diff --git a/.travis.yml b/.travis.yml
index 8ef86fef..c18d65f8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,9 @@
+sudo: false
 language: python
-script: tox
-install:
-  - pip install tox-travis
 python:
   - "3.5"
   - "3.6"
-matrix:
-  include:
-    - python: 3.7
-      dist: xenial
+  - "3.7"
+script: tox
+install:
+  - pip install tox-travis
diff --git a/dev-requirements.txt b/dev-requirements.txt
index 9fa2dc2a..9163cf81 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -3,4 +3,4 @@ tox
 pytest
 flake8
 Flask-Testing
-black
+black ; python_version >= '3.6'