diff --git a/.travis.yml b/.travis.yml
index 0b08f1ad6..264b6f3bc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,7 @@
-osx_image: xcode8.3
+osx_image: xcode9.2
 language: objective-c
 xcode_project: Cog.xcodeproj
 xcode_scheme: Cog
+before_install:
+  - brew update
+  - brew outdated xctool || brew upgrade xctool