diff --git a/flask_server/requirements.txt b/flask_server/requirements.txt
index b102ee9..87547ba 100644
--- a/flask_server/requirements.txt
+++ b/flask_server/requirements.txt
@@ -21,7 +21,7 @@ MarkupSafe==1.1.1
 numpy==1.18.5
 oauthlib==3.1.0
 opt-einsum==3.2.1
-protobuf==3.12.2
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 requests==2.23.0