diff --git a/.travis.yml b/.travis.yml
index 84c270a..d0aaa3b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -41,24 +41,22 @@ matrix:
     # OSX Clang
     - os: osx
       osx_image: xcode8
-      ruby: 2.3
       env:
         BUILD_TYPE=Release
         BIN_DIR=bin
       before_install:
         brew update
       install:
-        brew install cmake
+        brew upgrade cmake
     - os: osx
       osx_image: xcode8
-      ruby: 2.3
       env:
         BUILD_TYPE=Debug
         BIN_DIR=debug
       before_install:
         brew update
       install:
-        brew install cmake
+        brew upgrade cmake
 script:
     - cd build
     - cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE ..