diff --git a/boringtun/Cargo.toml b/boringtun/Cargo.toml
index a81e8701..23841b94 100644
--- a/boringtun/Cargo.toml
+++ b/boringtun/Cargo.toml
@@ -10,7 +10,7 @@ authors = [
 license = "BSD-3-Clause"
 repository = "https://github.com/cloudflare/boringtun"
 documentation = "https://docs.rs/boringtun/0.5.2/boringtun/"
-edition = "2018"
+edition = "2021"
 
 [features]
 default = []
diff --git a/boringtun/src/device/dev_lock.rs b/boringtun/src/device/dev_lock.rs
index 1a700fab..de94683a 100644
--- a/boringtun/src/device/dev_lock.rs
+++ b/boringtun/src/device/dev_lock.rs
@@ -45,7 +45,7 @@ pub struct LockReadGuard<'a, T: 'a + ?Sized> {
     inner: RwLockReadGuard<'a, T>,
 }
 
-impl<'a, T: ?Sized> LockReadGuard<'a, T> {
+impl<T: ?Sized> LockReadGuard<'_, T> {
     /// Perform a closure on a mutable reference of the inner locked value.
     ///
     /// # Parameters
@@ -99,7 +99,7 @@ impl<'a, T: ?Sized> LockReadGuard<'a, T> {
     }
 }
 
-impl<'a, T: ?Sized> Deref for LockReadGuard<'a, T> {
+impl<T: ?Sized> Deref for LockReadGuard<'_, T> {
     type Target = T;
 
     fn deref(&self) -> &T {
diff --git a/boringtun/src/device/epoll.rs b/boringtun/src/device/epoll.rs
index 4cd810ed..c1687f9a 100644
--- a/boringtun/src/device/epoll.rs
+++ b/boringtun/src/device/epoll.rs
@@ -346,14 +346,14 @@ impl<H> EventPoll<H> {
     }
 }
 
-impl<'a, H> Deref for EventGuard<'a, H> {
+impl<H> Deref for EventGuard<'_, H> {
     type Target = H;
     fn deref(&self) -> &H {
         &self.event.handler
     }
 }
 
-impl<'a, H> Drop for EventGuard<'a, H> {
+impl<H> Drop for EventGuard<'_, H> {
     fn drop(&mut self) {
         if self.event.needs_read {
             // Must read from the event to reset it before we enable it
@@ -373,7 +373,7 @@ impl<'a, H> Drop for EventGuard<'a, H> {
     }
 }
 
-impl<'a, H> EventGuard<'a, H> {
+impl<H> EventGuard<'_, H> {
     /// Get a mutable reference to the stored value
     #[allow(dead_code)]
     pub fn get_mut(&mut self) -> &mut H {
diff --git a/boringtun/src/device/kqueue.rs b/boringtun/src/device/kqueue.rs
index 7b5f9d17..e9786486 100644
--- a/boringtun/src/device/kqueue.rs
+++ b/boringtun/src/device/kqueue.rs
@@ -309,14 +309,14 @@ impl<H> EventPoll<H> {
     }
 }
 
-impl<'a, H> Deref for EventGuard<'a, H> {
+impl<H> Deref for EventGuard<'_, H> {
     type Target = H;
     fn deref(&self) -> &H {
         &self.event.handler
     }
 }
 
-impl<'a, H> Drop for EventGuard<'a, H> {
+impl<H> Drop for EventGuard<'_, H> {
     fn drop(&mut self) {
         unsafe {
             // Re-enable the event once EventGuard goes out of scope
@@ -325,7 +325,7 @@ impl<'a, H> Drop for EventGuard<'a, H> {
     }
 }
 
-impl<'a, H> EventGuard<'a, H> {
+impl<H> EventGuard<'_, H> {
     /// Cancel and remove the event represented by this guard
     pub fn cancel(self) {
         unsafe { self.poll.clear_event_by_fd(self.event.event.ident as RawFd) };
diff --git a/boringtun/src/device/tun_linux.rs b/boringtun/src/device/tun_linux.rs
index dee2999e..d4a0f564 100644
--- a/boringtun/src/device/tun_linux.rs
+++ b/boringtun/src/device/tun_linux.rs
@@ -31,6 +31,7 @@ union IfrIfru {
 }
 
 #[repr(C)]
+#[allow(non_camel_case_types)]
 pub struct ifreq {
     ifr_name: [c_uchar; IFNAMSIZ],
     ifr_ifru: IfrIfru,
@@ -72,7 +73,7 @@ impl TunSocket {
             });
         }
 
-        let fd = match unsafe { open(b"/dev/net/tun\0".as_ptr() as _, O_RDWR) } {
+        let fd = match unsafe { open(c"/dev/net/tun".as_ptr() as _, O_RDWR) } {
             -1 => return Err(Error::Socket(io::Error::last_os_error())),
             fd => fd,
         };