diff --git a/packages/hydrojudge/langs.yaml b/packages/hydrojudge/langs.yaml
index 758e97478..d92e804d4 100644
--- a/packages/hydrojudge/langs.yaml
+++ b/packages/hydrojudge/langs.yaml
@@ -11,6 +11,7 @@ java:
     execute: /usr/bin/java -Dfile.encoding="UTF-8" -cp Main.jar Main
     time_limit_rate: 2
     compile_time_limit: 30000
+    compile_memory_limit: 1024
 py3:
     compile: /usr/bin/python3 -c "import py_compile; py_compile.compile('/w/foo.py', '/w/foo', doraise=True)"
     code_file: foo.py
@@ -19,14 +20,19 @@ php:
     execute: /usr/bin/php foo.php
 rs:
     compile: /usr/bin/rustc -O -o /w/foo /w/foo.rs
+    compile_time_limit: 30000
 hs:
     compile: /usr/bin/ghc -O -outputdir /tmp -o /w/foo /w/foo.hs
+    compile_time_limit: 30000
 js:
     execute: /usr/bin/jsc foo.js
 go:
     compile: /usr/bin/go build -o /w/foo /w/foo.go
+    compile_time_limit: 30000
 rb:
     execute: /usr/bin/ruby foo.rb
+    compile_time_limit: 30000
 cs:
     compile: /usr/bin/mcs csc -optimize+ -out:/w/foo.exe /w/foo.cs
-    execute: /usr/bin/mono foo.exe
\ No newline at end of file
+    execute: /usr/bin/mono foo.exe
+    compile_time_limit: 30000
diff --git a/packages/hydrojudge/package.json b/packages/hydrojudge/package.json
index eed35a3d2..b7bacf2eb 100644
--- a/packages/hydrojudge/package.json
+++ b/packages/hydrojudge/package.json
@@ -11,7 +11,7 @@
         "adm-zip": "0.5.14",
         "cac": "^6.7.14",
         "p-queue": "^8.1.0",
-        "schemastery": "^3.15.0",
+        "schemastery": "^3.16.0",
         "semver": "^7.7.1",
         "shell-quote": "^1.8.2",
         "superagent": "^10.1.1",
diff --git a/packages/hydrojudge/src/hosts/vj4.ts b/packages/hydrojudge/src/hosts/vj4.ts
index aa4afa149..9649ce147 100644
--- a/packages/hydrojudge/src/hosts/vj4.ts
+++ b/packages/hydrojudge/src/hosts/vj4.ts
@@ -5,7 +5,7 @@ import PQueue from 'p-queue';
 import superagent from 'superagent';
 import WebSocket from 'ws';
 import { JudgeResultBody, parseLang, STATUS } from '@hydrooj/common';
-import { fs, noop } from '@hydrooj/utils';
+import { findFileSync, fs, noop } from '@hydrooj/utils';
 import { getConfig } from '../config';
 import { FormatError, SystemError } from '../error';
 import { Session } from '../interface';
@@ -17,7 +17,7 @@ function removeNixPath(text: string) {
     return text.replace(/\/nix\/store\/[a-z0-9]{32}-/g, '/nix/');
 }
 
-const langs = parseLang(fs.readFileSync(path.resolve(__dirname, '../../langs.yaml'), 'utf-8'));
+const langs = parseLang(fs.readFileSync(process.env.VJ4_LANGS || findFileSync('@hydrooj/hydrojudge/langs.yaml'), 'utf-8'));
 
 export default class VJ4 implements Session {
     config: any;