diff --git a/test_suite/Cargo.toml b/test_suite/Cargo.toml
index cb53fa5f..4e793cb5 100644
--- a/test_suite/Cargo.toml
+++ b/test_suite/Cargo.toml
@@ -2,6 +2,7 @@
 name = "serde_test_suite"
 version = "0.0.0"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
+edition = "2018"
 publish = false
 
 [features]
@@ -11,7 +12,7 @@ compiletest = ["compiletest_rs"]
 [dev-dependencies]
 fnv = "1.0"
 rustc-serialize = "0.3.16"
-serde = { path = "../serde", features = ["rc"] }
+serde = { path = "../serde", features = ["rc", "derive"] }
 serde_derive = { path = "../serde_derive", features = ["deserialize_in_place"] }
 serde_test = { path = "../serde_test" }
 
diff --git a/test_suite/tests/compiletest.rs b/test_suite/tests/compiletest.rs
index 06cec962..1c191cfa 100644
--- a/test_suite/tests/compiletest.rs
+++ b/test_suite/tests/compiletest.rs
@@ -1,6 +1,6 @@
 #![cfg(feature = "compiletest")]
 
-extern crate compiletest_rs as compiletest;
+use compiletest_rs as compiletest;
 
 #[test]
 fn ui() {
diff --git a/test_suite/tests/test_annotations.rs b/test_suite/tests/test_annotations.rs
index 993f2c0b..a558c93e 100644
--- a/test_suite/tests/test_annotations.rs
+++ b/test_suite/tests/test_annotations.rs
@@ -1,19 +1,14 @@
 #![cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
 #![cfg_attr(feature = "cargo-clippy", allow(cast_lossless))]
 
-#[macro_use]
-extern crate serde_derive;
-
-extern crate serde;
-use self::serde::de::{self, MapAccess, Unexpected, Visitor};
-use self::serde::{Deserialize, Deserializer, Serialize, Serializer};
+use serde::de::{self, MapAccess, Unexpected, Visitor};
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
 
 use std::collections::{BTreeMap, HashMap};
 use std::fmt;
 use std::marker::PhantomData;
 
-extern crate serde_test;
-use self::serde_test::{
+use serde_test::{
     assert_de_tokens, assert_de_tokens_error, assert_ser_tokens, assert_ser_tokens_error,
     assert_tokens, Token,
 };
diff --git a/test_suite/tests/test_borrow.rs b/test_suite/tests/test_borrow.rs
index a540edef..e76ede69 100644
--- a/test_suite/tests/test_borrow.rs
+++ b/test_suite/tests/test_borrow.rs
@@ -1,10 +1,4 @@
-#[macro_use]
-extern crate serde_derive;
-
-extern crate serde;
 use serde::{Deserialize, Deserializer};
-
-extern crate serde_test;
 use serde_test::{assert_de_tokens, assert_de_tokens_error, Token};
 
 use std::borrow::Cow;
diff --git a/test_suite/tests/test_de.rs b/test_suite/tests/test_de.rs
index eb995a12..7129f789 100644
--- a/test_suite/tests/test_de.rs
+++ b/test_suite/tests/test_de.rs
@@ -2,9 +2,6 @@
 #![cfg_attr(feature = "cargo-clippy", allow(decimal_literal_representation))]
 #![cfg_attr(feature = "unstable", feature(never_type))]
 
-#[macro_use]
-extern crate serde_derive;
-
 use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
 use std::default::Default;
 use std::ffi::{CStr, CString, OsString};
@@ -15,14 +12,9 @@ use std::rc::{Rc, Weak as RcWeak};
 use std::sync::{Arc, Weak as ArcWeak};
 use std::time::{Duration, UNIX_EPOCH};
 
-extern crate serde;
+use fnv::FnvHasher;
 use serde::{Deserialize, Deserializer};
-
-extern crate fnv;
-use self::fnv::FnvHasher;
-
-extern crate serde_test;
-use self::serde_test::{assert_de_tokens, assert_de_tokens_error, Configure, Token};
+use serde_test::{assert_de_tokens, assert_de_tokens_error, Configure, Token};
 
 #[macro_use]
 mod macros;
diff --git a/test_suite/tests/test_gen.rs b/test_suite/tests/test_gen.rs
index 667df039..2fce8eed 100644
--- a/test_suite/tests/test_gen.rs
+++ b/test_suite/tests/test_gen.rs
@@ -5,12 +5,8 @@
 #![deny(warnings)]
 #![cfg_attr(feature = "unstable", feature(non_ascii_idents))]
 
-#[macro_use]
-extern crate serde_derive;
-
-extern crate serde;
-use self::serde::de::{DeserializeOwned, Deserializer};
-use self::serde::ser::{Serialize, Serializer};
+use serde::de::DeserializeOwned;
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
 
 use std::borrow::Cow;
 use std::marker::PhantomData;
@@ -384,6 +380,8 @@ fn test_gen() {
     }
 
     mod vis {
+        use serde::{Deserialize, Serialize};
+
         pub struct S;
 
