diff --git a/Cargo.toml b/Cargo.toml
index 0c3bf73..21d1471 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ serde = { version = "1.0", default-features = false, optional = true }
 
 [dev-dependencies]
 bincode = { version = "2", features = ["serde"] }
-criterion = "0.5"
+criterion = "0.8"
 rand = "0.8"
 
 [features]
diff --git a/benches/bench.rs b/benches/bench.rs
index 9a0ce28..d0a51f4 100644
--- a/benches/bench.rs
+++ b/benches/bench.rs
@@ -1,8 +1,9 @@
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, Criterion};
 use ibs::{
     gg,
     gg::{Identity, Signer, Verifier},
 };
+use std::hint::black_box;
 
 use rand::prelude::*;