diff --git a/etc/requirements_dev.txt b/etc/requirements_dev.txt
index 233d950f..f6102ffd 100644
--- a/etc/requirements_dev.txt
+++ b/etc/requirements_dev.txt
@@ -21,7 +21,7 @@ pyandoc==0.0.1
 scipy==0.12.0
 matplotlib==1.3.0
 # tornado and pyparsing are required by matplotlib
-tornado==3.1
+tornado==3.1.1
 pyparsing==2.0.1
 statsmodels==0.4.3
 patsy==0.1.0