diff --git a/contrib/lib/Cargo.toml b/contrib/lib/Cargo.toml
index 5ee47a0c..f9b2618e 100644
--- a/contrib/lib/Cargo.toml
+++ b/contrib/lib/Cargo.toml
@@ -86,8 +86,5 @@ time = { version = "0.2.9", optional = true }
 brotli = { version = "3.3", optional = true }
 flate2 = { version = "1.0", optional = true }
 
-[dev-dependencies]
-tokio = { version = "0.2.0", features = ["time"] }
-
 [package.metadata.docs.rs]
 all-features = true
diff --git a/core/codegen/Cargo.toml b/core/codegen/Cargo.toml
index 2079af82..e3d70c20 100644
--- a/core/codegen/Cargo.toml
+++ b/core/codegen/Cargo.toml
@@ -28,5 +28,4 @@ version_check = "0.9.1"
 
 [dev-dependencies]
 rocket = { version = "0.5.0-dev", path = "../lib" }
-tokio = { version = "0.2.9", features = ["io-util"] }
 compiletest_rs = "0.5"
diff --git a/core/codegen/tests/route-data.rs b/core/codegen/tests/route-data.rs
index 1a5756d1..29c2fafd 100644
--- a/core/codegen/tests/route-data.rs
+++ b/core/codegen/tests/route-data.rs
@@ -5,6 +5,7 @@ use rocket::local::blocking::Client;
 use rocket::request::Form;
 use rocket::data::{self, FromDataSimple};
 use rocket::http::{RawStr, ContentType, Status};
+use rocket::tokio::io::AsyncReadExt;
 
 // Test that the data parameters works as expected.
 
@@ -20,8 +21,6 @@ impl FromDataSimple for Simple {
 
     fn from_data(_: &Request<'_>, data: Data) -> data::FromDataFuture<'static, Self, ()> {
         Box::pin(async {
-            use tokio::io::AsyncReadExt;
-
             let mut string = String::new();
             let mut stream = data.open().take(64);
             if let Err(_) = stream.read_to_string(&mut string).await {
diff --git a/core/codegen/tests/route.rs b/core/codegen/tests/route.rs
index 8ae81dad..67ad6603 100644
--- a/core/codegen/tests/route.rs
+++ b/core/codegen/tests/route.rs
@@ -13,6 +13,7 @@ use rocket::local::blocking::Client;
 use rocket::data::{self, Data, FromDataSimple};
 use rocket::request::Form;
 use rocket::http::{Status, RawStr, ContentType};
+use rocket::tokio::io::AsyncReadExt;
 
 // Use all of the code generation avaiable at once.
 
@@ -28,8 +29,6 @@ impl FromDataSimple for Simple {
 
     fn from_data(_: &Request<'_>, data: Data) -> data::FromDataFuture<'static, Self, ()> {
         Box::pin(async move {
-            use tokio::io::AsyncReadExt;
-
             let mut string = String::new();
             let mut stream = data.open().take(64);
             stream.read_to_string(&mut string).await.unwrap();
diff --git a/core/lib/Cargo.toml b/core/lib/Cargo.toml
index 56bdb50c..5f24b429 100644
--- a/core/lib/Cargo.toml
+++ b/core/lib/Cargo.toml
@@ -52,4 +52,3 @@ version_check = "0.9.1"
 [dev-dependencies]
 # TODO: Find a way to not depend on this.
 lazy_static = "1.0"
-tokio = { version = "0.2.9", features = ["macros"] }