diff --git a/.github/workflows/darwin.yml b/.github/workflows/darwin.yml
index ffe474a..88e5437 100644
--- a/.github/workflows/darwin.yml
+++ b/.github/workflows/darwin.yml
@@ -11,7 +11,7 @@ jobs:
         config:
           # https://github.com/actions/virtual-environments/tree/main/images/macos
           - { os: "macos-11", xcode: "11.7", arch: "x64" }
-          - { os: "macos-12", xcode: "14.2", arch: "x64" }
+          - { os: "macos-13", xcode: "14.3", arch: "x64" }
     name: "xcode-${{matrix.config.xcode}}"
     steps:
       - name: Setup
diff --git a/develop/vendors/doctest b/develop/vendors/doctest
index b7c21ec..ae7a135 160000
--- a/develop/vendors/doctest
+++ b/develop/vendors/doctest
@@ -1 +1 @@
-Subproject commit b7c21ec5ceeadb4951b00396fc1e4642dd347e5f
+Subproject commit ae7a13539fb71f270b87eb2e874fbac80bc8dda2