diff --git a/requirements.txt b/requirements.txt
index b5507b3..5529bc9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ multidict==4.5.2
 numpy==1.17.0
 oauth2client==4.1.3
 Pillow==6.0.0
-protobuf==3.8.0
+protobuf==3.15.0
 pyasn1==0.4.5
 pyasn1-modules==0.2.5
 pycryptodome==3.4.3