diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3e3e614c..12fa360e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
           - eMac
           - mercury
         os:
-          - macos-15
+          - macos-26
     steps:
       - name: Checkout code
         uses: actions/checkout@v4