diff --git a/doc-source/requirements.txt b/doc-source/requirements.txt
index 3e61db26..a64f1d66 100644
--- a/doc-source/requirements.txt
+++ b/doc-source/requirements.txt
@@ -3,7 +3,7 @@ default-values>=0.2.0
 domdf-sphinx-theme>=0.3.0
 extras-require>=0.2.0
 seed-intersphinx-mapping>=0.1.1
-sphinx<3.4.0,>=3.0.3
+sphinx>=3.0.3,<3.5.0
 sphinx-autofixture>=0.1.0
 sphinx-click>=2.5.0
 sphinx-copybutton>=0.2.12