diff --git a/requirements.txt b/requirements.txt
index 4dfc8d7..17b0b26 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ numpy==1.15.4
 oauth2client==4.1.3
 pandas==0.23.4
 Pillow==5.3.0
-protobuf==3.6.1
+protobuf==3.18.3
 pyasn1==0.4.4
 pyasn1-modules==0.2.2
 PyDrive==1.3.1