diff --git a/docs/requirements_docs.txt b/docs/requirements_docs.txt
index b6ec7d02fe1a2d99bf75c4abbf1c5252ae21e243..097d530a7672422159392076789ef6e0469461df 100644
--- a/docs/requirements_docs.txt
+++ b/docs/requirements_docs.txt
@@ -1,4 +1,4 @@
-sphinx==4.3.1
+sphinx==3.0.3
 sphinx-autoapi==1.8.4
 sphinx-autodoc-typehints==1.12.0
 sphinx-rtd-theme==0.4.3