diff --git a/background/package.json b/background/package.json
index 9a409e84c..94c8a00eb 100644
--- a/background/package.json
+++ b/background/package.json
@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@google-cloud/firestore": "^5.0.0",
-    "@google-cloud/pubsub": "3.1.0",
+    "@google-cloud/pubsub": "4.3.3",
     "@google-cloud/storage": "^6.0.0",
     "express": "^4.16.4"
   },
diff --git a/background/server/package.json b/background/server/package.json
index 37aa26f83..e1000e833 100644
--- a/background/server/package.json
+++ b/background/server/package.json
@@ -11,7 +11,7 @@
   "license": "Apache-2.0",
   "dependencies": {
     "@google-cloud/firestore": "^5.0.0",
-    "@google-cloud/pubsub": "^3.0.0",
+    "@google-cloud/pubsub": "^4.0.0",
     "body-parser": "^1.19.0",
     "express": "^4.17.1",
     "handlebars": "^4.2.0",