diff --git a/CHANGES.rst b/CHANGES.rst
index 082c7065..a992fc6b 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,9 @@
+Version 3.1.0
+-------------
+
+Unreleased
+
+
 Version 3.0.3
 -------------
 
diff --git a/pyproject.toml b/pyproject.toml
index bf14d157..64d51c32 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "Flask"
-version = "3.0.3"
+version = "3.1.0.dev"
 description = "A simple framework for building complex web applications."
 readme = "README.md"
 license = {file = "LICENSE.txt"}