diff --git a/requirements.txt b/requirements.txt
index aaa4429..9242f16 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ google-resumable-media==0.3.2
 googleapis-common-protos==1.5.8
 idna==2.8
 numpy==1.16.1
-protobuf==3.6.1
+protobuf==3.15.0
 pyasn1==0.4.5
 pyasn1-modules==0.2.4
 python-dateutil==2.8.0