diff --git a/requirements.txt b/requirements.txt
index 72f6c37..292e2eb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -46,7 +46,7 @@ pep8==1.7.0
 pexpect==4.0.1
 Pillow==3.1.2
 piston-mini-client==0.7.5
-protobuf==2.6.1
+protobuf==3.18.3
 ptyprocess==0.5
 pyasn1==0.1.9
 pyasn1-modules==0.0.7