diff --git a/Cargo.toml b/Cargo.toml
index ddb34e8..21db4cd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ license = "Apache-2.0 WITH LLVM-exception OR Apache-2.0 OR MIT"
 keywords = ["api", "network", "file"]
 categories = ["filesystem", "network-programming", "os"]
 repository = "https://github.com/bytecodealliance/system-interface"
-edition = "2018"
+edition = "2021"
 exclude = ["/.github"]
 
 [dependencies]
diff --git a/src/fs/file_io_ext.rs b/src/fs/file_io_ext.rs
index bfdff14..6094f2b 100644
--- a/src/fs/file_io_ext.rs
+++ b/src/fs/file_io_ext.rs
@@ -22,7 +22,6 @@ use rustix::fs::fcntl_rdadvise;
 use rustix::fs::{fallocate, FallocateFlags};
 #[cfg(not(any(windows, target_os = "ios", target_os = "macos", target_os = "redox")))]
 use rustix::io::{preadv, pwritev};
-use std::convert::TryInto;
 use std::io::{self, IoSlice, IoSliceMut, Seek, SeekFrom};
 use std::slice;
 #[cfg(windows)]