diff --git a/requirements-dev.txt b/requirements-dev.txt
index 7e7d34b253..f9d980671d 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,7 +4,7 @@ pytest-cov>=2.12.1,<4
 pytest-timeout>=1.4.2,<3
 stubserver>=1.1,<2
 setuptools>=51.3.3,<59
-sphinx>=3.5.3,<4
+sphinx>=3.5.3,<7
 cwltest>=2.2.20211116163652
 mypy==0.931
 types-requests