diff --git a/docs/conf.py b/docs/conf.py
index de14c68..ed0b94e 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -123,7 +123,7 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'sphinx_rtd_theme'
+html_theme = 'default'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 128a4ee..2806c16 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1 @@
-Sphinx>4.3
-sphinx-rtd-theme>=1
-ZConfig
-Zope
-tempstorage
+Sphinx