update xcode for travisci

diff --git a/.travis.yml b/.travis.yml
index 18346c9..7c3dc0a 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,7 @@ os:
 compiler:
   - gcc
 
-osx_image: xcode11.3
+osx_image: xcode13.2
 
 addons:
   apt: