diff --git a/changelog.rst b/changelog.rst
index 43e85fd..ff1d54d 100644
--- a/changelog.rst
+++ b/changelog.rst
@@ -2,6 +2,12 @@
  Changelog
 ===========
 
+0.43 (unreleased)
+=================
+
+- Nothing changed yet.
+
+
 0.42 (2018-06-19)
 =================
 
diff --git a/setup.py b/setup.py
index 1ed7266..c4cc387 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@ def _read_file(name):
 
 setup(
     name='azanium',
-    version='0.42',
+    version='0.43.dev0',
     url='http://www.wormmbase.org/',
     author='Matt Russell, EMBL-EBI',
     author_email='matthew.russell@wormbase.org',