diff --git a/modules/sandbox.py b/modules/sandbox.py
index 9442e03..8a58d7d 100644
--- a/modules/sandbox.py
+++ b/modules/sandbox.py
@@ -250,7 +250,7 @@ def run_tests(self, runner: str = "pytest", extra_args: Optional[list[str]] = No
             "--network=none",
             "--memory=512m",
             "--cpus=1",
-            "-v", f"{self.working_dir}:/workspace:ro",
+            "-v", f"{self.working_dir}:/workspace:rw",
             "-w", "/workspace",
             self.image,
             "sh", "-c", shlex.join(inner_cmd),