diff --git a/docker/.env.example b/docker/.env.example
index 3d2fc3eb3..ea3bb661b 100644
--- a/docker/.env.example
+++ b/docker/.env.example
@@ -234,7 +234,7 @@ export BUILTIN_CM_GEMINI_MODEL=""
 # Default using local
 # - sandbox: execute python code in a sandboxed env with deno + pyodide
 # - local: using venv, no env isolation
-export CODE_RUNNER_TYPE="local"
+export CODE_RUNNER_TYPE="sandbox"
 # Sandbox sub configuration
 # Access restricted to specific environment variables, split with comma, e.g. "PATH,USERNAME"
 export CODE_RUNNER_ALLOW_ENV=""