secp256k1 = { version = "0.24.0", default-features = false, features = ["recovery", "alloc"] }
num-traits = { version = "0.2.8", default-features = false }
bitcoin_hashes = { version = "0.11", default-features = false }
-hashbrown = { version = "0.11", optional = true }
+hashbrown = { version = "0.8", optional = true }
serde = { version = "1.0.118", optional = true }
[dev-dependencies]