diff --git a/requirements.txt b/requirements.txt
index 2d76d78..5216e40 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,8 @@ sphinx
 sphinx-autobuild
 sphinxcontrib-httpdomain
 sphinx-jsonschema
-nbsphinx
+#nbsphinx
+lxml[html_clean]
 sphinx_rtd_theme
 recommonmark
 m2r
diff --git a/src/conf.py b/src/conf.py
index 0c2a5a6..bfa2ae9 100644
--- a/src/conf.py
+++ b/src/conf.py
@@ -56,7 +56,7 @@
     'sphinx.ext.githubpages',
     'sphinxcontrib.httpdomain',
     'sphinx-jsonschema',
-    'nbsphinx',
+    #'nbsphinx',
     'sphinx.ext.mathjax',
     "sphinxcontrib.youtube",
     # 'autoapi.extension',