1 files changed, 1 insertions, 1 deletions

diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index b3188ddd..8302a2dc 100644
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -1,5 +1,5 @@
 tox
-Sphinx
+Sphinx>=2,<4
 doc8
 docutils
 setuptools