diff --git a/packages/lib/utils/replaceUnsupportedCharacters.test.ts b/packages/lib/utils/replaceUnsupportedCharacters.test.ts
index 7c48ec87515..8bc80f5ceab 100644
--- a/packages/lib/utils/replaceUnsupportedCharacters.test.ts
+++ b/packages/lib/utils/replaceUnsupportedCharacters.test.ts
@@ -2,7 +2,7 @@ import replaceUnsupportedCharacters from './replaceUnsupportedCharacters';
 
 describe('replaceUnsupportedCharacters', () => {
 	test('should replace NULL characters', () => {
-		expect(replaceUnsupportedCharacters('Test\x00...')).toBe('Test�...');
-		expect(replaceUnsupportedCharacters('\x00Test\x00...')).toBe('�Test�...');
+		expect(replaceUnsupportedCharacters('Test\x00...')).toBe('Test\uFFFD...');
+		expect(replaceUnsupportedCharacters('\x00Test\x00...')).toBe('\uFFFDTest\uFFFD...');
 	});
 });
diff --git a/tsconfig.json b/tsconfig.json
index 79e38e255db..eb2376e9305 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
     "compilerOptions": {
 		"module": "commonjs",
-		"target": "es2015",
+		"target": "es2017",
 		//"lib": ["es2015", "es2020.string", "dom", "dom.iterable"],
 		"alwaysStrict": true,
 		"forceConsistentCasingInFileNames": true,