diff --git a/lower-constraints.txt b/lower-constraints.txt
index bddc7c4d..fb08b989 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -35,7 +35,7 @@ mccabe==0.2.1
 mock==2.0.0
 monotonic==0.6
 mox3==0.20.0
-msgpack-python==0.4.0
+msgpack-python==0.5.6
 netaddr==0.7.18
 netifaces==0.10.4
 networkx==1.10