diff --git a/requirements.txt b/requirements.txt
index 2dc7df1..7b7f9cc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ Markdown==3.2.1
 matplotlib==3.0.3
 numpy==1.16.0
 powerlaw==1.4.4
-protobuf==3.11.3
+protobuf==3.15.0
 pyparsing==2.4.6
 python-dateutil==2.8.1
 PyYAML==5.4