diff --git a/CHANGES.txt b/CHANGES.txt
index 58dff86..b45ceb6 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,6 +1,12 @@
 Changes
 =======
 
+5.2 (unreleased)
+----------------
+
+- Nothing changed yet.
+
+
 5.1 (2023-10-04)
 ----------------
 
diff --git a/setup.cfg b/setup.cfg
index 188e5b0..0a120a0 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -2,7 +2,7 @@
 name = tzlocal
 description = tzinfo object for the local timezone
 long_description = file: README.rst, CHANGES.txt
-version = 5.1
+version = 5.2.dev0
 author = Lennart Regebro
 author_email = regebro@gmail.com
 project_urls =