diff --git a/changelogs/room_versions/3739.feature b/changelogs/room_versions/3739.feature
new file mode 100644
index 00000000..c20ec3ad
--- /dev/null
+++ b/changelogs/room_versions/3739.feature
@@ -0,0 +1 @@
+Update the default room version to 9.
\ No newline at end of file
diff --git a/content/rooms/_index.md b/content/rooms/_index.md
index 4c6faae1..f946cb61 100644
--- a/content/rooms/_index.md
+++ b/content/rooms/_index.md
@@ -51,7 +51,7 @@ stable and unstable periodically for a variety of reasons, including
 discovered security vulnerabilities and age.
 
 Clients should not ask room administrators to upgrade their rooms if the
-room is running a stable version. Servers SHOULD use **room version 6** as
+room is running a stable version. Servers SHOULD use **room version 9** as
 the default room version when creating new rooms.
 
 The available room versions are: