diff --git a/services/communication/synapse-rendered.yaml b/services/communication/synapse-rendered.yaml
index d4dc341..22b68cf 100644
--- a/services/communication/synapse-rendered.yaml
+++ b/services/communication/synapse-rendered.yaml
@@ -339,6 +339,7 @@ data:
     default_room_version: "11"
     experimental_features:
       msc3266_enabled: true
+      msc4108_enabled: true
       msc4143_enabled: true
       msc4222_enabled: true
     max_event_delay_duration: 24h
@@ -677,7 +678,7 @@ spec:
   template:
     metadata:
       annotations:
-        checksum/config: manual-rtc-enable-5
+        checksum/config: manual-rtc-enable-6
         checksum/secrets: ec9f3b254a562a0f0709461eb74a8cc91b8c1a2fb06be2594a131776c2541773
       labels:
         app.kubernetes.io/name: matrix-synapse