diff --git a/requirements.txt b/requirements.txt
index 4e439e3..d0d5f9b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ Markdown==3.1.1
 mccabe==0.6.1
 numpy==1.16.4
 opt-einsum==3.0.1
-protobuf==3.8.0
+protobuf==3.18.3
 pylint==2.3.1
 scikit-learn==0.21.2
 scipy==1.3.0