diff --git a/requirements.txt b/requirements.txt
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+# Base dependencies
+
+# Sync with readthedocs:
+# https://github.com/readthedocs/readthedocs.org/blob/master/requirements/pip.txt
+# https://github.com/readthedocs/readthedocs.org/blob/master/requirements/local-docs-build.txt
+sphinx==1.8.5  # pyup: <2.0.0
+sphinx_rtd_theme==0.4.3
+sphinx-notfound-page==0.6