diff --git a/requirements.txt b/requirements.txt
index 488229e..624c2ae 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ itsdangerous==0.24
 Jinja2==2.11.3
 MarkupSafe==0.23
 packaging==16.8
-protobuf==3.6.1
+protobuf==3.18.3
 pyparsing==2.1.10
 six==1.11.0
 tensorflow==2.4.0