diff --git a/public_autocargo/experimental/Cargo.toml b/public_autocargo/experimental/Cargo.toml
index 376f823..265ede5 100644
--- a/public_autocargo/experimental/Cargo.toml
+++ b/public_autocargo/experimental/Cargo.toml
@@ -17,5 +17,5 @@ edition = "2018"
 clap = { version = "3.2.25", features = ["derive", "env", "regex", "unicode", "wrap_help"] }
 goblin = "0.5.2"
 libc = "0.2.139"
-nix = "0.26.4"
+nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "term", "time", "user", "zerocopy"] }
 scroll = { version = "0.10", features = ["derive"] }
diff --git a/reverie-process/Cargo.toml b/reverie-process/Cargo.toml
index c2666a9..75359e5 100644
--- a/reverie-process/Cargo.toml
+++ b/reverie-process/Cargo.toml
@@ -14,7 +14,7 @@ bitflags = { version = "2.6", features = ["serde"] }
 colored = "2.1.0"
 futures = { version = "0.3.30", features = ["async-await", "compat"] }
 libc = "0.2.139"
-nix = "0.26.4"
+nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "term", "time", "user", "zerocopy"] }
 serde = { version = "1.0.185", features = ["derive", "rc"] }
 syscalls = { version = "0.6.7", features = ["serde"] }
 thiserror = "2"
diff --git a/reverie-ptrace/Cargo.toml b/reverie-ptrace/Cargo.toml
index 0cccfee..a6ab723 100644
--- a/reverie-ptrace/Cargo.toml
+++ b/reverie-ptrace/Cargo.toml
@@ -18,7 +18,7 @@ goblin = "0.5.2"
 iced-x86 = "1.17.0"
 lazy_static = "1.4"
 libc = "0.2.139"
-nix = "0.26.4"
+nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "term", "time", "user", "zerocopy"] }
 num-traits = { version = "0.2.18", default-features = false }
 paste = "1.0.14"
 perf-event-open-sys = "4.0"
diff --git a/reverie-ptrace/src/gdbstub/session.rs b/reverie-ptrace/src/gdbstub/session.rs
index 8864bce..64f76cc 100644
--- a/reverie-ptrace/src/gdbstub/session.rs
+++ b/reverie-ptrace/src/gdbstub/session.rs
@@ -7,6 +7,7 @@
  */
 
 use std::collections::BTreeMap;
+use std::os::fd::BorrowedFd;
 use std::sync::Arc;
 
 use bytes::Bytes;
@@ -327,7 +328,11 @@ impl Session {
                             Mode::from_bits_truncate(0o644),
                         )
                         .and_then(|fd| {
-                            let nb = uio::pread(fd, &mut auxv, offset as libc::off_t)?;
+                            let nb = uio::pread(
+                                unsafe { BorrowedFd::borrow_raw(fd) },
+                                &mut auxv,
+                                offset as libc::off_t,
+                            )?;
                             let _ = unistd::close(fd);
                             Ok(nb)
                         }) {
@@ -535,6 +540,7 @@ impl Session {
                     writer.put_str(unistd::close(fd).map_or("F-1", |_| "F0"));
                 }
                 vFile::Pread(fd, count, offset) => {
+                    let fd = unsafe { BorrowedFd::borrow_raw(fd) };
                     let count = std::cmp::min(count as usize, self.bufsiz);
                     let mut buf: Vec<u8> = vec![0; count];
                     match uio::pread(fd, &mut buf, offset as i64) {
@@ -549,15 +555,18 @@ impl Session {
                         }
                     }
                 }
-                vFile::Pwrite(fd, offset, data) => match uio::pwrite(fd, &data, offset as i64) {
-                    Ok(nb) => {
-                        writer.put_str("F");
-                        writer.put_num(nb);
-                    }
-                    Err(_) => {
-                        writer.put_str("F-1");
+                vFile::Pwrite(fd, offset, data) => {
+                    let fd = unsafe { BorrowedFd::borrow_raw(fd) };
+                    match uio::pwrite(fd, &data, offset as i64) {
+                        Ok(nb) => {
+                            writer.put_str("F");
+                            writer.put_num(nb);
+                        }
+                        Err(_) => {
+                            writer.put_str("F-1");
+                        }
                     }
-                },
+                }
                 vFile::Unlink(fname) => {
                     writer.put_str(unistd::unlink(&fname).map_or("F-1", |_| "F0"));
                 }
diff --git a/reverie-ptrace/src/tracer.rs b/reverie-ptrace/src/tracer.rs
index c3b4c76..b02987c 100644
--- a/reverie-ptrace/src/tracer.rs
+++ b/reverie-ptrace/src/tracer.rs
@@ -11,7 +11,7 @@
 use std::io::Write;
 use std::net::SocketAddr;
 use std::os::fd::AsRawFd;
-use std::os::fd::OwnedFd;
+use std::os::fd::BorrowedFd;
 use std::path::PathBuf;
 use std::sync::Arc;
 
