diff --git a/lib/file.js b/lib/file.js
index 993e06af..381ae5c5 100644
--- a/lib/file.js
+++ b/lib/file.js
@@ -105,12 +105,19 @@ class File extends EventEmitter {
   getBlob (cb) {
     if (typeof window === 'undefined') throw new Error('browser-only method')
     streamToBlob(this.createReadStream(), this._getMimeType())
-      .then(blob => cb(null, blob), cb)
+      .then(
+        blob => cb(null, blob),
+        err => cb(err)
+      )
   }
 
   getBlobURL (cb) {
     if (typeof window === 'undefined') throw new Error('browser-only method')
-    streamToBlobURL(this.createReadStream(), this._getMimeType(), cb)
+    streamToBlobURL(this.createReadStream(), this._getMimeType())
+      .then(
+        blobUrl => cb(null, blobUrl),
+        err => cb(err)
+      )
   }
 
   appendTo (elem, opts, cb) {
diff --git a/package.json b/package.json
index 7dbab051..d97f2999 100644
--- a/package.json
+++ b/package.json
@@ -65,7 +65,7 @@
     "simple-sha1": "^2.0.8",
     "speedometer": "^1.0.0",
     "stream-to-blob": "^2.0.0",
-    "stream-to-blob-url": "^2.1.0",
+    "stream-to-blob-url": "^3.0.0",
     "stream-with-known-length-to-buffer": "^1.0.0",
     "torrent-discovery": "^9.1.1",
     "torrent-piece": "^2.0.0",