diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 330eb2ec7..c2c2162b4 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -13,6 +13,5 @@ sphinx:
   configuration: docs/conf.py
 
 python:
-  version: 3.9
   install:
     - requirements: requirements_doc.txt
diff --git a/requirements_doc.txt b/requirements_doc.txt
index a091dce83..260ac5b11 100644
--- a/requirements_doc.txt
+++ b/requirements_doc.txt
@@ -1,4 +1,4 @@
 -r requirements_dev.txt
-sphinx>=7.1.0,<7.2.0
-sphinx-rtd-theme>=1.2.0,<1.3.0
+sphinx>=6.0.0,<7.0.0
+sphinx-rtd-theme>=1.0.0,<2.0.0
 jinja2<3.2.0