diff --git a/keyserver/src/push/send.js b/keyserver/src/push/send.js
--- a/keyserver/src/push/send.js
+++ b/keyserver/src/push/send.js
@@ -492,6 +492,9 @@
   notification.payload.id = uniqueID;
   notification.payload.threadID = threadInfo.id;
   notification.payload.messageInfos = JSON.stringify(newRawMessageInfos);
+  if (codeVersion && codeVersion > 136) {
+    notification.mutableContent = true;
+  }
   if (collapseKey) {
     notification.collapseId = collapseKey;
   }