diff --git a/requirements.txt b/requirements.txt
index 5591265..ec11123 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ oauth2client==3.0.0
 pandas==0.25.3
 pdfkit==0.6.1
 Pillow==7.0.0
-protobuf==3.11.2
+protobuf==3.15.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycryptodome==3.4.3