diff --git a/CHANGES.rst b/CHANGES.rst
index 5123af44..5e458e6f 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,9 @@
+Version 2.3.1
+-------------
+
+Unreleased
+
+
 Version 2.3.0
 -------------
 
diff --git a/src/flask/__init__.py b/src/flask/__init__.py
index aeaf9df1..77ac68fb 100644
--- a/src/flask/__init__.py
+++ b/src/flask/__init__.py
@@ -38,7 +38,7 @@ from .templating import render_template_string as render_template_string
 from .templating import stream_template as stream_template
 from .templating import stream_template_string as stream_template_string
 
-__version__ = "2.3.0"
+__version__ = "2.3.1.dev"
 
 
 def __getattr__(name):