diff --git a/requirements.txt b/requirements.txt
index 4bcd110..75b5d95 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 git+https://github.com/fabpot/sphinx-php.git
+sphinx~=1.4.0
 sphinx-rtd-theme==0.1.6
 sphinxcontrib-spelling
 pyenchant