diff --git a/src/matrix/room/BaseRoom.js b/src/matrix/room/BaseRoom.js
index 6f14b7f9..851e75c9 100644
--- a/src/matrix/room/BaseRoom.js
+++ b/src/matrix/room/BaseRoom.js
@@ -166,6 +166,16 @@ export class BaseRoom extends EventEmitter {
             if (this._observedEvents) {
                 this._observedEvents.updateEvents(entries);
             }
+            if (isTimelineOpen && decryption.hasUnverifiedSenders) {
+                // verify missing senders async and update timeline once done so we don't delay rendering with network requests
+                log.wrapDetached("fetch unknown senders keys", async () => {
+                    const newlyVerifiedDecryption = await decryption.fetchAndVerifyRemainingSenders(this._hsApi, log);
+                    const verifiedEntries = [];
+                    newlyVerifiedDecryption.applyToEntries(entries, entry => verifiedEntries.push(entry));
+                    this._timeline?.replaceEntries(verifiedEntries);
+                    this._observedEvents?.updateEvents(verifiedEntries);
+                });
+            }
         }, ensureLogItem(log));
         return request;
     }