diff --git a/requirements.txt b/requirements.txt
index a95d5693..89c30e29 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ Pygments>=1.6
 SQLAlchemy>=0.9.3
 Sphinx>=1.2.2,<2
 WTForms>=1.0.5
-Werkzeug>=0.9.4
+Werkzeug>=0.9.4,<1
 alarmdecoder>=1.13.4
 alembic>=0.6.4
 argparse>=1.2.1