diff --git a/docs/requirements.txt b/docs/requirements.txt
index e0ad4d0..035ebe2 100755
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
-Sphinx<4
+Sphinx
 sphinx_rtd_theme
 breathe
 sphinxcontrib-mermaid