diff --git a/ChangeLog.rst b/ChangeLog.rst
index 863c6b2..0f67502 100644
--- a/ChangeLog.rst
+++ b/ChangeLog.rst
@@ -1,3 +1,10 @@
+1.1.1rc1
+========
+
+Release Date: 2025-06-06
+
+* Update Cython to 3.1.1 and cibuildwheel to 2.23.3.
+
 1.1.0
 =====
 
diff --git a/docs/conf.py b/docs/conf.py
index ab0ad3c..28116cd 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -12,9 +12,9 @@
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-#import os
-#import sys
-#sys.path.insert(0, os.path.abspath('..'))
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('..'))
 
 # -- General configuration -----------------------------------------------------
 
diff --git a/msgpack/__init__.py b/msgpack/__init__.py
index b615105..b8d83da 100644
--- a/msgpack/__init__.py
+++ b/msgpack/__init__.py
@@ -4,8 +4,8 @@ import os
 from .exceptions import *  # noqa: F403
 from .ext import ExtType, Timestamp
 
-version = (1, 1, 0)
-__version__ = "1.1.0"
+version = (1, 1, 1, "rc1")
+__version__ = "1.1.1rc1"
 
 
 if os.environ.get("MSGPACK_PUREPYTHON"):