diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b855878..056ffd4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -350,14 +350,11 @@ jobs:
             install:
               - g++-13
 
-          - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
-            os: macos-13
           - toolset: clang
             cxxstd: "03,11,14,17,20,2b"
             os: macos-14
           - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "03,11,14,17,20,23"
             os: macos-15
 
     timeout-minutes: 45
@@ -666,7 +663,6 @@ jobs:
         include:
           - os: ubuntu-22.04
           - os: ubuntu-24.04
-          - os: macos-13
           - os: macos-14
           - os: macos-15
 
@@ -733,7 +729,6 @@ jobs:
         include:
           - os: ubuntu-22.04
           - os: ubuntu-24.04
-          - os: macos-13
           - os: macos-14
           - os: macos-15
 
@@ -810,7 +805,6 @@ jobs:
         include:
           - os: ubuntu-22.04
           - os: ubuntu-24.04
-          - os: macos-13
           - os: macos-14
           - os: macos-15