diff --git a/requirements.txt b/requirements.txt
index e4c5836..0532690 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ numpy==1.19.2
 ortools==7.8.7959
 osqp==0.6.1
 Pillow==7.2.0
-protobuf==3.13.0
+protobuf==3.18.3
 pydot==1.4.1
 pyparsing==2.4.7
 python-dateutil==2.8.1