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
+
+Sphinx~=4.4.0
+doc8~=0.10.1
+docutils~=0.17.1
+reuse~=0.14.0
+sphinx-rtd-theme~=1.0.0
+sphinxcontrib-spelling~=7.3.2
+sphinx-multiversion~=0.2.4