diff --git a/requirements.txt b/requirements.txt
index 933068a..1b9dd94 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -28,7 +28,7 @@ opt-einsum==3.1.0
 pandas==0.24.2
 parmap==1.5.2
 pomegranate==0.12.2
-protobuf==3.8.0
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pyparsing==2.4.0