diff --git a/creyPY/fastapi/testing.py b/creyPY/fastapi/testing.py
index 21194d1..bd8a53f 100644
--- a/creyPY/fastapi/testing.py
+++ b/creyPY/fastapi/testing.py
@@ -41,7 +41,7 @@ class GenericClient(TestClient):
         re = self.c.post(
             url,
             files={"file": file},
-            headers=self.default_headers | {"Content-Type": "application/json"},
+            headers=self.default_headers,
             *args,
             **kwargs,
         )
diff --git a/creyPY/fastapi/testing_async.py b/creyPY/fastapi/testing_async.py
index 836e3f1..3e44c86 100644
--- a/creyPY/fastapi/testing_async.py
+++ b/creyPY/fastapi/testing_async.py
@@ -1,4 +1,5 @@
 import json
+
 from httpx import ASGITransport, AsyncClient
 
 
@@ -45,7 +46,7 @@ class AsyncGenericClient:
         re = await self.c.post(
             url,
             files={"file": file},
-            headers=self.default_headers | {"Content-Type": "application/json"},
+            headers=self.default_headers,
             *args,
             **kwargs,
         )