1.54.0 (October 19th, 2026)

The 1.54.0 release includes all changes up to 1.53.3.

The MSRV is increased to 1.85. (#8514)

Added

• fs: add File::set_times, File::set_modified, and fs::FileTimes (#8504)
• net: implement Default for named_pipe::{ClientOptions, ServerOptions} (#8378)
• runtime: add Builder::max_io_events_per_busy_tick (#8410)
• runtime: stabilize tokio::runtime::worker_index() (#8431)
• sync: add SemaphorePermit::semaphore() (#8482)
• sync: add blocking_acquire methods to Semaphore (#8269)
• sync: add watch::Receiver::is_closed (#8481)
• wasm: support JSPI for Emscripten target (#8285, #8627)
• wasm: support the wasm32-unknown-emscripten target (#8281, #8422, #8528, #8628)

Changed

• fs: reject zero in File::set_max_buf_size (#8449)
• io: make copy_buf cooperative (#8459)
• io: panic when BufReader or BufStream is created with zero capacity (#8494)
• io: panic when in-memory pipe is created with zero capacity (#8397)
• io: reject zero buffer size in copy_bidirectional_with_sizes (#8454)
• io: support vectored writes in Sink (#8663)
• net: start UnixStream::pair and UnixDatagram::pair sockets as writable (#8444)
• net: start accepted sockets as readable and writable (#8435)
• net: support UCred on Fuchsia (#8257)
• process: use mio::unix::pipe for Unix child stdio (#8603)
• runtime: cache-pad the shared injection queue and idle state (#8622)
• runtime: decide auto-boxing of spawned futures at monomorphization time (#8414)
• runtime: make enable_io available whenever rt is enabled (#8387)
• runtime: move block_in_place setup into a non-generic function (#8315)
• runtime: move the multi-thread inject queue to its own mutex (#8382)
• runtime: panic when max_io_events_per_tick is zero (#8476)
• runtime: suggest .await in nested block_on panic message (#8501)
• sync: avoid atomic reader count in broadcast slots (#8357)
• sync: use acquire/release orderings in Notify (#8325)
• time: remove the runtime handle from timers (#8458)

Fixed

• fs: restore File internal state when op fails (#8291)
• io: complete zero-length memory stream operations immediately (#8323)
• io: flush the writer when the reader stalls in copy_buf (#8424)
• io: keep the shutdown bit when clearing readiness (#8435)
• io: preserve the full ScheduledIo tick in readiness events (#8331)
• io: read lines as bytes so a partial line survives an I/O error (#8400)
• io: retry on ErrorKind::Interrupted in more I/O operations (#8417, #8432, #8448, #8453, #8455, #8460)
• io: use spawn_mandatory_blocking for stdout and stderr (#8506)
• io: wait for pending operations before BufReader seeks (#8599)
• net: close CreateFileW handle on SetNamedPipeHandleState failure (#8418)
• net: fix peer credentials on NetBSD (#8589)
• net: saturate TcpSocket and UnixSocket listen backlog (#8511)
• net: treat ENOTCONN as success in UnixStream::shutdown (#8526)
• runtime: allow building with --all-features without tokio_unstable (#8401)
• runtime: avoid overflow in shutdown_timeout() (#8497)
• runtime: fix spawn_blocking hang when only scheduler workers exist (#8408)
• runtime: fix misleading signal driver panic message (#8419)
• sync: preserve FIFO lock order when coop budget is exhausted (#8371)
• sync: use usize for permit count in SemaphorePermit (#8405)
• time: avoid interval deadline overflow (#8385)
• time: handle wrapped top-level timer-wheel slots (#8334)

Unstable

• fs: fall back when io_uring has no IO driver (#8165)
• metrics: cap log histogram precision (#8496)
• runtime: add an opt-in sharded spawn_blocking queue (#8337)
• runtime: expose schedule latency in task hooks (#8282)
• taskdump: fix idle bookkeeping when a task dump wakes parked workers (#8372)
• taskdump: skip non-idle tasks during taskdumps (#8568)

Documented

• docs: fix stray braces and broken links in rustdoc (#8605)
• fs: document cancellation behavior of tokio::fs (#8265)
• net: add Safety docs for named pipe from_raw_handle (#8378)
• net: document that TcpStream::connect returns only the last error (#8421)
• runtime: add error documentation for runtime::Builder (#8297)
• runtime: link available_parallelism in worker count docs (#8625)
• sync: clarify panic behavior of broadcast::channel() (#8420)
• sync: fix typo in Semaphore documentation (#8521)