diff --git a/sasl/Cargo.toml b/sasl/Cargo.toml
index af0f340e..225e9f7d 100644
--- a/sasl/Cargo.toml
+++ b/sasl/Cargo.toml
@@ -9,6 +9,7 @@ documentation = "https://docs.rs/sasl"
 readme = "README.md"
 keywords = ["sasl", "authentication"]
 license = "LGPL-3.0+"
+edition = "2018"
 
 [badges]
 gitlab = { repository = "lumi/sasl-rs" }
diff --git a/sasl/src/client/mechanisms/anonymous.rs b/sasl/src/client/mechanisms/anonymous.rs
index d95245a8..45361377 100644
--- a/sasl/src/client/mechanisms/anonymous.rs
+++ b/sasl/src/client/mechanisms/anonymous.rs
@@ -1,7 +1,7 @@
 //! Provides the SASL "ANONYMOUS" mechanism.
 
-use client::Mechanism;
-use common::{Credentials, Secret};
+use crate::client::Mechanism;
+use crate::common::{Credentials, Secret};
 
 /// A struct for the SASL ANONYMOUS mechanism.
 pub struct Anonymous;
diff --git a/sasl/src/client/mechanisms/plain.rs b/sasl/src/client/mechanisms/plain.rs
index 786978da..1c5bd1a3 100644
--- a/sasl/src/client/mechanisms/plain.rs
+++ b/sasl/src/client/mechanisms/plain.rs
@@ -1,7 +1,7 @@
 //! Provides the SASL "PLAIN" mechanism.
 
-use client::Mechanism;
-use common::{Credentials, Identity, Password, Secret};
+use crate::client::Mechanism;
+use crate::common::{Credentials, Identity, Password, Secret};
 
 /// A struct for the SASL PLAIN mechanism.
 pub struct Plain {
diff --git a/sasl/src/client/mechanisms/scram.rs b/sasl/src/client/mechanisms/scram.rs
index b19ed48c..abc5472a 100644
--- a/sasl/src/client/mechanisms/scram.rs
+++ b/sasl/src/client/mechanisms/scram.rs
@@ -2,11 +2,11 @@
 
 use base64;
 
-use client::Mechanism;
-use common::scram::{generate_nonce, ScramProvider};
-use common::{parse_frame, xor, ChannelBinding, Credentials, Identity, Password, Secret};
+use crate::client::Mechanism;
+use crate::common::scram::{generate_nonce, ScramProvider};
+use crate::common::{parse_frame, xor, ChannelBinding, Credentials, Identity, Password, Secret};
 
-use error::Error;
+use crate::error::Error;
 
 use std::marker::PhantomData;
 
@@ -189,9 +189,9 @@ impl<S: ScramProvider> Mechanism for Scram<S> {
 
 #[cfg(test)]
 mod tests {
-    use client::mechanisms::Scram;
-    use client::Mechanism;
-    use common::scram::{Sha1, Sha256};
+    use crate::client::mechanisms::Scram;
+    use crate::client::Mechanism;
+    use crate::common::scram::{Sha1, Sha256};
 
     #[test]
     fn scram_sha1_works() {
diff --git a/sasl/src/client/mod.rs b/sasl/src/client/mod.rs
index d8655d54..2acf9cff 100644
--- a/sasl/src/client/mod.rs
+++ b/sasl/src/client/mod.rs
@@ -1,4 +1,4 @@
-use common::Credentials;
+use crate::common::Credentials;
 
 /// A trait which defines SASL mechanisms.
 pub trait Mechanism {
diff --git a/sasl/src/common/scram.rs b/sasl/src/common/scram.rs
index 6833a899..2ccba1fc 100644
--- a/sasl/src/common/scram.rs
+++ b/sasl/src/common/scram.rs
@@ -6,9 +6,9 @@ use openssl::pkey::PKey;
 use openssl::rand::rand_bytes;
 use openssl::sign::Signer;
 
-use common::Password;
+use crate::common::Password;
 
