diff --git a/CHANGELOG.md b/CHANGELOG.md
index ddb7b3e0..0acbd8d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## [1.23.0](https://github.com/googleapis/proto-plus-python/compare/v1.22.3...v1.23.0) (2023-10-19)
+## [1.23.0rc1](https://github.com/googleapis/proto-plus-python/compare/v1.22.3...v1.23.0rc1) (2023-10-19)
 
 
 ### Features
diff --git a/setup.py b/setup.py
index 369e74f9..12ce04b9 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
 
 from setuptools import find_packages, setup
 
-version = "1.23.0"
+version = "1.23.0rc1"
 
 PACKAGE_ROOT = os.path.abspath(os.path.dirname(__file__))