diff --git a/Cargo.toml b/Cargo.toml
index d8d2fe3b..a033d503 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,12 +33,12 @@ strobe = ["strobe-rs"]
 
 [dependencies]
 generic-array = "0.14.4"
-parity-scale-codec = { version = "1.3.5", optional = true, default-features = false, features = ["derive"] }
+parity-scale-codec = { version = "2.1.1", default-features = false, features = ["derive"], optional = true }
 quickcheck = { version = "0.9.2", optional = true }
 rand = { version = "0.7.3", optional = true }
-serde = { version = "1.0.116", optional = true, default-features = false, features = ["derive"] }
-multihash-derive = { version = "^0.7.1", path = "derive", default-features = false, optional = true }
-unsigned-varint = "0.7.0"
+serde = { version = "1.0.116", default-features = false, features = ["derive"], optional = true }
+multihash-derive = { version = "0.7.1", path = "derive", default-features = false, optional = true }
+unsigned-varint = { version = "0.7.0", default-features = false }
 
 blake2b_simd = { version = "0.5.10", default-features = false, optional = true }
 blake2s_simd = { version = "0.5.10", default-features = false, optional = true }
@@ -47,13 +47,11 @@ digest = { version = "0.9.0", default-features = false, optional = true }
 sha-1 = { version = "0.9.1", default-features = false, optional = true }
 sha-2 = { version = "0.9.0", default-features = false, optional = true, package = "sha2" }
 sha-3 = { version = "0.9.0", default-features = false, optional = true, package = "sha3" }
-strobe-rs = { version = "0.6.2", optional = true }
+strobe-rs = { version = "0.6.2", default-features = false, optional = true }
 
 [dev-dependencies]
 criterion = "0.3.3"
 hex = "0.4.2"
-quickcheck = "0.9.2"
-rand = "0.7.3"
 serde_json = "1.0.58"
 
 [[bench]]
diff --git a/src/multihash.rs b/src/multihash.rs
index 50339710..7bcc3830 100644
--- a/src/multihash.rs
+++ b/src/multihash.rs
@@ -181,12 +181,12 @@ impl<S: Size> From<Multihash<S>> for Vec<u8> {
 
 #[cfg(feature = "scale-codec")]
 impl parity_scale_codec::Encode for Multihash<crate::U32> {
-    fn encode_to<EncOut: parity_scale_codec::Output>(&self, dest: &mut EncOut) {
+    fn encode_to<EncOut: parity_scale_codec::Output + ?Sized>(&self, dest: &mut EncOut) {
         let mut digest = [0; 32];
         digest.copy_from_slice(&self.digest);
-        dest.push(&self.code);
-        dest.push(&self.size);
-        dest.push(&digest);
+        self.code.encode_to(dest);
+        self.size.encode_to(dest);
+        digest.encode_to(dest);
     }
 }
 
@@ -211,12 +211,12 @@ impl parity_scale_codec::Decode for Multihash<crate::U32> {
 
 #[cfg(feature = "scale-codec")]
 impl parity_scale_codec::Encode for Multihash<crate::U64> {
-    fn encode_to<EncOut: parity_scale_codec::Output>(&self, dest: &mut EncOut) {
+    fn encode_to<EncOut: parity_scale_codec::Output + ?Sized>(&self, dest: &mut EncOut) {
         let mut digest = [0; 64];
         digest.copy_from_slice(&self.digest);
-        dest.push(&self.code);
-        dest.push(&self.size);
-        dest.push(&digest);
+        self.code.encode_to(dest);
+        self.size.encode_to(dest);
+        digest.encode_to(dest);
     }
 }