diff --git a/book/_config.yml b/book/_config.yml
index 8e790c7..b54b01d 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -1,5 +1,5 @@
 title: TeachBooks Manual
-author: TeachBooks Development Team and TeachBooks users, built with <a href="https://teachbooks.io/">TeachBooks</a> and <a href="https://jupyterbook.org/">Jupyter Book</a>, <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="license noopener noreferrer"">CC BY 4.0<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/cc.svg" alt=""><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/by.svg" alt=""></a>
+author: TeachBooks Development Team and TeachBooks users, built with <a href="https://teachbooks.io/">TeachBooks</a>, <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="license noopener noreferrer"">CC BY 4.0<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/cc.svg" alt=""><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/by.svg" alt=""></a>
 
 execute:
   execute_notebooks: 'off'