diff --git a/.travis.yml b/.travis.yml
index db51748..97889cc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,15 +1,13 @@
 language: python
 python:
+ - '3.5'
  - '3.6'
-env:
- - TOX_ENV=py35
- - TOX_ENV=py36
- - TOX_ENV=py37
+ - '3.7'
 install:
  - pip install -r requirements_dev.txt
 before_script:
  - coverage erase
 script:
- - tox -e $TOX_ENV
+ - tox
 after_success:
  - coveralls
\ No newline at end of file
diff --git a/requirements_dev.txt b/requirements_dev.txt
index c1302f5..77209fb 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,4 +1,5 @@
 # Packages required for development and CI
 tox>=2.9.1
 tox-battery>=0.5
+tox-travis>=0.10
 python-coveralls>=2.9.1