diff --git a/.travis.yml b/.travis.yml
index 4ffb18c2ce5fa06a16a2b53f731c4a8f76dc5ad1..b66f387dad4e108004d406da7828cae9ea16a72b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,18 @@
 sudo: required
 os:
   - linux
+  dist: Xenial
   - osx
+   osx_image: xcode7.2
 language: python
 python:
   - "3.6"
   - "3.5"
   - "3.7"
+
+before_install:
+  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew update          ; fi
+
 install:
   - pip install -r requirements.txt
   - python setup.py install