         #[derive(Serialize, Deserialize)]
@@ -607,6 +605,8 @@ fn test_gen() {
 
     mod restricted {
         mod inner {
+            use serde::{Deserialize, Serialize};
+
             #[derive(Serialize, Deserialize)]
             struct Restricted {
                 pub(super) a: usize,
diff --git a/test_suite/tests/test_identifier.rs b/test_suite/tests/test_identifier.rs
index d81c5603..eba7d4da 100644
--- a/test_suite/tests/test_identifier.rs
+++ b/test_suite/tests/test_identifier.rs
@@ -1,7 +1,4 @@
-#[macro_use]
-extern crate serde_derive;
-
-extern crate serde_test;
+use serde::Deserialize;
 use serde_test::{assert_de_tokens, Token};
 
 #[test]
diff --git a/test_suite/tests/test_macros.rs b/test_suite/tests/test_macros.rs
index e034af68..250a0f37 100644
--- a/test_suite/tests/test_macros.rs
+++ b/test_suite/tests/test_macros.rs
@@ -2,15 +2,10 @@
 #![cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
 #![cfg_attr(feature = "cargo-clippy", allow(redundant_field_names))]
 
-#[macro_use]
-extern crate serde_derive;
-
-extern crate serde;
-extern crate serde_test;
-
 mod bytes;
 
-use self::serde_test::{
+use serde::{Deserialize, Serialize};
+use serde_test::{
     assert_de_tokens, assert_de_tokens_error, assert_ser_tokens, assert_tokens, Token,
 };
 
diff --git a/test_suite/tests/test_remote.rs b/test_suite/tests/test_remote.rs
index db66c3c5..f481436a 100644
--- a/test_suite/tests/test_remote.rs
+++ b/test_suite/tests/test_remote.rs
@@ -1,8 +1,7 @@
 #![cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
 #![cfg_attr(feature = "cargo-clippy", allow(redundant_field_names))]
 
-#[macro_use]
-extern crate serde_derive;
+use serde::{Deserialize, Serialize};
 
 mod remote {
     pub struct Unit;
diff --git a/test_suite/tests/test_roundtrip.rs b/test_suite/tests/test_roundtrip.rs
index 77842df5..dcdc9996 100644
--- a/test_suite/tests/test_roundtrip.rs
+++ b/test_suite/tests/test_roundtrip.rs
@@ -1,5 +1,4 @@
-extern crate serde_test;
-use self::serde_test::{assert_tokens, Configure, Token};
+use serde_test::{assert_tokens, Configure, Token};
 
 use std::net;
 
diff --git a/test_suite/tests/test_ser.rs b/test_suite/tests/test_ser.rs
index 790e929e..b7bde4e1 100644
--- a/test_suite/tests/test_ser.rs
+++ b/test_suite/tests/test_ser.rs
@@ -1,8 +1,5 @@
 #![cfg_attr(feature = "unstable", feature(never_type))]
 
-#[macro_use]
-extern crate serde_derive;
-
 use std::cell::RefCell;
 use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
 use std::ffi::CString;
@@ -17,11 +14,9 @@ use std::time::{Duration, UNIX_EPOCH};
 #[cfg(unix)]
 use std::str;
 
-extern crate serde_test;
-use self::serde_test::{assert_ser_tokens, assert_ser_tokens_error, Configure, Token};
-
-extern crate fnv;
-use self::fnv::FnvHasher;
+use fnv::FnvHasher;
+use serde::Serialize;
+use serde_test::{assert_ser_tokens, assert_ser_tokens_error, Configure, Token};
 
 #[macro_use]
 mod macros;
diff --git a/test_suite/tests/test_unstable.rs b/test_suite/tests/test_unstable.rs
index 6339d32e..f650512d 100644
--- a/test_suite/tests/test_unstable.rs
+++ b/test_suite/tests/test_unstable.rs
@@ -1,14 +1,5 @@
 #![deny(warnings)]
 
-#[cfg(feature = "unstable")]
-#[macro_use]
-extern crate serde_derive;
-
-#[cfg(feature = "unstable")]
-extern crate serde;
-#[cfg(feature = "unstable")]
-extern crate serde_test;
-
 // This test target is convoluted with the actual #[test] in a separate file to
 // get it so that the stable compiler does not need to parse the code of the
 // test. If the test were written with #[cfg(feature = "unstable")] #[test]
diff --git a/test_suite/tests/test_value.rs b/test_suite/tests/test_value.rs
index 7f8fb0ac..8d8413cb 100644
--- a/test_suite/tests/test_value.rs
+++ b/test_suite/tests/test_value.rs
@@ -1,7 +1,3 @@
-#[macro_use]
-extern crate serde_derive;
-
-extern crate serde;
 use serde::de::{value, IntoDeserializer};
 use serde::Deserialize;
 
diff --git a/test_suite/tests/unstable/mod.rs b/test_suite/tests/unstable/mod.rs
index b66d2234..b0c221e6 100644
--- a/test_suite/tests/unstable/mod.rs
+++ b/test_suite/tests/unstable/mod.rs
@@ -1,3 +1,4 @@
+use serde::{Deserialize, Serialize};
 use serde_test::{assert_tokens, Token};
 
 #[test]