@@ -571,8 +571,6 @@ where
     L: Tool + 'static,
     F: FnOnce(),
 {
-    use std::os::unix::io::FromRawFd;
-
     // Because this ptrace backend is CENTRALIZED, it can keep all the
     // tool's state here in a single address space.
     let global_state = <L::GlobalState as GlobalTool>::init_global_state(&config).await;
@@ -584,11 +582,6 @@ where
     let (read1, write1) = unistd::pipe().map_err(from_nix_error)?;
     let (read2, write2) = unistd::pipe().map_err(from_nix_error)?;
 
-    let read1 = unsafe { OwnedFd::from_raw_fd(read1) };
-    let write1 = unsafe { OwnedFd::from_raw_fd(write1) };
-    let read2 = unsafe { OwnedFd::from_raw_fd(read2) };
-    let write2 = unsafe { OwnedFd::from_raw_fd(write2) };
-
     // Disable io redirection just before forking. We want the child process to
     // be able to call `println!()` and have that output go to stdout.
     //
@@ -620,7 +613,7 @@ where
                 Err(e) => {
                     std::io::stdout().flush()?;
                     let _ = nix::unistd::write(
-                        2,
+                        unsafe { BorrowedFd::borrow_raw(2) },
                         format!("Forked Rust process panicked, cause: {:?}", e).as_ref(),
                     );
                     std::process::exit(1);
diff --git a/reverie-syscalls/Cargo.toml b/reverie-syscalls/Cargo.toml
index 453eae0..47eef99 100644
--- a/reverie-syscalls/Cargo.toml
+++ b/reverie-syscalls/Cargo.toml
@@ -12,7 +12,7 @@ license = "BSD-2-Clause"
 bitflags = { version = "2.6", features = ["serde"] }
 derive_more = { version = "1.0.0", features = ["full"] }
 libc = "0.2.139"
-nix = "0.26.4"
+nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "term", "time", "user", "zerocopy"] }
 paste = "1.0.14"
 reverie-memory = { version = "0.1.0", path = "../reverie-memory" }
 serde = { version = "1.0.185", features = ["derive", "rc"] }
diff --git a/reverie-syscalls/src/raw.rs b/reverie-syscalls/src/raw.rs
index a445798..16686f6 100644
--- a/reverie-syscalls/src/raw.rs
+++ b/reverie-syscalls/src/raw.rs
@@ -116,7 +116,7 @@ macro_rules! impl_raw_bits {
     ($t:ty : $inner:ty) => {
         impl $crate::FromToRaw for $t {
             fn from_raw(raw: usize) -> Self {
-                unsafe { Self::from_bits_unchecked(raw as $inner) }
+                Self::from_bits_retain(raw as $inner)
             }
 
             fn into_raw(self) -> usize {
diff --git a/reverie-syscalls/src/syscalls/mod.rs b/reverie-syscalls/src/syscalls/mod.rs
index 4bc5b73..89af93f 100644
--- a/reverie-syscalls/src/syscalls/mod.rs
+++ b/reverie-syscalls/src/syscalls/mod.rs
@@ -3563,7 +3563,7 @@ mod test {
         assert_eq!(
             format!("{}", syscall.display(&memory)),
             format!(
-                "openat(-100, {:p} -> \"/some/file/path\", O_APPEND)",
+                "openat(-100, {:p} -> \"/some/file/path\", OFlag(O_APPEND))",
                 name.as_ptr()
             )
         );
@@ -3585,7 +3585,7 @@ mod test {
                     .with_flags(OFlag::O_APPEND)
                     .display(&memory)
             ),
-            "openat(-100, NULL, O_APPEND)"
+            "openat(-100, NULL, OFlag(O_APPEND))"
         );
 
