Prepare release 4.8.0 (#283)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b951278..58f0487 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# Release 4.8.0 (September 17, 2023)
+
+No changes since 4.8.0rc1.
+
 # Release 4.8.0rc1 (September 7, 2023)
 
 - Add `typing_extensions.Doc`, as proposed by PEP 727. Patch by
diff --git a/pyproject.toml b/pyproject.toml
index 3ba1581..b71e6d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@
 # Project metadata
 [project]
 name = "typing_extensions"
-version = "4.8.0rc1"
+version = "4.8.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
 readme = "README.md"
 requires-python = ">=3.8"