diff --git a/teachings.json b/teachings.json
index 09d6615..d723fb9 100644
--- a/teachings.json
+++ b/teachings.json
@@ -212,7 +212,7 @@
   {
     "name": "Calcolo numerico",
     "url": "calcolo-numerico",
-    "chat": "t.me/joinchat/h1lypfBFdEZkYzFk",
+    "chat": "t.me/+hh3s35MljfgwYTU0",
     "website": "320581",
     "professors": ["elena.loli"]
   },