diff --git a/tokio-postgres/Cargo.toml b/tokio-postgres/Cargo.toml
index f3bf3338..0d399ae0 100644
--- a/tokio-postgres/Cargo.toml
+++ b/tokio-postgres/Cargo.toml
@@ -49,7 +49,7 @@ phf = "0.8"
 postgres-protocol = { version = "0.5.0", path = "../postgres-protocol" }
 postgres-types = { version = "0.1.0", path = "../postgres-types" }
 tokio = { version = "0.2", features = ["io-util"] }
-tokio-util = { version = "0.2", features = ["codec"] }
+tokio-util = { version = "0.3", features = ["codec"] }
 
 [dev-dependencies]
 tokio = { version = "0.2", features = ["full"] }
diff --git a/tokio-postgres/src/codec.rs b/tokio-postgres/src/codec.rs
index 2fae8bc1..9d078044 100644
--- a/tokio-postgres/src/codec.rs
+++ b/tokio-postgres/src/codec.rs
@@ -37,8 +37,7 @@ impl FallibleIterator for BackendMessages {
 
 pub struct PostgresCodec;
 
-impl Encoder for PostgresCodec {
-    type Item = FrontendMessage;
+impl Encoder<FrontendMessage> for PostgresCodec {
     type Error = io::Error;
 
     fn encode(&mut self, item: FrontendMessage, dst: &mut BytesMut) -> io::Result<()> {