diff --git a/ssh/client.go b/ssh/client.go
index c976f0fef9..1298cde21c 100644
--- a/ssh/client.go
+++ b/ssh/client.go
@@ -47,6 +47,7 @@ const (
 
 var (
 	baseSSHArgs = []string{
+		"-o", "PasswordAuthentication=no",
 		"-o", "IdentitiesOnly=yes",
 		"-o", "StrictHostKeyChecking=no",
 		"-o", "UserKnownHostsFile=/dev/null",