diff --git a/crates/primitives/src/signature/ecdsa_sig.rs b/crates/primitives/src/signature/ecdsa_sig.rs
index 3076b0a38..b4121542f 100644
--- a/crates/primitives/src/signature/ecdsa_sig.rs
+++ b/crates/primitives/src/signature/ecdsa_sig.rs
@@ -799,7 +799,7 @@ mod tests {
     #[cfg(feature = "rlp")]
     #[test]
     fn test_encode_and_decode() {
-        let signature: dyn Signature = EcdsaSignature::test_signature();
+        let signature = EcdsaSignature::test_signature();
 
         let mut encoded = Vec::new();
         signature.encode(&mut encoded);
diff --git a/crates/primitives/src/signature/super_signature.rs b/crates/primitives/src/signature/super_signature.rs
index 0cd18da24..4669b7ec8 100644
--- a/crates/primitives/src/signature/super_signature.rs
+++ b/crates/primitives/src/signature/super_signature.rs
@@ -1,4 +1,4 @@
-use crate::{Parity, U256};
+use crate::SignatureError;
 
 #[cfg(not(feature = "rlp"))]
 pub trait RlpSuperSig {}
@@ -16,11 +16,11 @@ pub trait K256SuperSig: From<(k256::ecdsa::Signature, k256::ecdsa::RecoveryId)>
 pub trait SerdeSuperSig {}
 
 #[cfg(feature = "serde")]
-pub trait SerdeSuperSig: serde::Serialize + serde::Deserialize {}
+pub trait SerdeSuperSig: serde::Serialize + for <'a>serde::Deserialize<'a> {}
 
 #[cfg(not(feature = "arbitrary"))]
 pub trait ArbitrarySuperSig {}
 
 #[cfg(feature = "arbitrary")]
 pub trait ArbitrarySuperSig:
-arbitrary::Arbitrary {}
\ No newline at end of file
+for <'a>arbitrary::Arbitrary<'a> {}
\ No newline at end of file