diff --git a/requirements.txt b/requirements.txt
index 02d71beed..8a63e6cb1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ picklable-itertools==0.1.1
 pillow==5.0.0
 progressbar2==3.34.3
 pyyaml==3.12
-pyzmq==16.0.3
+pyzmq==16.0.4
 requests==2.18.4
 scipy==1.0.0
 six==1.11.0