diff --git a/values_synapse.yaml b/values_synapse.yaml
index fa3b9af17e54ed9f136c10df59a596a5a3a0fdaa..d177fbf67452c7068a6f41e1ee4f4ab33941a76c 100644
--- a/values_synapse.yaml
+++ b/values_synapse.yaml
@@ -17,6 +17,9 @@ extraConfig:
   rc_message:
     per_second: 25
     burst_count: 250
+  rc_delayed_event_mgmt:
+    per_second: 1
+    burst_count: 20
   remote_media_download_per_second: 500K
   remote_media_download_burst_count: 2000M
   database:
@@ -61,7 +64,9 @@ extraConfig:
   server_notices:
     system_mxid_localpart: server
   experimental_features:
-    msc3030_enabled: true
+    msc3266_enabled: true
+    msc4222_enabled: true
+  max_event_delay_duration: 24h
 
 extraSecrets:
   oidc_providers: