diff --git a/mesonbuild/coredata.py b/mesonbuild/coredata.py
index 2165f1816..e88cdc8e7 100644
--- a/mesonbuild/coredata.py
+++ b/mesonbuild/coredata.py
@@ -17,7 +17,7 @@ from pathlib import PurePath
 from .mesonlib import MesonException, commonpath
 from .mesonlib import default_libdir, default_libexecdir, default_prefix
 
-version = '0.39.0'
+version = '0.40.0.dev1'
 backendlist = ['ninja', 'vs2010', 'vs2015', 'xcode']
 
 class UserOption: