diff --git a/requirements.txt b/requirements.txt
index 47542d3a..af3e1062 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 flask==0.9
 werkzeug==0.8.3
-tornado>=4.0
+tornado==4.0.0
 sockjs-tornado>=1.0.0
 PyYAML==3.10
 Flask-Login==0.2.2