diff --git a/doc/sphinx/_templates/numfocus.html b/doc/sphinx/_templates/numfocus.html
index f1db0f138..4567da33e 100644
--- a/doc/sphinx/_templates/numfocus.html
+++ b/doc/sphinx/_templates/numfocus.html
@@ -1,5 +1,5 @@
 <div id="numfocus">
 <h3>Donate to Cantera</h3>
-<a href="https://www.flipcause.com/secure/cause_pdetails/Mjk3MjU=">
+<a href="https://numfocus.salsalabs.org/donate-to-cantera/index.html">
 <img src="{{pathto("_static/powered_by_NumFOCUS.png", 1) }}" border="0" alt="NumFOCUS"/></a>
 </div>