diff --git a/config/config.devenv.json b/config/config.devenv.json
index 9ce3c3ae..5540b6a7 100644
--- a/config/config.devenv.json
+++ b/config/config.devenv.json
@@ -11,7 +11,7 @@
   "ssla": "https://static.element.io/legal/element-software-and-services-license-agreement-uk-1.pdf",
   "matrix_rtc_session": {
     "wait_for_key_rotation_ms": 3000,
-    "membership_event_expiry_ms": 6000000,
+    "membership_event_expiry_ms": 180000000,
     "delayed_leave_event_delay_ms": 18000,
     "delayed_leave_event_restart_ms": 4000,
     "network_error_retry_ms": 4000
diff --git a/config/config.sample.json b/config/config.sample.json
index f3a69d3e..7e9e5e15 100644
--- a/config/config.sample.json
+++ b/config/config.sample.json
@@ -14,7 +14,7 @@
   "ssla": "https://static.element.io/legal/element-software-and-services-license-agreement-uk-1.pdf",
   "matrix_rtc_session": {
     "wait_for_key_rotation_ms": 3000,
-    "membership_event_expiry_ms": 6000000,
+    "membership_event_expiry_ms": 180000000,
     "delayed_leave_event_delay_ms": 18000,
     "delayed_leave_event_restart_ms": 4000,
     "network_error_retry_ms": 4000
diff --git a/config/config_netlify_preview.json b/config/config_netlify_preview.json
index 7d03dc65..414dae87 100644
--- a/config/config_netlify_preview.json
+++ b/config/config_netlify_preview.json
@@ -8,7 +8,7 @@
   "ssla": "https://static.element.io/legal/element-software-and-services-license-agreement-uk-1.pdf",
   "matrix_rtc_session": {
     "wait_for_key_rotation_ms": 3000,
-    "membership_event_expiry_ms": 6000000,
+    "membership_event_expiry_ms": 180000000,
     "delayed_leave_event_delay_ms": 18000,
     "delayed_leave_event_restart_ms": 4000,
     "network_error_retry_ms": 4000