diff --git a/core/http/src/ext.rs b/core/http/src/ext.rs
index a514cd74..1e263d4e 100644
--- a/core/http/src/ext.rs
+++ b/core/http/src/ext.rs
@@ -1,8 +1,5 @@
 //! Extension traits implemented by several HTTP types.
 
-// Temporarily allow `IntoIter::into_iter()` before Rust 2021 transition.
-#![allow(deprecated)]
-
 use smallvec::{Array, SmallVec};
 use state::Storage;
 
@@ -66,14 +63,14 @@ impl<T: Clone> IntoCollection<T> for &[T] {
 impl<T, const N: usize> IntoCollection<T> for [T; N] {
     #[inline(always)]
     fn into_collection<A: Array<Item=T>>(self) -> SmallVec<A> {
-        std::array::IntoIter::new(self).collect()
+        self.into_iter().collect()
     }
 
     #[inline]
     fn mapped<U, F, A: Array<Item=U>>(self, f: F) -> SmallVec<A>
         where F: FnMut(T) -> U
     {
-        std::array::IntoIter::new(self).map(f).collect()
+        self.into_iter().map(f).collect()
     }
 }
 
diff --git a/core/http/src/uri/uri.rs b/core/http/src/uri/uri.rs
index b0e033bb..0a8fef86 100644
--- a/core/http/src/uri/uri.rs
+++ b/core/http/src/uri/uri.rs
@@ -1,5 +1,4 @@
 use std::fmt::{self, Display};
-use std::convert::TryFrom;
 use std::borrow::Cow;
 
 use crate::ext::IntoOwned;
diff --git a/core/lib/src/form/validate.rs b/core/lib/src/form/validate.rs
index 6966c2bc..c89af4e6 100644
--- a/core/lib/src/form/validate.rs
+++ b/core/lib/src/form/validate.rs
@@ -79,7 +79,6 @@
 //! ```
 
 use std::borrow::Cow;
-use std::convert::TryInto;
 use std::ops::{RangeBounds, Bound};
 use std::fmt::Debug;
 
diff --git a/core/lib/src/local/asynchronous/client.rs b/core/lib/src/local/asynchronous/client.rs
index a48350ae..a084dd9a 100644
--- a/core/lib/src/local/asynchronous/client.rs
+++ b/core/lib/src/local/asynchronous/client.rs
@@ -1,5 +1,4 @@
 use std::fmt;
-use std::convert::TryInto;
 
 use parking_lot::RwLock;
 
diff --git a/core/lib/src/local/asynchronous/request.rs b/core/lib/src/local/asynchronous/request.rs
index 0a71c997..99447253 100644
--- a/core/lib/src/local/asynchronous/request.rs
+++ b/core/lib/src/local/asynchronous/request.rs
@@ -1,5 +1,4 @@
 use std::fmt;
-use std::convert::TryInto;
 
 use crate::{Request, Data};
 use crate::http::{Status, Method};
diff --git a/core/lib/src/local/blocking/client.rs b/core/lib/src/local/blocking/client.rs
index aca6ac7d..ea7bef9b 100644
--- a/core/lib/src/local/blocking/client.rs
+++ b/core/lib/src/local/blocking/client.rs
@@ -1,6 +1,5 @@
 use std::fmt;
 use std::cell::RefCell;
-use std::convert::TryInto;
 
 use crate::{Rocket, Phase, Orbit, Error};
 use crate::local::{asynchronous, blocking::{LocalRequest, LocalResponse}};
diff --git a/core/lib/src/local/blocking/request.rs b/core/lib/src/local/blocking/request.rs
index 004103db..db2f4944 100644
--- a/core/lib/src/local/blocking/request.rs
+++ b/core/lib/src/local/blocking/request.rs
@@ -1,5 +1,4 @@
 use std::fmt;
-use std::convert::TryInto;
 
 use crate::{Request, http::Method, local::asynchronous};
 use crate::http::uri::Origin;
diff --git a/core/lib/src/response/redirect.rs b/core/lib/src/response/redirect.rs
index efd31d76..f685fe1b 100644
--- a/core/lib/src/response/redirect.rs
+++ b/core/lib/src/response/redirect.rs
@@ -1,5 +1,3 @@
-use std::convert::TryInto;
-
 use crate::request::Request;
 use crate::response::{self, Response, Responder};
 use crate::http::uri::Reference;
diff --git a/core/lib/src/response/stream/sse.rs b/core/lib/src/response/stream/sse.rs
index d13f0937..cce8a273 100644
--- a/core/lib/src/response/stream/sse.rs
+++ b/core/lib/src/response/stream/sse.rs
@@ -1,7 +1,3 @@
-// Temporarily allow `IntoIter::into_iter()` before Rust 2021 transition.
-#![allow(deprecated)]
-
-use std::array;
 use std::borrow::Cow;
 
 use tokio::io::AsyncRead;
@@ -340,7 +336,7 @@ impl Event {
             Some(RawLinedEvent::raw("")),
         ];
 
-        stream::iter(array::IntoIter::new(events)).filter_map(ready)
+        stream::iter(events).filter_map(ready)
     }
 }
 
diff --git a/core/lib/src/rocket.rs b/core/lib/src/rocket.rs
index f0acef05..2af40a76 100644
--- a/core/lib/src/rocket.rs
+++ b/core/lib/src/rocket.rs
@@ -1,6 +1,5 @@
 use std::fmt;
 use std::ops::{Deref, DerefMut};
-use std::convert::TryInto;
 use std::net::SocketAddr;
 
 use yansi::Paint;