diff --git a/setup.py b/setup.py
index 8a21bd04..1e8fd612 100755
--- a/setup.py
+++ b/setup.py
@@ -95,7 +95,7 @@ class PyTest(TestCommand):
 
 setup(
     name='raven',
-    version='5.8.0.dev0',
+    version='5.9.0.dev0',
     author='David Cramer',
     author_email='dcramer@gmail.com',
     url='https://github.com/getsentry/raven-python',