diff --git a/requirements.txt b/requirements.txt
index f5e6688..07225a9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,7 +47,7 @@ olefile==0.45.1
 pexpect==4.2.1
 Pillow==5.1.0
 pipenv==2018.11.26
-protobuf==3.11.3
+protobuf==3.18.3
 pycairo==1.16.2
 pycrypto==2.6.1
 pycups==1.9.73