diff --git a/requirements.txt b/requirements.txt
index 6bc00ab..edd3704 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ jws==0.1.3
 lazy-object-proxy==1.4.3
 mccabe==0.6.1
 oauth2client==3.0.0
-protobuf==3.14.0
+protobuf==3.15.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycparser==2.20