Index: command-group/Cargo.toml
===================================================================
--- command-group.orig/Cargo.toml
+++ command-group/Cargo.toml
@@ -87,7 +87,7 @@ with-tokio = [
 ]
 
 [target."cfg(unix)".dependencies.nix]
-version = "0.27.1"
+version = ">= 0.29, < 1.0"
 features = [
     "fs",
     "poll",
Index: command-group/src/stdlib/child/unix.rs
===================================================================
--- command-group.orig/src/stdlib/child/unix.rs
+++ command-group/src/stdlib/child/unix.rs
@@ -21,6 +21,7 @@ use nix::{
 	},
 	unistd::Pid,
 };
+use nix::poll::PollTimeout;
 
 pub(super) struct ChildImp {
 	pgid: Pid,
@@ -147,12 +148,12 @@ impl ChildImp {
 		let err_bfd = unsafe { BorrowedFd::borrow_raw(err_fd) };
 
 		let mut fds = [
-			PollFd::new(&out_bfd, PollFlags::POLLIN),
-			PollFd::new(&err_bfd, PollFlags::POLLIN),
+			PollFd::new(out_bfd, PollFlags::POLLIN),
+			PollFd::new(err_bfd, PollFlags::POLLIN),
 		];
 
 		loop {
-			poll(&mut fds, -1)?;
+			poll(&mut fds, PollTimeout::NONE)?;
 
 			if fds[0].revents().is_some() && read(&mut out_r, out_v)? {
 				set_nonblocking(err_fd, false)?;