diff --git a/requirements/docs.txt b/requirements/docs.txt
index 216df28..0ae26cb 100644
--- a/requirements/docs.txt
+++ b/requirements/docs.txt
@@ -1,4 +1,4 @@
-sphinx>=2.0, <3.0
+sphinx>=2.0, <5.0
 recommonmark  # fails with badges
 m2r  # fails with multi-line text
 nbsphinx