diff --git a/docs/requirements.txt b/docs/requirements.txt
index fda2af35..0b93f7a8 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,4 +2,5 @@
     sphinx_autodoc_typehints
     sphinx_rtd_theme
     sphinx_gallery
-    sphinxcontrib_bibtex
\ No newline at end of file
+    sphinxcontrib_bibtex
+    Sphinx==6.1.3
\ No newline at end of file