diff --git a/nirum/__init__.py b/nirum/__init__.py
index 98e2dc3..186931b 100644
--- a/nirum/__init__.py
+++ b/nirum/__init__.py
@@ -2,5 +2,5 @@
 ~~~~~~~~~~~~~~~
 
 """
-__version_info__ = 0, 3, 7
+__version_info__ = 0, 4, 0
 __version__ = '.'.join(str(v) for v in __version_info__)
diff --git a/setup.py b/setup.py
index 394bf00..2ac0653 100644
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,7 @@ def get_version():
 setup_requires = []
 service_requires = [
     # FIXME Test Werkzeug 0.9, 0.10, 0.11 as well
-    'Werkzeug >= 0.11, < 0.12',
+    'Werkzeug >= 0.11, < 1.0',
 ]
 install_requires = [
     'six', 'iso8601',