diff --git a/requirements.txt b/requirements.txt
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+# SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
+# SPDX-License-Identifier: Apache-2.0
+PyYAML~=5.3.1
+jsonpath-ng~=1.5.1
+Jinja2~=2.11.2