diff --git a/requirements.txt b/requirements.txt
index f15f7fd..b4aa071 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ oauthlib==2.1.0
 olefile==0.46
 pexpect==4.6.0
 Pillow==6.2.1
-protobuf==3.6.1
+protobuf==3.18.3
 pycairo==1.16.2
 pycrypto==2.6.1
 pycups==1.9.73