diff --git a/requirements.txt b/requirements.txt
index 59fbca1..b96db04 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ googleapis-common-protos==1.5.3
 idna==2.7
 numpy==1.15.1
 pandas==0.23.4
-protobuf==3.6.1
+protobuf==3.15.0
 pyasn1==0.4.4
 pyasn1-modules==0.2.2
 python-dateutil==2.7.3