diff --git a/requirements.txt b/requirements.txt
index d90925b..e79e9f4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ matplotlib==3.1.1
 numpy==1.17.2
 ortools==7.3.7083
 pipenv==2018.11.26
-protobuf==3.9.2
+protobuf==3.18.3
 psycopg2==2.8.3
 pycparser==2.19
 PyJWT==1.7.1