diff --git a/APIs-Backend/requirements.txt b/APIs-Backend/requirements.txt
index f5d5bfb..c3d2910 100644
--- a/APIs-Backend/requirements.txt
+++ b/APIs-Backend/requirements.txt
@@ -9,7 +9,7 @@ nltk==3.2.4
 numpy==1.13.1
 packaging==16.8
 pbr==3.1.1
-protobuf==3.1.0
+protobuf==3.18.3
 pymongo==3.4.0
 pyparsing==2.2.0
 pytz==2017.2