diff --git a/.travis.yml b/.travis.yml
index e3aa59c..cf316bc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,12 @@
 language: rust
 rust: stable
-os: osx
+matrix:
+  include:
+    - os: osx
+    - os: osx
+      osx_image: xcode7.2
+    - os: osx
+      osx_image: xcode9.4
 
 script:
   - cd core-foundation