diff --git a/requirements.txt b/requirements.txt
index 5947123..eaa02ed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,5 +25,5 @@ pyyaml==3.13
 pyzmq==18.0.1             # via zproc
 six==1.12.0               # via cryptography
 tblib==1.3.2              # via zproc
-werkzeug==0.14.1          # via flask
+werkzeug==0.15.3          # via flask
 zproc==0.9.4