diff --git a/cvat-core/src/download.worker.js b/cvat-core/src/download.worker.js
index 40542e0b848fa8e2b691bf616be6a6e3e39a3a99..5f1993e2e15248ec309dc9b265a3e3b770651f0d 100644
--- a/cvat-core/src/download.worker.js
+++ b/cvat-core/src/download.worker.js
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: MIT
 
-const Axios = require('axios');
+import Axios from 'axios';
 
 Axios.defaults.withCredentials = true;
 Axios.defaults.xsrfHeaderName = 'X-CSRFTOKEN';
diff --git a/cvat-core/src/project-implementation.ts b/cvat-core/src/project-implementation.ts
index bfdbdbe85f92b98234ed9d3f9ea1e7e88b2655fb..adcefe8f35e92a6699f446dd272eb74e62c5baa7 100644
--- a/cvat-core/src/project-implementation.ts
+++ b/cvat-core/src/project-implementation.ts
@@ -5,11 +5,11 @@
 
 import { Storage } from './storage';
 
-const serverProxy = require('./server-proxy').default;
-const { getPreview } = require('./frames');
+import serverProxy from './server-proxy';
+import { getPreview } from './frames';
 
-const Project = require('./project').default;
-const { exportDataset, importDataset } = require('./annotations');
+import Project from './project';
+import { exportDataset, importDataset } from './annotations';
 
 export default function implementProject(projectClass) {
     projectClass.prototype.save.implementation = async function () {
diff --git a/cvat-core/src/project.ts b/cvat-core/src/project.ts
index de10e7c4f0d86d6717dd830faf108d5a90bba97c..9cc5dd938ff0f96d2951beb5a4d575833dd1cb71 100644
--- a/cvat-core/src/project.ts
+++ b/cvat-core/src/project.ts
@@ -6,11 +6,11 @@
 import { StorageLocation } from './enums';
 import { Storage } from './storage';
 
-const PluginRegistry = require('./plugins').default;
-const { ArgumentError } = require('./exceptions');
-const { Label } = require('./labels');
-const User = require('./user').default;
-const { FieldUpdateTrigger } = require('./common');
+import PluginRegistry from './plugins';
+import { ArgumentError } from './exceptions';
+import { Label } from './labels';
+import User from './user';
+import { FieldUpdateTrigger } from './common';
 
 /**
  * Class representing a project