diff --git a/docs/changelog.md b/docs/changelog.md
index 31507afb..54a45a87 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,5 +1,12 @@
 # Changelog
 
+(v0_18a0)=
+## 0.18a0 (2024-11-13)
+
+Alpha support for **async models**. [#507](https://github.com/simonw/llm/issues/507)
+
+Multiple [smaller changes](https://github.com/simonw/llm/compare/0.17.1...0.18a0).
+
 (v0_17)=
 ## 0.17 (2024-10-29)
 
diff --git a/setup.py b/setup.py
index 24b5acd2..d06c9b2a 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import setup, find_packages
 import os
 
-VERSION = "0.17.1"
+VERSION = "0.18a0"
 
 
 def get_long_description():