diff --git a/.travis.yml b/.travis.yml
index 5ddebf978e861851dfde2ef8ecaebed848297f30..074380b7864b1810ce02ad5d7957255050f6ef85 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,7 @@ stages:
     if: tag =~ ^\d+\.\d+\.\d+$
 
 install:
-  - pip install tox
+  - pip install tox black
 
 jobs:
   include: