diff --git a/vision_agent/utils/execute.py b/vision_agent/utils/execute.py
index 7633fa33..7967367e 100644
--- a/vision_agent/utils/execute.py
+++ b/vision_agent/utils/execute.py
@@ -243,7 +243,7 @@ def __str__(self) -> str:
             f"----- stdout -----\n{stdout_str}\n----- stderr -----\n{stderr_str}"
         )
 
-    def to_json(self) -> bytes:
+    def to_json(self) -> dict[str, list[str]]:
         return {"stdout": self.stdout, "stderr": self.stderr}