diff --git a/BLL/requirements.txt b/BLL/requirements.txt
index 17da8b1..d2f4e00 100644
--- a/BLL/requirements.txt
+++ b/BLL/requirements.txt
@@ -24,7 +24,7 @@ nltk==3.5
 numpy==1.18.3
 oauthlib==3.1.0
 opt-einsum==3.2.1
-protobuf==3.11.3
+protobuf==3.15.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pytz==2020.1