diff --git a/Cargo.lock b/Cargo.lock
index d58fe23..b32ed95 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -572,7 +572,6 @@ dependencies = [
  "generic-ec",
  "k256",
  "key-share",
- "once_cell",
  "rand_core",
  "round-based",
  "serde",
diff --git a/givre/Cargo.toml b/givre/Cargo.toml
index 637b459..2a5cb49 100644
--- a/givre/Cargo.toml
+++ b/givre/Cargo.toml
@@ -23,8 +23,6 @@ sha2 = { version = "0.10", default-features = false, optional = true }
 
 serde = { version = "1", default-features = false, features = ["derive"], optional = true }
 
-once_cell = { version = "1", optional = true }
-
 [dev-dependencies]
 rand_core = { version = "0.6", default-features = false, features = ["getrandom"] }
 
@@ -46,4 +44,4 @@ hd-wallets = ["key-share/hd-wallets", "cggmp21-keygen?/hd-wallets"]
 all-ciphersuites = ["ciphersuite-secp256k1", "ciphersuite-ed25519", "ciphersuite-bitcoin"]
 ciphersuite-secp256k1 = ["generic-ec/curve-secp256k1", "k256", "sha2", "static_assertions"]
 ciphersuite-ed25519 = ["generic-ec/curve-ed25519", "sha2"]
-ciphersuite-bitcoin = ["ciphersuite-secp256k1", "dep:once_cell"]
+ciphersuite-bitcoin = ["ciphersuite-secp256k1"]
diff --git a/givre/src/lib.rs b/givre/src/lib.rs
index 4160d45..b3f46c5 100644
--- a/givre/src/lib.rs
+++ b/givre/src/lib.rs
@@ -20,7 +20,7 @@
 //! [CGGMP21]: https://github.com/dfns/cggmp21
 //! [draft]: https://www.ietf.org/archive/id/draft-irtf-cfrg-frost-15.html
 
-#![forbid(unsafe_code)]
+#![forbid(unsafe_code, unused_crate_dependencies)]
 #![deny(clippy::expect_used, clippy::unwrap_used, clippy::panic)]
 #![deny(missing_docs)]
 #![allow(clippy::type_complexity)]