diff --git a/requirements.txt b/requirements.txt
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index 0000000..16cdffa
--- /dev/null
+++ b/requirements.txt
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+Sphinx~=3.1.1
+doc8~=0.8.0
+reuse~=0.11.1
+sphinx-rtd-theme~=0.4.3
+sphinxcontrib-spelling~=4.3.0
+git+https://github.com/zdw/sphinx-multiversion@ec7c01cdaf2f9241245e84483dfb9bc0d0dffc62