diff --git a/package-lock.json b/package-lock.json
index 19c8b44..65b99da 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -30,7 +30,6 @@
         "firebase-admin": "^13.0.2",
         "jsdom": "^26.0.0",
         "jsonwebtoken": "^9.0.2",
-        "lodash": "^4.17.21",
         "object-hash": "^3.0.0",
         "reflect-metadata": "^0.2.2",
         "rxjs": "^7.8.1",
diff --git a/package.json b/package.json
index 96e9037..23b8802 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,6 @@
     "firebase-admin": "^13.0.2",
     "jsdom": "^26.0.0",
     "jsonwebtoken": "^9.0.2",
-    "lodash": "^4.17.21",
     "object-hash": "^3.0.0",
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.1",
diff --git a/src/schedule/internal/schedule-parser/schedule-parser.ts b/src/schedule/internal/schedule-parser/schedule-parser.ts
index c699573..2059b99 100644
--- a/src/schedule/internal/schedule-parser/schedule-parser.ts
+++ b/src/schedule/internal/schedule-parser/schedule-parser.ts
@@ -4,7 +4,6 @@ import * as XLSX from "xlsx";
 import { Range, WorkSheet } from "xlsx";
 import { toNormalString, trimAll } from "../../../utility/string.util";
 import { plainToInstance, Type } from "class-transformer";
-import * as objectHash from "object-hash";
 import LessonTime from "../../entities/lesson-time.entity";
 import { LessonType } from "../../enum/lesson-type.enum";
 import LessonSubGroup from "../../entities/lesson-sub-group.entity";
@@ -24,7 +23,8 @@ import {
 } from "class-validator";
 import { ClassProperties } from "../../../utility/class-trasformer/class-transformer-ctor";
 import { ToMap } from "create-map-transform-fn";
-import cloneDeep from "lodash/cloneDeep";
+
+import * as objectHash from "object-hash";
 
 type InternalId = {
 	/**
@@ -369,7 +369,7 @@ export class ScheduleParser {
 			});
 		})();
 
-		const cloneDays = () => cloneDeep(days);
+		const cloneDays = () => structuredClone(days);
 
 		for (const group of groups.values()) {
 			group.days.forEach((day, dayIndex) => {
@@ -391,7 +391,10 @@ export class ScheduleParser {
 							dayIndex
 						];
 
-						const lesson = cloneDeep(groupLesson) as TeacherLesson;
+						const lesson = structuredClone(
+							groupLesson,
+						) as TeacherLesson;
+
 						lesson.group = group.name;
 
 						teacherDay.lessons.push(lesson);