diff --git a/requirements.txt b/requirements.txt
index 47885d725..1d03b008a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
-sphinx
+sphinx==1.2.2
 cloud_sptheme
 sphinxcontrib-blockdiag
 rst2pdf
 sphinxcontrib-actdiag
 sphinxcontrib-seqdiag
 sphinxcontrib-nwdiag
-sphinxcontrib-plantuml
\ No newline at end of file
+sphinxcontrib-plantuml