Use newer image
diff --git a/.travis.yml b/.travis.yml
index ae48815..a32e30d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 os:
  - linux
  - osx
-osx_image: xcode7.1
+osx_image: xcode8.3
 sudo: false
 language: c
 addons: