Merge "Fix Sphinx version"

diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index b3188dd..8302a2d 100644 (file)
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -1,5 +1,5 @@
 tox
-Sphinx
+Sphinx>=2,<4
 doc8
 docutils
 setuptools