diff --git a/src/types/heartbeats.ts b/src/types/heartbeats.ts
index 6973414..4897eaa 100644
--- a/src/types/heartbeats.ts
+++ b/src/types/heartbeats.ts
@@ -28,9 +28,9 @@ export interface Datum {
 }
 
 export interface SendHeartbeat {
-  branch: string | null;
+  branch?: string | null;
   hostname: string;
-  project: string | null;
+  project?: string | null;
   url: string;
 }