diff --git a/requirements.txt b/requirements.txt
index 6e411d8..fd296f6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ lxml==4.5.1
 Markdown==3.2.2
 nltk==3.5
 numpy==1.19.0
-protobuf==3.12.2
+protobuf==3.18.3
 python-dateutil==2.8.1
 python-docx==0.8.10
 regex==2020.6.8