diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1ae9e218..8d35a222 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -60,7 +60,7 @@ jobs:
 
   test-on-osx:
     macos:
-      xcode: 15.0.0
+      xcode: 15.4.0
     steps:
       - with-brew-cache:
           steps:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 36de7789..faa89c14 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04, macos-13, macos-14]
+        os: [ubuntu-24.04, macos-15-intel, macos-15]
         crystal: [latest, nightly]
         include:
           - os: windows-2022