diff --git a/requirements.txt b/requirements.txt
index d38b0df..9b696c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ oauth2client==3.0.0
 pandas==0.24.2
 pbr==5.2.0
 proto-google-cloud-datastore-v1==0.90.4
-protobuf==3.7.1
+protobuf==3.15.0
 pyarrow==0.11.1
 pyasn1==0.4.5
 pyasn1-modules==0.2.5