diff --git a/docs/requirements.txt b/docs/requirements.txt
index 998dfcfe..96d62560 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
-Sphinx
+Sphinx!=1.8.0
 git+https://github.com/fabpot/sphinx-php.git
 sphinx_rtd_theme