diff --git a/packages/hydrojudge/package.json b/packages/hydrojudge/package.json
index 9ebfffd09..0dc308558 100644
--- a/packages/hydrojudge/package.json
+++ b/packages/hydrojudge/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.1.24",
+    "version": "2.1.25",
     "main": "package.json",
     "author": "masnn",
     "repository": "https://github.com/hydro-dev/Hydro.git",
diff --git a/packages/hydrojudge/src/judge/default.ts b/packages/hydrojudge/src/judge/default.ts
index ce33e0e6f..dc0f33c9f 100644
--- a/packages/hydrojudge/src/judge/default.ts
+++ b/packages/hydrojudge/src/judge/default.ts
@@ -19,7 +19,7 @@ const Score = {
 function judgeCase(c) {
     return async (ctx, ctxSubtask) => {
         const { filename } = ctx.config;
-        const { copyIn } = ctx.execute;
+        const copyIn = { ...ctx.execute.copyIn };
         if (filename) copyIn[`${filename}.in`] = { src: c.input };
         const copyOut = filename ? [`${filename}.out`] : [];
         const stdin = filename ? null : c.input;
@@ -144,7 +144,7 @@ export const judge = async (ctx) => {
     ctx.total_memory_usage_kb = 0;
     ctx.total_time_usage_ms = 0;
     // sandbox seems cannot handle concurrent tasks with output file correctly
-    ctx.queue = new Queue({ concurrency: ctx.config.concurrency || (ctx.config.filename ? 1 : 2) });
+    ctx.queue = new Queue({ concurrency: ctx.config.concurrency || 2 });
     for (const sid in ctx.config.subtasks) tasks.push(judgeSubtask(ctx.config.subtasks[sid])(ctx));
     await Promise.all(tasks);
     ctx.stat.done = new Date();
diff --git a/packages/hydrojudge/src/judge/run.ts b/packages/hydrojudge/src/judge/run.ts
index 7c8c5e0b3..193d348b2 100644
--- a/packages/hydrojudge/src/judge/run.ts
+++ b/packages/hydrojudge/src/judge/run.ts
@@ -12,7 +12,7 @@ export const judge = async (ctx) => {
     ctx.execute = await compile(ctx.lang, ctx.code, 'code', {}, ctx.next);
     ctx.clean.push(ctx.execute.clean);
     ctx.next({ status: STATUS.STATUS_JUDGING, progress: 0 });
-    const { copyIn } = ctx.execute;
+    const copyIn = { ...ctx.execute.copyIn };
     const stdin = path.resolve(ctx.tmpdir, 'stdin');
     const stdout = path.resolve(ctx.tmpdir, 'stdout');
     const stderr = path.resolve(ctx.tmpdir, 'stderr');