diff --git a/requirements.txt b/requirements.txt
index 173dffe..ee19f8d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ Markdown==3.0.1
 MarkupSafe==1.1.0
 numpy==1.16.1
 Pillow==5.4.1
-protobuf==3.6.1
+protobuf==3.18.3
 PyYAML==3.13
 scipy==1.2.1
 six==1.12.0