diff --git a/tockloader/_version.py b/tockloader/_version.py
index b518f6e..36efb6b 100644
--- a/tockloader/_version.py
+++ b/tockloader/_version.py
@@ -1 +1 @@
-__version__ = "1.12.0"
+__version__ = "1.13.0-dev"