diff --git a/CHANGELOG.md b/CHANGELOG.md
index 776fc2e..e9cb796 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v1.4.0 (unreleased)
+
+- *Nothing for now.*
+
 ## v1.3.0
 
 - Added support for `.header.yml` config files.
diff --git a/pyproject.toml b/pyproject.toml
index 9681aaa..8bd075e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ prefer-active-python = true
 
 [tool.poetry]
 name = "unbeheader"
-version = "1.3.0"
+version = "1.4.0-dev"
 description = "Never fail to maintain your file headers"
 repository = "https://github.com/unconventionaldotdev/unbeheader"
 readme = "README.md"