diff --git a/setup.cfg b/setup.cfg
index 1c47fbb4..fca0d66d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -70,7 +70,6 @@ doc =
     tqdm
 jupyter =
     %(doc)s
-    aquirdturtle-collapsible-headings
     jupyterlab >=3.0
     jupyterlab-code-formatter
     jupyterlab-myst