diff --git a/src/matrix/room/AttachmentUpload.js b/src/matrix/room/AttachmentUpload.js
index dc25ce16..a66fbd45 100644
--- a/src/matrix/room/AttachmentUpload.js
+++ b/src/matrix/room/AttachmentUpload.js
@@ -89,6 +89,11 @@ export class AttachmentUpload {
             setPath(`${prefix}url`, content, this._mxcUrl);
         }
     }
+
+    dispose() {
+        this._unencryptedBlob.dispose();
+        this._transferredBlob.dispose();
+    }
 }
 
 function setPath(path, content, value) {
diff --git a/src/matrix/room/Room.js b/src/matrix/room/Room.js
index f2635492..4cf9106e 100644
--- a/src/matrix/room/Room.js
+++ b/src/matrix/room/Room.js
@@ -640,6 +640,7 @@ export class Room extends EventEmitter {
     dispose() {
         this._roomEncryption?.dispose();
         this._timeline?.dispose();
+        this._sendQueue.dispose();
     }
 }
 
diff --git a/src/matrix/room/sending/PendingEvent.js b/src/matrix/room/sending/PendingEvent.js
index a1e906ae..550cde8d 100644
--- a/src/matrix/room/sending/PendingEvent.js
+++ b/src/matrix/room/sending/PendingEvent.js
@@ -152,4 +152,12 @@ export class PendingEvent {
         this._status = SendStatus.Sent;
         this._emitUpdate("status");
     }
+
+    dispose() {
+        if (this._attachments) {
+            for (const attachment of Object.values(this._attachments)) {
+                attachment.dispose();
+            }
+        }
+    }
 }
diff --git a/src/matrix/room/sending/SendQueue.js b/src/matrix/room/sending/SendQueue.js
index aa3a29b9..4a678cfe 100644
--- a/src/matrix/room/sending/SendQueue.js
+++ b/src/matrix/room/sending/SendQueue.js
@@ -121,6 +121,7 @@ export class SendQueue {
             await txn.complete();
             this._pendingEvents.remove(idx);
         }
+        pendingEvent.dispose();
     }
 
     emitRemovals(pendingEvents) {
@@ -129,6 +130,7 @@ export class SendQueue {
             if (idx !== -1) {
                 this._pendingEvents.remove(idx);
             }
+            pendingEvent.dispose();
         }
     }
 
@@ -201,4 +203,10 @@ export class SendQueue {
         await txn.complete();
         return pendingEvent;
     }
+
+    dispose() {
+        for (const pe in this._pendingEvents.array) {
+            pe.dispose();
+        }
+    }
 }