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 5000742..12df240 100644
--- a/src/test/java/video/api/client/api/clients/CaptionsApiTest.java
+++ b/src/test/java/video/api/client/api/clients/CaptionsApiTest.java
@@ -184,14 +184,14 @@ public void responseWithStatus200Test() throws ApiException {
         }
 
         @Test
-        @DisplayName("400 response")
+        @DisplayName("400-0 response")
         public void responseWithStatus400Test() throws ApiException {
-            answerOnAnyRequest(400, readResourceFile(PAYLOADS_PATH + "responses/400.json"));
+            answerOnAnyRequest(400, readResourceFile(PAYLOADS_PATH + "responses/400-0.json"));
 
-            assertThatThrownBy(() -> api.update("vi4k0jvEUuaTdRAEjQ4Prklg", "en", new CaptionsUpdatePayload()))
+            assertThatThrownBy(() -> api.update("vi4k0jvEUuaTdRAEjQ4Prklg", "en_", new CaptionsUpdatePayload()))
                     .isInstanceOf(ApiException.class)
                     .satisfies(e -> assertThat(((ApiException) e).getCode()).isEqualTo(400))
-                    .hasMessage("string (required)");
+                    .hasMessage("An attribute is invalid.");
         }
 
         @Test