diff --git a/docs/requirements.txt b/docs/requirements.txt
index 5ca090e..7cdb11c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -5,3 +5,4 @@ sphinx_copybutton>=0.5
 myst-nb==0.16.0
 # for syntax highlighting (https://nbsphinx.readthedocs.io/en/0.8.0/installation.html#Pygments-Lexer-for-Syntax-Highlighting)
 IPython>=8.0
+nbsphinx