diff --git a/requirements-python2.7-dev.txt b/requirements-python2.7-dev.txt
index 6b675514de0..4dcfd6cee03 100644
--- a/requirements-python2.7-dev.txt
+++ b/requirements-python2.7-dev.txt
@@ -28,4 +28,4 @@ twilio==6.3.dev0
 waitress==1.0a1
 WebOb==1.6.1
 WebTest==2.0.21
-Werkzeug==0.11.10
+Werkzeug==0.15.3
diff --git a/requirements-python3.4-dev.txt b/requirements-python3.4-dev.txt
index 325fc6b13e0..c3d03fa39d6 100644
--- a/requirements-python3.4-dev.txt
+++ b/requirements-python3.4-dev.txt
@@ -26,4 +26,4 @@ twilio==6.3.dev0
 waitress==1.0a1
 WebOb==1.6.1
 WebTest==2.0.21
-Werkzeug==0.11.10
+Werkzeug==0.15.3