diff --git a/.travis.yml b/.travis.yml
index a523ee1..8540f59 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ python:
 services:
   - docker
 install:
- - sudo apt-get install -y curl
+ - sudo apt-get install -y curl python-tk
  - sudo pip install -U pip
  - sudo curl -L https://github.com/docker/compose/releases/download/1.21.2/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
  - sudo chmod +x /usr/local/bin/docker-compose