diff --git a/backend/package.json b/backend/package.json
index 519f9e6c0..bca7deb6b 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -20,6 +20,7 @@
   "dependencies": {
     "@hyperswarm/dht": "^6.2.0",
     "apollo-server-express": "^2.25.2",
+    "await-semaphore": "^0.1.3",
     "axios": "^0.21.1",
     "class-validator": "^0.13.1",
     "cors": "^2.8.5",
diff --git a/backend/yarn.lock b/backend/yarn.lock
index 940906cfa..82bcd6b1f 100644
--- a/backend/yarn.lock
+++ b/backend/yarn.lock
@@ -1643,6 +1643,11 @@ asynckit@^0.4.0:
   resolved "https://registry.yarnpkg.com/asynckit/-/asynckit-0.4.0.tgz#c79ed97f7f34cb8f2ba1bc9790bcc366474b4b79"
   integrity sha1-x57Zf380y48robyXkLzDZkdLS3k=
 
+await-semaphore@^0.1.3:
+  version "0.1.3"
+  resolved "https://registry.yarnpkg.com/await-semaphore/-/await-semaphore-0.1.3.tgz#2b88018cc8c28e06167ae1cdff02504f1f9688d3"
+  integrity sha512-d1W2aNSYcz/sxYO4pMGX9vq65qOTu0P800epMud+6cYYX0QcT7zyqcxec3VWzpgvdXo57UWmVbZpLMjX2m1I7Q==
+
 axios@^0.21.1:
   version "0.21.4"
   resolved "https://registry.yarnpkg.com/axios/-/axios-0.21.4.tgz#c67b90dc0568e5c1cf2b0b858c43ba28e2eda575"