diff --git a/Cargo.toml b/Cargo.toml
index 98361860..07359338 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,7 @@ name = "ruma-api-macros"
 readme = "README.md"
 repository = "https://github.com/ruma/ruma-api-macros"
 version = "0.3.0"
+edition = "2018"
 
 [dependencies]
 quote = "0.6.10"
diff --git a/src/api/mod.rs b/src/api/mod.rs
index 2d597432..3e19888f 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -1,5 +1,5 @@
 use proc_macro2::{Span, TokenStream};
-use quote::{ToTokens, TokenStreamExt};
+use quote::{quote, ToTokens, TokenStreamExt};
 use syn::{
     braced,
     parse::{Parse, ParseStream, Result},
@@ -478,7 +478,7 @@ pub struct RawApi {
 }
 
 impl Parse for RawApi {
-    fn parse(input: ParseStream) -> Result<Self> {
+    fn parse(input: ParseStream<'_>) -> Result<Self> {
         input.parse::<kw::metadata>()?;
         let metadata;
         braced!(metadata in input);
diff --git a/src/api/request.rs b/src/api/request.rs
index 11b5baae..00238776 100644
--- a/src/api/request.rs
+++ b/src/api/request.rs
@@ -1,8 +1,8 @@
 use proc_macro2::{Span, TokenStream};
-use quote::{ToTokens, TokenStreamExt};
+use quote::{quote, quote_spanned, ToTokens, TokenStreamExt};
 use syn::{spanned::Spanned, Field, Ident, Lit, Meta, NestedMeta};
 
-use api::strip_serde_attrs;
+use crate::api::strip_serde_attrs;
 
 pub struct Request {
     fields: Vec<RequestField>,
@@ -254,7 +254,7 @@ impl ToTokens for Request {
         };
 
         let request_body_struct = if let Some(newtype_body_field) = self.newtype_body_field() {
-            let mut field = newtype_body_field.clone();
+            let field = newtype_body_field.clone();
             let ty = &field.ty;
             let span = field.span();
 
diff --git a/src/api/response.rs b/src/api/response.rs
index 80755b24..a0eb0688 100644
--- a/src/api/response.rs
+++ b/src/api/response.rs
@@ -1,8 +1,8 @@
 use proc_macro2::{Span, TokenStream};
-use quote::{ToTokens, TokenStreamExt};
+use quote::{quote, quote_spanned, ToTokens, TokenStreamExt};
 use syn::{spanned::Spanned, Field, Ident, Lit, Meta, NestedMeta};
 
-use api::strip_serde_attrs;
+use crate::api::strip_serde_attrs;
 
 pub struct Response {
     fields: Vec<ResponseField>,
@@ -249,7 +249,7 @@ impl ToTokens for Response {
         };
 
         let response_body_struct = if let Some(newtype_body_field) = self.newtype_body_field() {
-            let mut field = newtype_body_field.clone();
+            let field = newtype_body_field.clone();
             let ty = &field.ty;
             let span = field.span();
 
diff --git a/src/lib.rs b/src/lib.rs
index e5d5894e..54149958 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,17 +7,11 @@
 #![recursion_limit = "256"]
 
 extern crate proc_macro;
-extern crate proc_macro2;
-#[macro_use]
-extern crate quote;
-extern crate ruma_api;
-extern crate syn;
 
 use proc_macro::TokenStream;
-
 use quote::ToTokens;
 
-use api::{Api, RawApi};
+use crate::api::{Api, RawApi};
 
 mod api;
 
@@ -122,22 +116,12 @@ mod api;
 /// # Examples
 ///
 /// ```rust,no_run
-/// #![feature(proc_macro, try_from)]
-///
-/// extern crate futures;
-/// extern crate http;
-/// extern crate hyper;
-/// extern crate ruma_api;
-/// extern crate ruma_api_macros;
-/// extern crate serde;
-/// #[macro_use] extern crate serde_derive;
-/// extern crate serde_json;
-/// extern crate serde_urlencoded;
-/// extern crate url;
+/// #![feature(try_from)]
 ///
 /// # fn main() {
 /// pub mod some_endpoint {
 ///     use ruma_api_macros::ruma_api;
+///     use serde_derive::{Deserialize, Serialize};
 ///
 ///     ruma_api! {
 ///         metadata {
@@ -173,6 +157,7 @@ mod api;
 ///
 /// pub mod newtype_body_endpoint {
 ///     use ruma_api_macros::ruma_api;
+///     use serde_derive::{Deserialize, Serialize};
 ///
 ///     #[derive(Clone, Debug, Deserialize, Serialize)]
 ///     pub struct MyCustomType {
diff --git a/tests/ruma_api_macros.rs b/tests/ruma_api_macros.rs
index f292e43b..7f007935 100644
--- a/tests/ruma_api_macros.rs
+++ b/tests/ruma_api_macros.rs
@@ -1,19 +1,8 @@
 #![feature(try_from)]
 
-extern crate futures;
-extern crate http;
-extern crate hyper;
-extern crate ruma_api;
-extern crate ruma_api_macros;
-extern crate serde;
-#[macro_use]
-extern crate serde_derive;
-extern crate serde_json;
-extern crate serde_urlencoded;
-extern crate url;
-
 pub mod some_endpoint {
     use ruma_api_macros::ruma_api;
+    use serde_derive::{Deserialize, Serialize};
 
     ruma_api! {
         metadata {