diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d3c39d..9078e7f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## [1.4.0](https://github.com/googleapis/python-test-utils/compare/v1.3.3...v1.4.0) (2023-11-29)
+## [1.4.0rc1](https://github.com/googleapis/python-test-utils/compare/v1.3.3...v1.4.0rc1) (2023-11-29)
 
 
 ### Features
diff --git a/setup.py b/setup.py
index 4889f28..bfe94b3 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@
 import os
 import setuptools  # type: ignore
 
-version = "1.4.0"
+version = "1.4.0rc1"
 
 package_root = os.path.abspath(os.path.dirname(__file__))