diff --git a/HISTORY.md b/HISTORY.md
index 0926c14c3..a1f7df050 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,10 @@
 
 # Release history
 
+### v0.40.6
+
+- Fixed `/undo` so it works with `--no-attribute-author`.
+
 ### v0.40.5
 
 - Bump versions to pickup latest litellm to fix streaming issue with Gemini
diff --git a/website/HISTORY.md b/website/HISTORY.md
index 38625628f..f617fc5fd 100644
--- a/website/HISTORY.md
+++ b/website/HISTORY.md
@@ -12,6 +12,10 @@ cog.out(text)
 
 # Release history
 
+### v0.40.6
+
+- Fixed `/undo` so it works with `--no-attribute-author`.
+
 ### v0.40.5
 
 - Bump versions to pickup latest litellm to fix streaming issue with Gemini