-use secret;
+use crate::secret;
 
 use base64;
 
diff --git a/sasl/src/lib.rs b/sasl/src/lib.rs
index 9e137971..2a64e762 100644
--- a/sasl/src/lib.rs
+++ b/sasl/src/lib.rs
@@ -163,11 +163,6 @@
 //! sasl = "*"
 //! ```
 
-extern crate base64;
-
-#[cfg(feature = "scram")]
-extern crate openssl;
-
 mod error;
 
 pub mod client;
@@ -176,4 +171,4 @@ pub mod server;
 pub mod common;
 pub mod secret;
 
-pub use error::Error;
+pub use crate::error::Error;
diff --git a/sasl/src/secret.rs b/sasl/src/secret.rs
index 54c94c84..690bf36d 100644
--- a/sasl/src/secret.rs
+++ b/sasl/src/secret.rs
@@ -21,8 +21,8 @@ pub struct Pbkdf2Sha1 {
 impl Pbkdf2Sha1 {
     #[cfg(feature = "openssl")]
     pub fn derive(password: &str, salt: &[u8], iterations: usize) -> Result<Pbkdf2Sha1, String> {
-        use common::scram::{ScramProvider, Sha1};
-        use common::Password;
+        use crate::common::scram::{ScramProvider, Sha1};
+        use crate::common::Password;
         let digest = Sha1::derive(&Password::Plain(password.to_owned()), salt, iterations)?;
         Ok(Pbkdf2Sha1 {
             salt: salt.to_vec(),
@@ -56,8 +56,8 @@ pub struct Pbkdf2Sha256 {
 impl Pbkdf2Sha256 {
     #[cfg(feature = "openssl")]
     pub fn derive(password: &str, salt: &[u8], iterations: usize) -> Result<Pbkdf2Sha256, String> {
-        use common::scram::{ScramProvider, Sha256};
-        use common::Password;
+        use crate::common::scram::{ScramProvider, Sha256};
+        use crate::common::Password;
         let digest = Sha256::derive(&Password::Plain(password.to_owned()), salt, iterations)?;
         Ok(Pbkdf2Sha256 {
             salt: salt.to_vec(),
diff --git a/sasl/src/server/mechanisms/plain.rs b/sasl/src/server/mechanisms/plain.rs
index 1deebbe5..8df0e76f 100644
--- a/sasl/src/server/mechanisms/plain.rs
+++ b/sasl/src/server/mechanisms/plain.rs
@@ -1,6 +1,6 @@
-use common::Identity;
-use secret;
-use server::{Mechanism, Response, Validator};
+use crate::common::Identity;
+use crate::secret;
+use crate::server::{Mechanism, Response, Validator};
 
 pub struct Plain<V: Validator<secret::Plain>> {
     validator: V,
diff --git a/sasl/src/server/mechanisms/scram.rs b/sasl/src/server/mechanisms/scram.rs
index 5f6feaec..ad027686 100644
--- a/sasl/src/server/mechanisms/scram.rs
+++ b/sasl/src/server/mechanisms/scram.rs
@@ -2,11 +2,11 @@ use std::marker::PhantomData;
 
 use base64;
 
-use common::scram::{generate_nonce, ScramProvider};
-use common::{parse_frame, xor, ChannelBinding, Identity};
-use secret;
-use secret::Pbkdf2Secret;
-use server::{Mechanism, Provider, Response};
+use crate::common::scram::{generate_nonce, ScramProvider};
+use crate::common::{parse_frame, xor, ChannelBinding, Identity};
+use crate::secret;
+use crate::secret::Pbkdf2Secret;
+use crate::server::{Mechanism, Provider, Response};
 
 enum ScramState {
     Init,
diff --git a/sasl/src/server/mod.rs b/sasl/src/server/mod.rs
index 87b4b07b..020e88b2 100644
--- a/sasl/src/server/mod.rs
+++ b/sasl/src/server/mod.rs
@@ -1,5 +1,5 @@
-use common::Identity;
-use secret::Secret;
+use crate::common::Identity;
+use crate::secret::Secret;
 
 #[macro_export]
 macro_rules! impl_validator_using_provider {