diff --git a/Makefile b/Makefile
index f785a23..8517d19 100644
--- a/Makefile
+++ b/Makefile
@@ -35,5 +35,5 @@
 	pyang --lint ./config-models/aether-2.1.x/files/yang/*.yang
 	pyang --lint ./config-models/aether-2.2.x/files/yang/*.yang
 	pyang --lint ./config-models/aether-3.x/files/yang/*.yang
-	pyang --lint ./config-models/aether-4.x/files/yang/*.yang
-	pyang --lint ./config-models/plproxy-1.x/files/yang/*.yang
+	pyang --lint --lint-ensure-hyphenated-names -W error ./config-models/aether-4.x/files/yang/*.yang -p ./config-models/aether-4.x/files/yang
+	pyang --lint --lint-ensure-hyphenated-names -W error ./config-models/plproxy-1.x/files/yang/*.yang -p ./config-models/plproxy-1.x/files/yang
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index f2a3656..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-# SPDX-FileCopyrightText: © 2021 Open Networking Foundation <support@opennetworking.org>
-# SPDX-License-Identifier: Apache-2.0
-pyang~=2.5.0