diff --git a/.travis.yml b/.travis.yml
index c130e5d..23ee855 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 ---
 sudo: required
 language: objective-c
-# 10.11 (see https://docs.travis-ci.com/user/osx-ci-environment/#OS-X-Version)
-osx_image: xcode7.3
+# 10.13 (see https://docs.travis-ci.com/user/osx-ci-environment/#OS-X-Version)
+osx_image: xcode9.3
 
 before_install:
   # Uninstall existing brew installation.