diff --git a/doc/index.rst b/doc/index.rst
index 7e3a73dc..23ab3c7d 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -6,8 +6,6 @@ ODE-toolbox
 .. toctree::
    :hidden:
    :maxdepth: 1
-   :depth: 1
-   :local:
 
    index
 
diff --git a/doc/requirements.txt b/doc/requirements.txt
index d3bb2a0e..6319f062 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,7 +1,7 @@
 sympy
 scipy
 numpy
-sphinx>=6
+sphinx==6.2.1
 readthedocs-sphinx-ext
 sphinx-material
 sphinx-design