Bump version to 0.4-dev.
diff --git a/git-flow-version b/git-flow-version
index 93a0df2..e0b7663 100644
--- a/git-flow-version
+++ b/git-flow-version
@@ -36,7 +36,7 @@
 # policies, either expressed or implied, of Vincent Driessen.
 #
 
-GITFLOW_VERSION=0.3-dev
+GITFLOW_VERSION=0.4-dev
 
 usage() {
 	echo "usage: git flow version"