diff --git a/database/seeders/20241012193900-create-initial-user.cjs b/database/seeders/20241012193900-create-initial-user.cjs
index 0402e0e..3ab32f2 100644
--- a/database/seeders/20241012193900-create-initial-user.cjs
+++ b/database/seeders/20241012193900-create-initial-user.cjs
@@ -34,7 +34,7 @@ module.exports = {
       {
         ID_GURU: uuidv4(),
         ID: teacherId,
-        NIP: 1234567890123456,
+        NIP: "192049384959182948",
       },
     ]);
   },
diff --git a/models/usersModels/teacherModel.js b/models/usersModels/teacherModel.js
index d96102d..581883a 100644
--- a/models/usersModels/teacherModel.js
+++ b/models/usersModels/teacherModel.js
@@ -32,8 +32,8 @@ const TeacherModel = (DataTypes) => {
           notEmpty: true,
           is16Digits(value) {
             const stringValue = value.toString();
-            if (stringValue.length !== 16) {
-              throw new Error("NIP must be exactly 16 digits long");
+            if (stringValue.length !== 18) {
+              throw new Error("NIP must be exactly 18 digits long");
             }
           },
         },