diff --git a/requirements.txt b/requirements.txt
index 361c2c4..11edc08 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ mkl-random==1.0.2
 mkl-service==2.0.2
 numpy==1.16.4
 pip==19.2.2
-protobuf==3.8.0
+protobuf==3.18.3
 pydot==1.4.1
 pyparsing==2.4.2
 pyreadline==2.1