diff --git a/requirements.txt b/requirements.txt
index 340cebd..f13f039 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ idna==2.7
 itsdangerous==0.24
 Jinja2==2.10
 MarkupSafe==1.0
-protobuf==3.6.1
+protobuf==3.15.0
 pycparser==2.18
 requests>=2.20.0
 six==1.11.0