diff --git a/docs/requirements.txt b/docs/requirements.txt
index eeda811..8f88277 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
-Sphinx>=7.0
+Sphinx>=6.0
 sphinx_rtd_theme>=1.2
 sphinxcontrib-phpdomain>=0.11
 breathe>=4.35