diff --git a/explore/index.html b/explore/index.html
index d382efa..2adfb94 100644
--- a/explore/index.html
+++ b/explore/index.html
@@ -92,7 +92,7 @@
             </p>
             <br>
             <p>
-                <b><a href="https://server.exozy.me">Open CoCalc</a></b>: Collaborative calculation and data science powered by <a href="https://cocalc.com/">CoCalc</a>
+                <b><a href="https://calc.exozy.me">Open CoCalc</a></b>: Collaborative calculation and data science powered by <a href="https://cocalc.com/">CoCalc</a>
             </p>
             <br>
             <p>