diff --git a/packages/ckeditor5-dev-release-tools/lib/utils/getnpmtagfromversion.js b/packages/ckeditor5-dev-release-tools/lib/utils/getnpmtagfromversion.js
index 8044fdd52..1a86f9663 100644
--- a/packages/ckeditor5-dev-release-tools/lib/utils/getnpmtagfromversion.js
+++ b/packages/ckeditor5-dev-release-tools/lib/utils/getnpmtagfromversion.js
@@ -21,5 +21,9 @@ export default function getNpmTagFromVersion( version ) {
 		return 'nightly';
 	}
 
+	if ( versionTag.startsWith( 'internal' ) ) {
+		return 'internal';
+	}
+
 	return versionTag;
 }
diff --git a/packages/ckeditor5-dev-release-tools/tests/utils/getnpmtagfromversion.js b/packages/ckeditor5-dev-release-tools/tests/utils/getnpmtagfromversion.js
index 38b0c823b..a9980ec6c 100644
--- a/packages/ckeditor5-dev-release-tools/tests/utils/getnpmtagfromversion.js
+++ b/packages/ckeditor5-dev-release-tools/tests/utils/getnpmtagfromversion.js
@@ -3,13 +3,10 @@
  * For licensing, see LICENSE.md.
  */
 
-import { describe, it, expect, vi } from 'vitest';
-import semver from 'semver';
+import { describe, it, expect } from 'vitest';
 
 import getNpmTagFromVersion from '../../lib/utils/getnpmtagfromversion.js';
 
-vi.mock( 'semver' );
-
 describe( 'getNpmTagFromVersion()', () => {
 	it( 'should return "latest" when processing a X.Y.Z version', () => {
 		expect( getNpmTagFromVersion( '1.0.0' ) ).to.equal( 'latest' );
@@ -18,16 +15,16 @@ describe( 'getNpmTagFromVersion()', () => {
 	} );
 
 	it( 'should return "alpha" when processing a X.Y.Z-alpha.X version', () => {
-		vi.mocked( semver.prerelease ).mockReturnValue( [ 'alpha', 0 ] );
-
 		expect( getNpmTagFromVersion( '1.0.0-alpha.0' ) ).to.equal( 'alpha' );
 		expect( getNpmTagFromVersion( '2.1.0-alpha.0' ) ).to.equal( 'alpha' );
 		expect( getNpmTagFromVersion( '3.2.1-alpha.0' ) ).to.equal( 'alpha' );
 	} );
 
 	it( 'should return "nightly" when processing a 0.0.0-nightly-YYYYMMDD.X version', () => {
-		vi.mocked( semver.prerelease ).mockReturnValue( [ 'nightly', 0 ] );
-
 		expect( getNpmTagFromVersion( '0.0.0-nightly-20230517.0' ) ).to.equal( 'nightly' );
 	} );
+
+	it( 'should return "internal" when processing a 0.0.0-internal-YYYYMMDD.X version', () => {
+		expect( getNpmTagFromVersion( '0.0.0-internal-20230517.0' ) ).to.equal( 'internal' );
+	} );
 } );