diff --git a/requirements.txt b/requirements.txt
index 8f5ee72..a59a5a1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -28,7 +28,7 @@ numpy==1.17.2
 oauth2client==3.0.0
 pandas==1.0.1
 Pillow==5.2.0
-protobuf==3.6.1
+protobuf==3.18.3
 pyasn1==0.4.4
 pyasn1-modules==0.2.2
 pycryptodome==3.4.3