diff --git a/DEPRECATIONS.md b/DEPRECATIONS.md
new file mode 100644
index 000000000..5f447b8a5
--- /dev/null
+++ b/DEPRECATIONS.md
@@ -0,0 +1,11 @@
+# Deprecated APIs
+
+Modules exported by packages in the repository can be marked as deprecated when an improved alternative appears, our processes require updates, or the proposed API is unsafe.
+
+## List of deprecated API
+
+Below, you can find all deprecation codes used in the `ckeditor5-dev-*` packages.
+
+### DEP0001: `verifyPackagesPublishedCorrectly()`
+
+Since v45, the `verifyPackagesPublishedCorrectly()` function is no longer available as its responsibility has been merged with `publishPackages()`.
diff --git a/packages/ckeditor5-dev-release-tools/lib/index.js b/packages/ckeditor5-dev-release-tools/lib/index.js
index d056e3a1e..d547988d8 100644
--- a/packages/ckeditor5-dev-release-tools/lib/index.js
+++ b/packages/ckeditor5-dev-release-tools/lib/index.js
@@ -29,6 +29,7 @@ export { default as saveChangelog } from './utils/savechangelog.js';
 export { default as executeInParallel } from './utils/executeinparallel.js';
 export { default as validateRepositoryToRelease } from './utils/validaterepositorytorelease.js';
 export { default as checkVersionAvailability } from './utils/checkversionavailability.js';
+export { default as verifyPackagesPublishedCorrectly } from './tasks/verifypackagespublishedcorrectly.js';
 export { default as getNpmTagFromVersion } from './utils/getnpmtagfromversion.js';
 export { default as isVersionPublishableForTag } from './utils/isversionpublishablefortag.js';
 export { default as provideToken } from './utils/providetoken.js';
diff --git a/packages/ckeditor5-dev-release-tools/lib/tasks/verifypackagespublishedcorrectly.js b/packages/ckeditor5-dev-release-tools/lib/tasks/verifypackagespublishedcorrectly.js
new file mode 100644
index 000000000..31f27d76f
--- /dev/null
+++ b/packages/ckeditor5-dev-release-tools/lib/tasks/verifypackagespublishedcorrectly.js
@@ -0,0 +1,59 @@
+/**
+ * @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+import upath from 'upath';
+import { glob } from 'glob';
+import fs from 'fs-extra';
+import checkVersionAvailability from '../utils/checkversionavailability.js';
+
+/**
+ * Npm sometimes throws incorrect error 409 while publishing, while the package uploads correctly.
+ * The purpose of the script is to validate if packages that threw 409 are uploaded correctly to npm.
+ *
+ * @param {object} options
+ * @param {string} options.packagesDirectory Relative path to a location of packages to release.
+ * @param {string} options.version Version of the current release.
+ * @param {function} options.onSuccess Callback fired when function is successful.
+ * @returns {Promise}
+ */
+export default async function verifyPackagesPublishedCorrectly( options ) {
+	process.emitWarning(
+		'The `verifyPackagesPublishedCorrectly()` function is deprecated and will be removed in the upcoming release (v45). ' +
+		'Its responsibility has been merged with `publishPackages()`.',
+		{
+			type: 'DeprecationWarning',
+			code: 'DEP0001',
+			detail: 'https://github.com/ckeditor/ckeditor5-dev/blob/master/DEPRECATIONS.md#dep0001-verifypackagespublishedcorrectly'
+		}
+	);
+
+	const { packagesDirectory, version, onSuccess } = options;
+	const packagesToVerify = await glob( upath.join( packagesDirectory, '*' ), { absolute: true } );
+	const errors = [];
+
+	if ( !packagesToVerify.length ) {
+		onSuccess( 'No packages found to check for upload error 409.' );
+
+		return;
+	}
+
+	for ( const packageToVerify of packagesToVerify ) {
+		const packageJson = await fs.readJson( upath.join( packageToVerify, 'package.json' ) );
+
+		const isPackageVersionAvailable = await checkVersionAvailability( version, packageJson.name );
+
+		if ( isPackageVersionAvailable ) {
+			errors.push( packageJson.name );
+		} else {
+			await fs.remove( packageToVerify );
+		}
+	}
+
+	if ( errors.length ) {
+		throw new Error( 'Packages that were uploaded incorrectly, and need manual verification:\n' + errors.join( '\n' ) );
+	}
+
+	onSuccess( 'All packages that returned 409 were uploaded correctly.' );
+}
diff --git a/packages/ckeditor5-dev-release-tools/tests/index.js b/packages/ckeditor5-dev-release-tools/tests/index.js
index e68cf0267..dd4bb16b2 100644
--- a/packages/ckeditor5-dev-release-tools/tests/index.js
+++ b/packages/ckeditor5-dev-release-tools/tests/index.js
@@ -30,6 +30,7 @@ import {
 import executeInParallel from '../lib/utils/executeinparallel.js';
 import validateRepositoryToRelease from '../lib/utils/validaterepositorytorelease.js';
 import checkVersionAvailability from '../lib/utils/checkversionavailability.js';
+import verifyPackagesPublishedCorrectly from '../lib/tasks/verifypackagespublishedcorrectly.js';
 import getNpmTagFromVersion from '../lib/utils/getnpmtagfromversion.js';
 import isVersionPublishableForTag from '../lib/utils/isversionpublishablefortag.js';
 import provideToken from '../lib/utils/providetoken.js';
