diff --git a/.travis.yml b/.travis.yml
index cffa8b3..e5d7d2b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,8 +18,6 @@ matrix:
     - os: linux
       dist: xenial
       compiler: clang
-    - os: osx
-      osx_image: xcode9.4
     - os: osx
       osx_image: xcode10
     - os: osx