diff --git a/teachings.json b/teachings.json
index bf19aaa..d041fce 100644
--- a/teachings.json
+++ b/teachings.json
@@ -1101,7 +1101,7 @@
   },
   {
     "name": "Sistemi Operativi M",
-    "url": "ing-sistemi-informativi-m",
+    "url": "ing-sistemi-operativi-m",
     "chat": "https://chat.whatsapp.com/FSa1sct9vfQAElwGESW1YJ",
     "website": "468009",
     "professors": [