diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c6a941a..afd98ad7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-# Unreleased
+# Release 4.15.0rc1 (August 18, 2025)
 
 - Add the `@typing_extensions.disjoint_base` decorator, as specified
   in PEP 800. Patch by Jelle Zijlstra.
diff --git a/pyproject.toml b/pyproject.toml
index 66528698..ab058ad8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "flit_core.buildapi"
 # Project metadata
 [project]
 name = "typing_extensions"
-version = "4.14.1"
+version = "4.15.0rc1"
 description = "Backported and Experimental Type Hints for Python 3.9+"
 readme = "README.md"
 requires-python = ">=3.9"