diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 05bdc14..e8ad7c7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -153,9 +153,6 @@ jobs:
             container: ubuntu:23.10
             os: ubuntu-latest
             install: clang-17
-          - toolset: clang
-            cxxstd: "03,11,14,17,2a"
-            os: macos-11
           - toolset: clang
             cxxstd: "03,11,14,17,20,2b"
             os: macos-12
@@ -283,7 +280,6 @@ jobs:
         include:
           - os: ubuntu-20.04
           - os: ubuntu-22.04
-          - os: macos-11
           - os: macos-12
           - os: macos-13
 
@@ -331,7 +327,6 @@ jobs:
         include:
           - os: ubuntu-20.04
           - os: ubuntu-22.04
-          - os: macos-11
           - os: macos-12
           - os: macos-13
 
@@ -389,7 +384,6 @@ jobs:
         include:
           - os: ubuntu-20.04
           - os: ubuntu-22.04
-          - os: macos-11
           - os: macos-12
           - os: macos-13