diff --git a/requirements.txt b/requirements.txt
index 2ae20a71..85873a1a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ Pygments==2.1.1
 Sphinx==1.3.5
 Twisted-Core==13.2.0
 Twisted-Web==13.2.0
-Werkzeug==0.11.3
+Werkzeug==0.15.3
 adium-theme-ubuntu==0.3.4
 alabaster==0.7.7
 apt-xapian-index==0.45