diff --git a/docs_requirements.txt b/docs_requirements.txt
index 8dec818c..ff8d2adb 100644
--- a/docs_requirements.txt
+++ b/docs_requirements.txt
@@ -1,4 +1,4 @@
 m2r2
-sphinx
+sphinx <7
 sphinx-autodoc-typehints
 sphinx-rtd-theme