diff --git a/backend/substrapp/docker_registry.py b/backend/substrapp/docker_registry.py
index 814664427..5a1a08232 100644
--- a/backend/substrapp/docker_registry.py
+++ b/backend/substrapp/docker_registry.py
@@ -53,7 +53,9 @@ def get_registry_auth() -> typing.Optional[DockerAuthDict]:
 
 def get_request_docker_api(
     path: str,
-    header_accept: str = "application/vnd.docker.distribution.manifest.v2+json,application/vnd.oci.image.manifest.v1+json",
+    header_accept: str = (
+        "application/vnd.docker.distribution.manifest.v2+json," "application/vnd.oci.image.manifest.v1+json"
+    ),
 ) -> dict:
     headers = {"Accept": header_accept}