diff --git a/requirements.txt b/requirements.txt
index 21d581e..20b1c4f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ pandas==0.24.2
 parsel==1.5.1
 pbr==5.2.0
 pdfminer.six==20181108
-protobuf==3.7.1
+protobuf==3.18.3
 pyasn1==0.4.5
 pyasn1-modules==0.2.5
 pycodestyle==2.5.0