         assert_eq!(
@@ -3598,7 +3598,7 @@ mod test {
                     .with_mode(Some(Mode::from_bits_truncate(0o644)))
                     .display(&memory)
             ),
-            "openat(-100, NULL, O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)"
+            "openat(-100, NULL, OFlag(O_CREAT), Mode(S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))"
         );
 
         assert_eq!(
@@ -3611,7 +3611,7 @@ mod test {
                     .with_mode(Some(Mode::from_bits_truncate(0o600)))
                     .display(&memory)
             ),
-            "openat(-100, NULL, O_DIRECTORY | O_TMPFILE, S_IRUSR | S_IWUSR)"
+            "openat(-100, NULL, OFlag(O_DIRECTORY | O_TMPFILE), Mode(S_IRUSR | S_IWUSR))"
         );
 
         #[cfg(target_arch = "x86_64")]
@@ -3644,7 +3644,7 @@ mod test {
         assert_eq!(
             format!("{}", syscall.display_with_outputs(&memory)),
             format!(
-                "stat({:p} -> \"/dev/null\", {:p} -> {{st_mode=S_IFCHR | 0666, st_size=0, ...}})",
+                "stat({:p} -> \"/dev/null\", {:p} -> {{st_mode=SFlag(S_IFCHR) | 0666, st_size=0, ...}})",
                 name.as_ptr(),
                 &stat as *const _
             )
diff --git a/reverie/Cargo.toml b/reverie/Cargo.toml
index fe16a46..bcedeb6 100644
--- a/reverie/Cargo.toml
+++ b/reverie/Cargo.toml
@@ -19,7 +19,7 @@ libc = "0.2.139"
 linked-hash-map = { version = "0.5", features = ["serde_impl"] }
 memmap2 = "0.5.10"
 never-say-never = "6"
-nix = "0.26.4"
+nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "term", "time", "user", "zerocopy"] }
 object = { version = "0.29", features = ["write"] }
 procfs = "0.15.1"
 raw-cpuid = "10.6.0"
diff --git a/safeptrace/Cargo.toml b/safeptrace/Cargo.toml
index fe60065..2953401 100644
--- a/safeptrace/Cargo.toml
+++ b/safeptrace/Cargo.toml
@@ -13,7 +13,7 @@ bitflags = { version = "2.6", features = ["serde"] }
 futures = { version = "0.3.30", features = ["async-await", "compat"] }
 lazy_static = "1.4"
 libc = "0.2.139"
-nix = "0.26.4"
+nix = { version = "0.29.0", features = ["dir", "event", "hostname", "inotify", "ioctl", "mman", "mount", "net", "poll", "ptrace", "reboot", "resource", "sched", "term", "time", "user", "zerocopy"] }
 parking_lot = { version = "0.12.1", features = ["send_guard"] }
 reverie-memory = { version = "0.1.0", path = "../reverie-memory", optional = true }
 reverie-process = { version = "0.1.0", path = "../reverie-process" }
diff --git a/safeptrace/src/lib.rs b/safeptrace/src/lib.rs
index 04f8e9a..2698d2b 100644
--- a/safeptrace/src/lib.rs
+++ b/safeptrace/src/lib.rs
@@ -980,6 +980,7 @@ pub fn traceme_and_stop() -> Result<(), Errno> {
 #[cfg(test)]
 mod test {
     use std::io;
+    use std::os::fd::BorrowedFd;
     use std::thread;
 
     use nix::sys::signal;
@@ -1305,7 +1306,7 @@ mod test {
         _siginfo: *mut libc::siginfo_t,
         _ucontext: *const libc::c_void,
     ) {
-        nix::unistd::write(2, b"caught SIGALRM!").unwrap();
+        nix::unistd::write(unsafe { BorrowedFd::borrow_raw(2) }, b"caught SIGALRM!").unwrap();
     }
 
