diff --git a/CHANGES.rst b/CHANGES.rst
index aa741de..6b1d052 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,6 +4,10 @@ Change log
 This change log covers releases starting with version 3.0. For earlier
 releases, see the file `HISTORY.txt` in this folder.
 
+5.2 (unreleased)
+----------------
+
+
 5.1 (2023-10-03)
 ----------------
 - Catch ``ldap.UNAVAILABLE`` exception while connecting to an LDAP server.
diff --git a/setup.py b/setup.py
index 21b72c7..1d1c82b 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@ def read(name):
 
 
 setup(name='Products.LDAPUserFolder',
-      version='5.1',
+      version='5.2.dev0',
       description='A LDAP-enabled Zope user folder',
       long_description=read('README.rst'),
       classifiers=[