diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9843aafe..53dd6307 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -396,13 +396,13 @@ jobs:
           # MacOS, clang
           #------------------
           - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             os: macos-13
           - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             os: macos-14
           - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             os: macos-15
 
     timeout-minutes: 180