1 files changed, 1 insertions, 0 deletions

diff --git a/synapse/events/utils.py b/synapse/events/utils.py

index 4ab770dd5f..94f3f15f52 100644
--- a/synapse/events/utils.py
+++ b/synapse/events/utils.py
@@ -42,6 +42,7 @@ def prune_event(event):
         "auth_events",
         "origin",
         "origin_server_ts",
+        "membership",
     ]
 
     new_content = {}