diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 26ca174c..6e4e4bc4 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -81,7 +81,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: nightly
+          toolchain: stable
           override: true
           components: clippy
       - run: cargo test --package askama_rocket --all-targets
diff --git a/askama_derive/src/generator.rs b/askama_derive/src/generator.rs
index fdc9cae5..142ff7fb 100644
--- a/askama_derive/src/generator.rs
+++ b/askama_derive/src/generator.rs
@@ -506,7 +506,7 @@ impl<'a> Generator<'a> {
         let param = syn::GenericParam::Lifetime(syn::LifetimeDef::new(lifetime));
         self.write_header(
             buf,
-            "::askama_rocket::Responder<'askama>",
+            "::askama_rocket::Responder<'askama, 'askama>",
             Some(vec![param]),
         )?;
 
diff --git a/askama_rocket/Cargo.toml b/askama_rocket/Cargo.toml
index bdace044..53a0953f 100644
--- a/askama_rocket/Cargo.toml
+++ b/askama_rocket/Cargo.toml
@@ -14,7 +14,10 @@ edition = "2018"
 
 [dependencies]
 askama = { version = "0.11.2", path = "../askama", default-features = false, features = ["with-rocket", "mime", "mime_guess"] }
-rocket = { version = "0.4", default-features = false }
+rocket = { version = "0.5.0-rc.2", default-features = false }
+
+[dev-dependencies]
+futures-lite = "1.12.0"
 
 [features]
 default = ["askama/default"]
diff --git a/askama_rocket/src/lib.rs b/askama_rocket/src/lib.rs
index f10ba871..fb231a42 100644
--- a/askama_rocket/src/lib.rs
+++ b/askama_rocket/src/lib.rs
@@ -14,6 +14,6 @@ pub fn respond<T: Template>(t: &T, _ext: &str) -> Result<'static> {
     let rsp = t.render().map_err(|_| Status::InternalServerError)?;
     Response::build()
         .header(Header::new("content-type", T::MIME_TYPE))
-        .sized_body(Cursor::new(rsp))
+        .sized_body(rsp.len(), Cursor::new(rsp))
         .ok()
 }
diff --git a/askama_rocket/tests/basic.rs b/askama_rocket/tests/basic.rs
index 0671c4c8..a61c1882 100644
--- a/askama_rocket/tests/basic.rs
+++ b/askama_rocket/tests/basic.rs
@@ -1,12 +1,8 @@
-#![feature(proc_macro_hygiene, decl_macro)]
-
-#[macro_use]
-extern crate rocket;
-
 use askama::Template;
 
+use futures_lite::future::block_on;
 use rocket::http::{ContentType, Status};
-use rocket::local::Client;
+use rocket::local::asynchronous::Client;
 
 #[derive(Template)]
 #[template(path = "hello.html")]
@@ -14,17 +10,23 @@ struct HelloTemplate<'a> {
     name: &'a str,
 }
 
-#[get("/")]
+#[rocket::get("/")]
 fn hello() -> HelloTemplate<'static> {
     HelloTemplate { name: "world" }
 }
 
 #[test]
 fn test_rocket() {
-    let rocket = rocket::ignite().mount("/", routes![hello]);
-    let client = Client::new(rocket).unwrap();
-    let mut rsp = client.get("/").dispatch();
-    assert_eq!(rsp.status(), Status::Ok);
-    assert_eq!(rsp.content_type(), Some(ContentType::HTML));
-    assert_eq!(rsp.body_string().unwrap(), "Hello, world!");
+    block_on(async {
+        let rocket = rocket::build()
+            .mount("/", rocket::routes![hello])
+            .ignite()
+            .await
+            .unwrap();
+        let client = Client::untracked(rocket).await.unwrap();
+        let rsp = client.get("/").dispatch().await;
+        assert_eq!(rsp.status(), Status::Ok);
+        assert_eq!(rsp.content_type(), Some(ContentType::HTML));
+        assert_eq!(rsp.into_string().await.as_deref(), Some("Hello, world!"));
+    });
 }