diff --git a/requirements.txt b/requirements.txt
index 6db27b9..dae7653 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -75,7 +75,7 @@ ordereddict==1.1
 paramiko==2.0.9
 pexpect==3.1
 piston-mini-client==0.7.5
-protobuf==2.5.0
+protobuf==3.18.3
 pyOpenSSL==17.5.0
 pycrypto==2.6.1
 pycups==1.9.66