diff --git a/changelog.d/18648.bugfix b/changelog.d/18648.bugfix
new file mode 100644
index 0000000000..2522e1357e
--- /dev/null
+++ b/changelog.d/18648.bugfix
@@ -0,0 +1 @@
+Only include latest membership events for each user/room combination in a single incremental legacy sync response.
\ No newline at end of file