diff --git a/docs/conf.py b/docs/conf.py
index b1e9a64..039edec 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -22,7 +22,7 @@
 author = 'Robert Forkel'
 
 # The full version, including alpha/beta/rc tags
-release = '1.40.2'
+release = '1.40.3.dev0'
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/setup.cfg b/setup.cfg
index 8a1a1cd..fe5269b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = pycldf
-version = 1.40.2
+version = 1.40.3.dev0
 author = Robert Forkel
 author_email = robert_forkel@eva.mpg.de
 description = A python library to read and write CLDF datasets
diff --git a/src/pycldf/__init__.py b/src/pycldf/__init__.py
index ab8b1f3..f1d6f46 100644
--- a/src/pycldf/__init__.py
+++ b/src/pycldf/__init__.py
@@ -4,4 +4,4 @@
 from pycldf.terms import *
 
 # flake8: noqa
-__version__ = "1.40.2"
+__version__ = "1.40.3.dev0"