diff --git a/google_vision_api/requirements.txt b/google_vision_api/requirements.txt
index 95406910..dfe5eeb0 100644
--- a/google_vision_api/requirements.txt
+++ b/google_vision_api/requirements.txt
@@ -7,7 +7,7 @@ google-cloud-vision==0.42.0
 googleapis-common-protos==1.51.0
 grpcio==1.27.2
 idna==2.8
-protobuf==3.11.3
+protobuf==3.15.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pytz==2019.3