diff --git a/.github/workflows/boxes.yml b/.github/workflows/boxes.yml
index 0335e04..95ef034 100644
--- a/.github/workflows/boxes.yml
+++ b/.github/workflows/boxes.yml
@@ -52,7 +52,7 @@ jobs:
                   parallel: true
 
     build-macos:
-        runs-on: macos-latest
+        runs-on: macos-13
         env:
           BX_LEX: /usr/local/opt/flex/bin/flex
           BX_YACC: /usr/local/opt/bison/bin/bison