diff --git a/server.go b/server.go
index 5067c98..109fa84 100644
--- a/server.go
+++ b/server.go
@@ -493,6 +493,7 @@ func listen(address string) {
 	tlsConfig := &tls.Config{
 		ClientAuth:         tls.RequestClientCert,
 		GetCertificate:     getCertificate,
+		MinVersion:         tls.VersionTLS12,
 		InsecureSkipVerify: true,
 	}