diff --git a/CHANGES.rst b/CHANGES.rst
index 1f8c1a6..bce2f1a 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@
  Changes
 =========
 
+3.1.2 (unreleased)
+==================
+
+- Nothing changed yet.
+
+
 3.1.1 (2024-09-20)
 ==================
 
diff --git a/src/greenlet/__init__.py b/src/greenlet/__init__.py
index b2dcc9b..0d2a6ff 100644
--- a/src/greenlet/__init__.py
+++ b/src/greenlet/__init__.py
@@ -25,7 +25,7 @@
 ###
 # Metadata
 ###
-__version__ = '3.1.1'
+__version__ = '3.1.2.dev0'
 from ._greenlet import _C_API # pylint:disable=no-name-in-module
 
 ###