diff --git a/bopytex/scheduler.py b/bopytex/scheduler.py
index 212c726..1004136 100644
--- a/bopytex/scheduler.py
+++ b/bopytex/scheduler.py
@@ -31,12 +31,12 @@ class Scheduler:
         ]
 
     @property
-    def all_deps(self) -> list[str]:
+    def all_deps(self) -> set[str]:
         """List dependencies of all tasks"""
         return {d for task in self.tasks for d in task.deps}
 
     @property
-    def all_output(self) -> list[str]:
+    def all_output(self) -> set[str]:
         """List ouput of all tasks"""
         return {task.output for task in self.tasks}