diff --git a/source-builder/sb/version.py b/source-builder/sb/version.py
index 296f717..721c459 100644
--- a/source-builder/sb/version.py
+++ b/source-builder/sb/version.py
@@ -83,7 +83,7 @@ import path
 #
 # Default to an internal string.
 #
-_version = '5'
+_version = '6'
 _revision = 'not_released'
 _version_str = '%s.%s' % (_version, _revision)
 _released = False