diff --git a/requirements.txt b/requirements.txt
index 24c03a3..b998f4a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ Jinja2==2.10.1
 lazy-object-proxy==1.4.2
 MarkupSafe==1.1.1
 mccabe==0.6.1
-protobuf==3.9.1
+protobuf==3.15.0
 pyasn1==0.4.7
 pyasn1-modules==0.2.6
 pylint==2.3.1