@@ -48,6 +49,7 @@ vi.mock( '../lib/tasks/push' );
 vi.mock( '../lib/tasks/publishpackages' );
 vi.mock( '../lib/tasks/updateversions' );
 vi.mock( '../lib/tasks/cleanuppackages' );
+vi.mock( '../lib/tasks/verifypackagespublishedcorrectly' );
 vi.mock( '../lib/utils/versions' );
 vi.mock( '../lib/utils/getnpmtagfromversion' );
 vi.mock( '../lib/utils/changelog' );
@@ -233,6 +235,13 @@ describe( 'dev-release-tools/index', () => {
 		} );
 	} );
 
+	describe( 'verifyPackagesPublishedCorrectly()', () => {
+		it( 'should be a function', () => {
+			expect( verifyPackagesPublishedCorrectly ).to.be.a( 'function' );
+			expect( index.verifyPackagesPublishedCorrectly ).to.equal( verifyPackagesPublishedCorrectly );
+		} );
+	} );
+
 	describe( 'isVersionPublishableForTag()', () => {
 		it( 'should be a function', () => {
 			expect( isVersionPublishableForTag ).to.be.a( 'function' );
diff --git a/packages/ckeditor5-dev-release-tools/tests/tasks/verifypackagespublishedcorrectly.js b/packages/ckeditor5-dev-release-tools/tests/tasks/verifypackagespublishedcorrectly.js
new file mode 100644
index 000000000..ce59981c8
--- /dev/null
+++ b/packages/ckeditor5-dev-release-tools/tests/tasks/verifypackagespublishedcorrectly.js
@@ -0,0 +1,92 @@
+/**
+ * @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { glob } from 'glob';
+import fs from 'fs-extra';
+import verifyPackagesPublishedCorrectly from '../../lib/tasks/verifypackagespublishedcorrectly.js';
+import checkVersionAvailability from '../../lib/utils/checkversionavailability.js';
+
+vi.mock( 'fs-extra' );
+vi.mock( '../../lib/utils/checkversionavailability' );
+vi.mock( 'glob' );
+
+describe( 'verifyPackagesPublishedCorrectly()', () => {
+	beforeEach( () => {
+		vi.spyOn( process, 'emitWarning' ).mockImplementation( () => {
+		} );
+		vi.mocked( fs ).remove.mockResolvedValue();
+		vi.mocked( fs ).readJson.mockResolvedValue();
+		vi.mocked( glob ).mockResolvedValue( [] );
+		vi.mocked( checkVersionAvailability ).mockResolvedValue();
+	} );
+
+	it( 'should not verify packages if there are no packages in the release directory', async () => {
+		const packagesDirectory = '/workspace/ckeditor5/release/npm';
+		const version = 'latest';
+		const onSuccess = vi.fn();
+
+		await verifyPackagesPublishedCorrectly( { packagesDirectory, version, onSuccess } );
+
+		expect( onSuccess ).toHaveBeenCalledExactlyOnceWith( 'No packages found to check for upload error 409.' );
+		expect( vi.mocked( checkVersionAvailability ) ).not.toHaveBeenCalled();
+	} );
+
+	it( 'should verify packages and remove them from the release directory on if their version are already taken', async () => {
+		vi.mocked( glob ).mockResolvedValue( [ 'package1', 'package2' ] );
+		vi.mocked( fs ).readJson
+			.mockResolvedValueOnce( { name: '@namespace/package1' } )
+			.mockResolvedValueOnce( { name: '@namespace/package2' } );
+
+		const packagesDirectory = '/workspace/ckeditor5/release/npm';
+		const version = 'latest';
+		const onSuccess = vi.fn();
+
+		await verifyPackagesPublishedCorrectly( { packagesDirectory, version, onSuccess } );
+
+		expect( vi.mocked( checkVersionAvailability ) ).toHaveBeenCalledWith( 'latest', '@namespace/package1' );
+		expect( vi.mocked( checkVersionAvailability ) ).toHaveBeenCalledWith( 'latest', '@namespace/package2' );
+		expect( vi.mocked( fs ).remove ).toHaveBeenCalledWith( 'package1' );
+		expect( vi.mocked( fs ).remove ).toHaveBeenCalledWith( 'package2' );
+
+		expect( onSuccess ).toHaveBeenCalledExactlyOnceWith( 'All packages that returned 409 were uploaded correctly.' );
+	} );
+
+	it( 'should not remove package from release directory when package is not available on npm', async () => {
+		vi.mocked( glob ).mockResolvedValue( [ 'package1', 'package2' ] );
+		vi.mocked( fs ).readJson
+			.mockResolvedValueOnce( { name: '@namespace/package1' } )
+			.mockResolvedValueOnce( { name: '@namespace/package2' } );
+		vi.mocked( checkVersionAvailability )
+			.mockResolvedValueOnce( true )
+			.mockResolvedValueOnce( false );
+
+		const packagesDirectory = '/workspace/ckeditor5/release/npm';
+		const version = 'latest';
+		const onSuccess = vi.fn();
+
+		await expect( verifyPackagesPublishedCorrectly( { packagesDirectory, version, onSuccess } ) )
+			.rejects.toThrow( 'Packages that were uploaded incorrectly, and need manual verification:\n@namespace/package1' );
+
+		expect( vi.mocked( fs ).remove ).toHaveBeenCalledExactlyOnceWith( 'package2' );
+	} );
+
+	it( 'should print a deprecation warning', async () => {
+		const packagesDirectory = '/workspace/ckeditor5/release/npm';
+		const version = 'latest';
+		const onSuccess = vi.fn();
+
+		await verifyPackagesPublishedCorrectly( { packagesDirectory, version, onSuccess } );
+
+		expect( vi.mocked( process.emitWarning ) ).toHaveBeenCalledExactlyOnceWith(
+			expect.any( String ),
+			expect.objectContaining( {
+				type: 'DeprecationWarning',
+				code: 'DEP0001',
+				detail: expect.stringContaining( 'dep0001' )
+			} )
+		);
+	} );
+} );