diff --git a/app/Http/Controllers/FederationController.php b/app/Http/Controllers/FederationController.php
index f498c7317..42988ec99 100644
--- a/app/Http/Controllers/FederationController.php
+++ b/app/Http/Controllers/FederationController.php
@@ -131,7 +131,7 @@ class FederationController extends Controller
 			'orderedItems' => []
 		];
 
-		return response(json_encode($res, JSON_UNESCAPED_SLASHES))->header('Content-Type', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"');
+		return response(json_encode($res, JSON_UNESCAPED_SLASHES))->header('Content-Type', 'application/activity+json');
 	}
 
 	public function userInbox(Request $request, $username)
diff --git a/app/Http/Controllers/InstanceActorController.php b/app/Http/Controllers/InstanceActorController.php
index 932155420..0eb796732 100644
--- a/app/Http/Controllers/InstanceActorController.php
+++ b/app/Http/Controllers/InstanceActorController.php
@@ -14,7 +14,7 @@ class InstanceActorController extends Controller
 			$res = (new InstanceActor())->first()->getActor();
 			return json_encode($res, JSON_UNESCAPED_SLASHES);
 		});
-		return response($res)->header('Content-Type', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"');
+		return response($res)->header('Content-Type', 'application/activity+json');
 	}
 
 	public function inbox()
@@ -32,6 +32,6 @@ class InstanceActorController extends Controller
 			'first' => config('app.url') . '/i/actor/outbox?page=true',
 			'last' =>  config('app.url') . '/i/actor/outbox?min_id=0page=true'
 		], JSON_UNESCAPED_SLASHES);
-		return response($res)->header('Content-Type', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"');
+		return response($res)->header('Content-Type', 'application/activity+json');
 	}
 }
diff --git a/app/Http/Controllers/ProfileController.php b/app/Http/Controllers/ProfileController.php
index 0810956b9..3f6795d5b 100644
--- a/app/Http/Controllers/ProfileController.php
+++ b/app/Http/Controllers/ProfileController.php
@@ -191,7 +191,7 @@ class ProfileController extends Controller
 			$fractal = new Fractal\Manager();
 			$resource = new Fractal\Resource\Item($user, new ProfileTransformer);
 			$res = $fractal->createData($resource)->toArray();
-			return response(json_encode($res['data']))->header('Content-Type', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"');
+			return response(json_encode($res['data']))->header('Content-Type', 'application/activity+json');
 		});
 	}
 
diff --git a/app/Http/Controllers/StatusController.php b/app/Http/Controllers/StatusController.php
index 040f2fdb1..117124bb9 100644
--- a/app/Http/Controllers/StatusController.php
+++ b/app/Http/Controllers/StatusController.php
@@ -293,7 +293,7 @@ class StatusController extends Controller
 		$resource = new Fractal\Resource\Item($status, $object);
 		$res = $fractal->createData($resource)->toArray();
 
-		return response()->json($res['data'], 200, ['Content-Type' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'], JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES);
+		return response()->json($res['data'], 200, ['Content-Type' => 'application/activity+json'], JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES);
 	}
 
 	public function edit(Request $request, $username, $id)
diff --git a/app/Util/ActivityPub/HttpSignature.php b/app/Util/ActivityPub/HttpSignature.php
index 5204a5f4b..8c8dad99f 100644
--- a/app/Util/ActivityPub/HttpSignature.php
+++ b/app/Util/ActivityPub/HttpSignature.php
@@ -132,7 +132,6 @@ class HttpSignature {
       '(request-target)' => 'post '.parse_url($url, PHP_URL_PATH),
       'Date' => $date->format('D, d M Y H:i:s \G\M\T'),
       'Host' => parse_url($url, PHP_URL_HOST),
-      'Accept' => 'application/activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
     ];
 
     if($digest) {