diff --git a/src/test/java/video/api/client/api/clients/CaptionsApiTest.java b/src/test/java/video/api/client/api/clients/CaptionsApiTest.java
index b3bf124..89d2869 100644
--- a/src/test/java/video/api/client/api/clients/CaptionsApiTest.java
+++ b/src/test/java/video/api/client/api/clients/CaptionsApiTest.java
@@ -192,12 +192,12 @@ public void responseWithStatus200Test() throws ApiException {
         @Test
         @DisplayName("400 response")
         public void responseWithStatus400Test() throws ApiException {
-            answerOnAnyRequest(400, readResourceFile(PAYLOADS_PATH + "responses/400.json"));
+            answerOnAnyRequest(400, readResourceFile(PAYLOADS_PATH + "responses/400-0.json"));
 
             ApiException e = assertThrows(ApiException.class,
-                    () -> api.update("vi4k0jvEUuaTdRAEjQ4Prklg", "en", new CaptionsUpdatePayload()));
+                    () -> api.update("vi4k0jvEUuaTdRAEjQ4Prklg", "en_", new CaptionsUpdatePayload()));
             assertThat(e.getCode()).isEqualTo(400);
-            assertThat(e).hasMessageThat().contains("string (required)");
+            assertThat(e).hasMessageThat().contains("An attribute is invalid.");
         }
 
         @Test