diff --git a/setup.py b/setup.py
index 983f7611..b523edc4 100644
--- a/setup.py
+++ b/setup.py
@@ -71,7 +71,7 @@ setup(
     zip_safe=False,
     platforms='any',
     install_requires=[
-        'Werkzeug>=0.7',
+        'Werkzeug>=0.7,<1.0',
         'Jinja2>=2.4',
         'itsdangerous>=0.21',
         'click>=2.0',