diff --git a/requirements.txt b/requirements.txt
index ab4322b43..ed4c3d59d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ matplotlib
 #qml
 # tqdm
 # Developers tools for compiling documentation
-sphinx>=2.1.2
+sphinx>=2.1.2,<=4.0.2
 breathe>=4.14.1
 # Jinja2 v3 breaks nbsphinx
 jinja2==2.11.3