diff --git a/dev-requirements.txt b/dev-requirements.txt
index 485b456..8231849 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,5 +1,5 @@
 pytest>=2.5
-sphinx>=1.1
+sphinx>=1.1,<1.5
 colour>=0.0.5
 mock>=1.0
 pycodestyle>=1.5.7