diff --git a/HISTORY.md b/HISTORY.md
index 55ff8cb57..3f5fffda1 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,12 @@
 
 # Release history
 
+### Aider v0.42.0
+
+- Performance release:
+  - 5X faster launch!
+  - Faster auto-complete in large git repos (users report ~100X speedup)!
+
 ### Aider v0.41.0
 
 - [Allow Claude 3.5 Sonnet to stream back >4k tokens!](https://aider.chat/2024/07/01/sonnet-not-lazy.html)
diff --git a/website/HISTORY.md b/website/HISTORY.md
index c8da5ea82..03ad6a5bb 100644
--- a/website/HISTORY.md
+++ b/website/HISTORY.md
@@ -12,6 +12,12 @@ cog.out(text)
 
 # Release history
 
+### Aider v0.42.0
+
+- Performance release:
+  - 5X faster launch!
+  - Faster auto-complete in large git repos (users report ~100X speedup)!
+
 ### Aider v0.41.0
 
 - [Allow Claude 3.5 Sonnet to stream back >4k tokens!](https://aider.chat/2024/07/01/sonnet-not-lazy.html)