diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index b8cac72..b652e6e 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -40,7 +40,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest]
         rust:
-          - 1.65.0
+          - 1.66.0
         target:
           - ""
         features:
diff --git a/src/unix.rs b/src/unix.rs
index c36520a..ed53bac 100644
--- a/src/unix.rs
+++ b/src/unix.rs
@@ -1,6 +1,7 @@
 use crate::{Clock, LeapIndicator, TimeOffset, Timestamp};
 use std::{
-    os::unix::prelude::{AsRawFd, FromRawFd, RawFd},
+    os::unix::io::IntoRawFd,
+    os::unix::prelude::{FromRawFd, RawFd},
     path::Path,
     time::Duration,
 };
@@ -46,9 +47,14 @@ impl UnixClock {
     /// ```
     pub fn open(path: impl AsRef<Path>) -> std::io::Result<Self> {
         let file = std::fs::File::open(path)?;
-        Ok(Self::safe_from_raw_fd(file.as_raw_fd()))
+
+        // we need an owned fd. the file will be closed when the process exits.
+        Ok(Self::safe_from_raw_fd(file.into_raw_fd()))
     }
 
+    // Consume the fd and produce a clock id. Clock id is only valid
+    // so long as the fd is open, so the RawFd here should
+    // not be borrowed.
     fn safe_from_raw_fd(fd: RawFd) -> Self {
         let clock = ((!(fd as libc::clockid_t)) << 3) | 3;