diff --git a/src/judge.rs b/src/judge.rs
index 64ce80d..c6348ab 100644
--- a/src/judge.rs
+++ b/src/judge.rs
@@ -6,8 +6,9 @@ use tokio::{
     fs,
     io::{AsyncReadExt, AsyncWriteExt},
 };
+use uuid::Uuid;
 
-use crate::{Language, Metrics, Resource, Sandbox, Verdict, util};
+use crate::{Language, Metrics, Resource, Sandbox, Verdict};
 
 const MAIN: &str = "main";
 const CHECKER: &str = "checker";
@@ -42,7 +43,7 @@ impl Judge<Created> {
         #[builder(default)] resource: Resource,
         #[builder(default)] time_limit: Duration,
     ) -> io::Result<Judge<Created>> {
-        let project_path = env::temp_dir().join(util::random(main.content).to_string());
+        let project_path = env::temp_dir().join(Uuid::new_v4().to_string());
         fs::create_dir(&project_path).await?;
 
         let main_path = project_path
diff --git a/src/lib.rs b/src/lib.rs
index 206dde8..65f1db5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,7 +2,6 @@ mod judge;
 pub mod language;
 mod metrics;
 mod sandbox;
-mod util;
 
 pub use judge::*;
 pub use language::Language;
diff --git a/src/sandbox/resource.rs b/src/sandbox/resource.rs
index 80dbc05..e90c83d 100644
--- a/src/sandbox/resource.rs
+++ b/src/sandbox/resource.rs
@@ -2,8 +2,7 @@ use std::{io, time::Duration};
 
 use byte_unit::Byte;
 use cgroups_rs::fs::{Cgroup, cgroup_builder::CgroupBuilder, hierarchies};
-
-use crate::util;
+use uuid::Uuid;
 
 const PREFIX: &str = "judge";
 
@@ -28,7 +27,7 @@ impl TryFrom<Resource> for Cgroup {
     type Error = io::Error;
 
     fn try_from(resource: Resource) -> Result<Self, Self::Error> {
-        let builder = CgroupBuilder::new(&format!("{}/{}", PREFIX, util::random(resource)));
+        let builder = CgroupBuilder::new(&format!("{}/{}", PREFIX, Uuid::new_v4()));
 
         let memory = resource.memory.as_u64() as i64;
         let builder = builder
diff --git a/src/util.rs b/src/util.rs
deleted file mode 100644
index fae314f..0000000
--- a/src/util.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-use std::hash::{DefaultHasher, Hash, Hasher};
-
-use uuid::Uuid;
-
-pub fn random<T: Hash>(data: T) -> u64 {
-    let mut hasher = DefaultHasher::default();
-    data.hash(&mut hasher);
-    Uuid::new_v4().hash(&mut hasher);
-
-    hasher.finish()
-}