diff --git a/requirements.txt b/requirements.txt
index f10ab31..0145948 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ Markdown==2.6.11
 numpy==1.14.3
 pip-autoremove==0.9.1
 pprint==0.1
-protobuf==3.5.2.post1
+protobuf==3.18.3
 PyYAML==5.1
 scipy==1.1.0
 six==1.11.0