diff --git a/requirements.txt b/requirements.txt
index bd168b5..717fe4d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ pytest>=3.3.1
 coveralls>=1.2.0
 coverage>=4.4.2
 dropbox>=8.5.0
+colour==0.1.5