diff --git a/requirements.txt b/requirements.txt
index 414cd66..526303a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ itsdangerous==1.1.0
 Jinja2==2.10
 MarkupSafe==1.1.0
 mongo==0.2.0
-protobuf==3.6.1
+protobuf==3.18.3
 pyasn1==0.4.4
 pyasn1-modules==0.2.2
 pymongo==3.7.2