diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 9060fac4..94ac6486 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,11 @@
 Toolium Changelog
 =================
 
+v3.3.1
+------
+
+*Release date: In development*
+
 v3.3.0
 ------
 
diff --git a/VERSION b/VERSION
index 15a27998..a427fcb3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.3.0
+3.3.1.dev0