diff --git a/src/hashes/ternary/kerl/bigint/i384/mod.rs b/src/hashes/ternary/kerl/bigint/i384/mod.rs
index 303678f..a3251cb 100644
--- a/src/hashes/ternary/kerl/bigint/i384/mod.rs
+++ b/src/hashes/ternary/kerl/bigint/i384/mod.rs
@@ -1,4 +1,4 @@
-// Copyright 2020-2021 IOTA Stiftung
+// Copyright 2024 IOTA Stiftung
 // SPDX-License-Identifier: Apache-2.0
 
 //! This module contains signed integers encoded by 384 bits.
diff --git a/src/hashes/ternary/kerl/bigint/macros.rs b/src/hashes/ternary/kerl/bigint/macros.rs
index 644fdcf..124fe80 100644
--- a/src/hashes/ternary/kerl/bigint/macros.rs
+++ b/src/hashes/ternary/kerl/bigint/macros.rs
@@ -1,4 +1,4 @@
-// Copyright 2020-2021 IOTA Stiftung
+// Copyright 2024 IOTA Stiftung
 // SPDX-License-Identifier: Apache-2.0
 
 macro_rules! def_and_impl_ternary {
diff --git a/src/hashes/ternary/kerl/bigint/u384/mod.rs b/src/hashes/ternary/kerl/bigint/u384/mod.rs
index bfb68f0..e479d6e 100644
--- a/src/hashes/ternary/kerl/bigint/u384/mod.rs
+++ b/src/hashes/ternary/kerl/bigint/u384/mod.rs
@@ -1,4 +1,4 @@
-// Copyright 2020-2021 IOTA Stiftung
+// Copyright 2024 IOTA Stiftung
 // SPDX-License-Identifier: Apache-2.0
 
 //! This module contains unsigned integers encoded by 384 bits.
diff --git a/src/keys/age.rs b/src/keys/age.rs
index ff296ac..5ea25e5 100644
--- a/src/keys/age.rs
+++ b/src/keys/age.rs
@@ -1,4 +1,4 @@
-// Copyright 2023 IOTA Stiftung
+// Copyright 2024 IOTA Stiftung
 // SPDX-License-Identifier: Apache-2.0
 
 // https://age-encryption.org/v1
diff --git a/src/keys/bip39.rs b/src/keys/bip39.rs
index eb4f447..7237d65 100644
--- a/src/keys/bip39.rs
+++ b/src/keys/bip39.rs
@@ -1,4 +1,4 @@
-// Copyright 2020 IOTA Stiftung
+// Copyright 2024 IOTA Stiftung
 // SPDX-License-Identifier: Apache-2.0
 
 // https://en.bitcoin.it/wiki/BIP_0039
diff --git a/src/keys/slip10.rs b/src/keys/slip10.rs
index 195c0d7..cacf01f 100644
--- a/src/keys/slip10.rs
+++ b/src/keys/slip10.rs
@@ -1,4 +1,4 @@
-// Copyright 2020-2023 IOTA Stiftung
+// Copyright 2024 IOTA Stiftung
 // SPDX-License-Identifier: Apache-2.0
 
 #![allow(clippy::from_over_into)]
diff --git a/src/signatures/ed25519.rs b/src/signatures/ed25519.rs
index 82a259c..bfdc1e5 100644
--- a/src/signatures/ed25519.rs
+++ b/src/signatures/ed25519.rs
@@ -1,4 +1,4 @@
-// Copyright 2020 IOTA Stiftung
+// Copyright 2024 IOTA Stiftung
 // SPDX-License-Identifier: Apache-2.0
 
 use core::{
diff --git a/tests/ed25519.rs b/tests/ed25519.rs
index 71c747f..426bf79 100644
--- a/tests/ed25519.rs
+++ b/tests/ed25519.rs
@@ -1,4 +1,4 @@
-// Copyright 2021 IOTA Stiftung
+// Copyright 2024 IOTA Stiftung
 // SPDX-License-Identifier: Apache-2.0
 
 #![cfg(feature = "ed25519")]