diff --git a/test/framework/src/main/java/org/elasticsearch/test/rest/ESRestTestCase.java b/test/framework/src/main/java/org/elasticsearch/test/rest/ESRestTestCase.java
index 4fe85b2875ec6..eb255be092157 100644
--- a/test/framework/src/main/java/org/elasticsearch/test/rest/ESRestTestCase.java
+++ b/test/framework/src/main/java/org/elasticsearch/test/rest/ESRestTestCase.java
@@ -2376,7 +2376,7 @@ public static void setIgnoredErrorResponseCodes(Request request, RestStatus... r
     }
 
     public static void addXContentBody(Request request, ToXContent body) throws IOException {
-        final var xContentType = randomFrom(XContentType.JSON, XContentType.CBOR, XContentType.YAML, XContentType.SMILE);
+        final var xContentType = XContentType.JSON;
         final var bodyBytes = XContentHelper.toXContent(body, xContentType, EMPTY_PARAMS, randomBoolean());
         request.setEntity(
             new InputStreamEntity(