diff --git a/requirements.txt b/requirements.txt
index 98f0128..f0d714d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ Markdown==3.2.1
 #MarkupSafe==1.0
 nltk==3.4.5
 numpy==1.18.1
-protobuf==3.11.3
+protobuf==3.18.3
 pycparser==2.19
 PyYAML==5.3
 pytz==2020.4