diff --git a/requirements.txt b/requirements.txt
index 1969011..748742c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ pdfminer.six==20181108
 Pillow==6.0.0
 pipenv==2018.11.26
 preshed==2.0.1
-protobuf==3.8.0
+protobuf==3.15.0
 pyasn1==0.4.5
 pyasn1-modules==0.2.5
 pycryptodome==3.8.2