diff --git a/functions/speech-to-speech/package.json b/functions/speech-to-speech/package.json
index c0070aed6b..ed28774a9f 100644
--- a/functions/speech-to-speech/package.json
+++ b/functions/speech-to-speech/package.json
@@ -32,7 +32,7 @@
   "dependencies": {
     "@google-cloud/speech": "^2.1.0",
     "@google-cloud/storage": "^2.0.3",
-    "@google-cloud/text-to-speech": "^0.4.0",
+    "@google-cloud/text-to-speech": "^0.5.0",
     "@google-cloud/translate": "^2.1.2",
     "uuid": "^3.3.2"
   },