diff --git a/testtools/__init__.py b/testtools/__init__.py
index fc2a372..6d838f6 100644
--- a/testtools/__init__.py
+++ b/testtools/__init__.py
@@ -122,4 +122,4 @@ else:
 # If the releaselevel is 'final', then the tarball will be major.minor.micro.
 # Otherwise it is major.minor.micro~$(revno).
 
-__version__ = (1, 7, 0, 'final', 0)
+__version__ = (1, 8, 0, 'dev', 0)