     #[allow(dead_code)]
diff --git a/safeptrace/src/memory.rs b/safeptrace/src/memory.rs
index 8fe5f70..5d015a7 100644
--- a/safeptrace/src/memory.rs
+++ b/safeptrace/src/memory.rs
@@ -7,6 +7,7 @@
  */
 
 use core::mem;
+use std::ffi::c_long;
 use std::io;
 
 use nix::sys::ptrace;
@@ -51,7 +52,7 @@ impl Stopped {
             ptrace::write(
                 self.0.into(),
                 addr.as_mut_ptr() as *mut ::core::ffi::c_void,
-                value as *mut ::core::ffi::c_void,
+                value as c_long,
             )
         }
         .map_err(|err| Errno::new(err as i32))
diff --git a/tests/basics.rs b/tests/basics.rs
index 8e7fd3a..5ab221f 100644
--- a/tests/basics.rs
+++ b/tests/basics.rs
@@ -12,6 +12,8 @@
 use std::ffi::CString;
 #[allow(unused_imports)]
 use std::io::Write;
+#[allow(unused_imports)]
+use std::os::fd::AsRawFd;
 use std::sync::atomic::AtomicU64;
 use std::sync::atomic::Ordering;
 
@@ -265,17 +267,17 @@ fn child_should_inherit_fds() {
         let msg: [u8; 8] = [0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8];
         match unsafe { unistd::fork() } {
             Ok(ForkResult::Parent { child, .. }) => {
-                assert!(unistd::close(fdwrite).is_ok());
+                drop(fdwrite);
                 let mut buf: [u8; 8] = [0; 8];
-                assert_eq!(unistd::read(fdread, &mut buf), Ok(8));
+                assert_eq!(unistd::read(fdread.as_raw_fd(), &mut buf), Ok(8));
                 assert_eq!(buf, msg);
                 assert_eq!(wait::waitpid(child, None), Ok(WaitStatus::Exited(child, 0)));
                 unsafe { libc::syscall(libc::SYS_exit_group, 0) };
                 unreachable!();
             }
             Ok(ForkResult::Child) => {
-                assert!(unistd::close(fdread).is_ok());
-                assert_eq!(unistd::write(fdwrite, &msg), Ok(8));
+                drop(fdread);
+                assert_eq!(unistd::write(&fdwrite, &msg), Ok(8));
                 unsafe { libc::syscall(libc::SYS_exit_group, 0) };
                 unreachable!();
             }
diff --git a/tests/delay_signal.rs b/tests/delay_signal.rs
index 6cfec0d..b3e45e2 100644
--- a/tests/delay_signal.rs
+++ b/tests/delay_signal.rs
@@ -142,6 +142,7 @@ impl Tool for LocalState {
 mod tests {
     use std::io;
     use std::mem::MaybeUninit;
+    use std::os::fd::BorrowedFd;
     use std::sync::mpsc;
     use std::thread;
     use std::time;
@@ -217,7 +218,7 @@ mod tests {
         _siginfo: *mut libc::siginfo_t,
         _ucontext: *const libc::c_void,
     ) {
-        nix::unistd::write(2, b"caught SIGPROF!").unwrap();
+        nix::unistd::write(unsafe { BorrowedFd::borrow_raw(2) }, b"caught SIGPROF!").unwrap();
         unsafe {
             libc::syscall(libc::SYS_exit_group, 0);
         }
diff --git a/tests/parallelism.rs b/tests/parallelism.rs
index fb1a99f..b8b3224 100644
--- a/tests/parallelism.rs
+++ b/tests/parallelism.rs
@@ -7,7 +7,6 @@
  */
 
 //! Tests for parallelism and concurrency
-
 use reverie::syscalls::Syscall;
 use reverie::Error;
 use reverie::GlobalTool;
@@ -75,21 +74,25 @@ impl Tool for TestTool {
 #[test]
 #[cfg(not(sanitized))]
 pub fn delay_childprint_test() {
+    use std::os::fd::BorrowedFd;
+
     use reverie::ExitStatus;
     use reverie_ptrace::testing::print_tracee_output;
     use reverie_ptrace::testing::test_fn;
 
+    let fd1 = unsafe { BorrowedFd::borrow_raw(1) };
+
     let (output, _state) = test_fn::<TestTool, _>(|| {
         let child = std::thread::spawn(move || {
             for _ in 0..2 {
-                nix::unistd::write(1, b"a").unwrap();
+                nix::unistd::write(fd1, b"a").unwrap();
             }
         });
         for _ in 0..100 {
-            nix::unistd::write(1, b"b").unwrap();
+            nix::unistd::write(fd1, b"b").unwrap();
         }
         child.join().unwrap();
-        nix::unistd::write(1, b"\n").unwrap();
+        nix::unistd::write(fd1, b"\n").unwrap();
     })
     .unwrap();