diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3af16ea..9fbce67 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ All notable changes to this project are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) (as of version 1.4.0).
 
+## [Unreleased]
+
 ## [2.1.0] - 2024-08-09
 
 ### Added
diff --git a/javascript/package.json b/javascript/package.json
index ad988f6..255e4f0 100644
--- a/javascript/package.json
+++ b/javascript/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@openzim/wombat-setup",
   "type": "module",
-  "version": "2.1.0",
+  "version": "2.1.1-dev0",
   "license": "GPL-3.0-or-later",
   "author": "openZIM",
   "devDependencies": {
diff --git a/src/warc2zim/__about__.py b/src/warc2zim/__about__.py
index 9aa3f90..e3f9a93 100644
--- a/src/warc2zim/__about__.py
+++ b/src/warc2zim/__about__.py
@@ -1 +1 @@
-__version__ = "2.1.0"
+__version__ = "2.1.1-dev0"