diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ffe2483..1490bac 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -291,9 +291,6 @@ jobs:
               - libc++-14-dev
               - libc++abi-14-dev
 
-          - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
-            os: macos-13
           - toolset: clang
             cxxstd: "03,11,14,17,20,2b"
             os: macos-14
@@ -568,7 +565,6 @@ jobs:
       matrix:
         include:
           - os: ubuntu-24.04
-          - os: macos-13
           - os: macos-14
           - os: macos-15
 
@@ -616,7 +612,6 @@ jobs:
       matrix:
         include:
           - os: ubuntu-24.04
-          - os: macos-13
           - os: macos-14
           - os: macos-15
 
@@ -674,7 +669,6 @@ jobs:
       matrix:
         include:
           - os: ubuntu-24.04
-          - os: macos-13
           - os: macos-14
           - os: macos-15