macos-12
+          - toolset: clang
+            cxxstd: "11,14,17,20,2b"
+            os: macos-13
+          - toolset: clang
+            cxxstd: "11,14,17,20,2b"
+            os: macos-14
 
     timeout-minutes: 15
     runs-on: ${{matrix.os}}