diff --git a/doc/en/requirements.txt b/doc/en/requirements.txt
index 5b49cb7fc..c907cbbd4 100644
--- a/doc/en/requirements.txt
+++ b/doc/en/requirements.txt
@@ -2,6 +2,6 @@ pallets-sphinx-themes
 pluggy>=1.0
 pygments-pytest>=2.2.0
 sphinx-removed-in>=0.2.0
-sphinx>=3.1,<4
+sphinx>=3.1
 sphinxcontrib-trio
 sphinxcontrib-svg2pdfconverter