diff --git a/src/Translator.php b/src/Translator.php
index 2426b25..6a5d708 100644
--- a/src/Translator.php
+++ b/src/Translator.php
@@ -171,6 +171,12 @@ public function translateText($texts, ?string $sourceLang, string $targetLang, a
         $this->checkStatusCode($response);
 
         list(, $content) = $response;
+
+        // Deepl API responses might have invalid UTF8 sequence
+        // @see https://github.com/DeepLcom/deepl-php/pull/43
+        mb_substitute_character(0xFFFD);
+        $content = mb_convert_encoding($content, 'UTF-8', 'UTF-8');
+
         try {
             $decoded = json_decode($content, true, 512, \JSON_THROW_ON_ERROR);
         } catch (JsonException $exception) {
diff --git a/tests/TranslateTextTest.php b/tests/TranslateTextTest.php
index de5658e..d7e2c40 100644
--- a/tests/TranslateTextTest.php
+++ b/tests/TranslateTextTest.php
@@ -37,6 +37,21 @@ public function testMultipleText(?ClientInterface $httpClient)
         $this->assertEquals('en', $result[1]->detectedSourceLang);
     }
 
+    /**
+     * @dataProvider provideHttpClient
+     */
+    public function testHandlingResponseWithInvalidUtf8(?ClientInterface $httpClient)
+    {
+        $this->needsRealServer();
+        $translator = $this->makeTranslator([TranslatorOptions::HTTP_CLIENT => $httpClient]);
+        $input = 'Portal<span></span>';
+        $result = $translator->translateText($input, 'en', 'fr', [
+            TranslateTextOptions::TAG_HANDLING => 'xml',
+            TranslateTextOptions::IGNORE_TAGS => 'notranslate',
+        ]);
+        $this->assertInstanceOf(TextResult::class, $result);
+    }
+
     /**
      * @dataProvider provideHttpClient
      */