diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7e2d47c..cc4211e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         rust_version: ['1.60.0', 'stable', 'nightly']
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        os: [ubuntu-20.04, ubuntu-22.04, macOS-11, macOS-12, windows-2019, windows-2022]
     steps:
     - uses: actions/checkout@v3
     - name: Install Rust ${{ matrix.rust_version }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb96ea7..8bd3056 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,12 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased] - ReleaseDate
 
+### Fixed
+
+- Fixed an issue with the monotonic clock for macOS/iOS where it would undermeasure time compared to
+  what would be measured by `std::time::Instant` due to using a clock source that did not account
+  for device sleep.
+
 ## [0.12.1] - 2023-10-31
 
 ### Fixed
diff --git a/Cargo.toml b/Cargo.toml
index d9e4272..3ec5693 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -47,15 +47,9 @@ raw-cpuid = "11.0"
 [target.'cfg(target_arch = "x86_64")'.dependencies]
 raw-cpuid = "11.0"
 
-[target.'cfg(not(any(target_os = "macos", target_os = "ios", target_os = "windows", target_arch = "wasm32")))'.dependencies]
+[target.'cfg(not(any(target_os = "windows", target_arch = "wasm32")))'.dependencies]
 libc = "0.2"
 
-[target.'cfg(target_os = "macos")'.dependencies]
-mach2 = "0.4"
-
-[target.'cfg(target_os = "ios")'.dependencies]
-mach2 = "0.4"
-
 [target.'cfg(target_os = "windows")'.dependencies]
 winapi = { version = "0.3", features = ["profileapi"] }
 
diff --git a/src/clocks/monotonic/macos.rs b/src/clocks/monotonic/macos.rs
deleted file mode 100644
index 8c3ea9f..0000000
--- a/src/clocks/monotonic/macos.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-use mach2::mach_time::{mach_absolute_time, mach_timebase_info};
-
-#[derive(Clone, Copy, Debug)]
-pub struct Monotonic {
-    factor: u64,
-}
-impl Monotonic {
-    pub fn now(&self) -> u64 {
-        let raw = unsafe { mach_absolute_time() };
-        raw * self.factor
-    }
-}
-
-impl Default for Monotonic {
-    fn default() -> Self {
-        let mut info = mach_timebase_info { numer: 0, denom: 0 };
-        unsafe {
-            mach_timebase_info(&mut info);
-        }
-
-        let factor = u64::from(info.numer) / u64::from(info.denom);
-        Self { factor }
-    }
-}
diff --git a/src/clocks/monotonic/mod.rs b/src/clocks/monotonic/mod.rs
index 3960e4f..b746333 100644
--- a/src/clocks/monotonic/mod.rs
+++ b/src/clocks/monotonic/mod.rs
@@ -1,8 +1,3 @@
-#[cfg(any(target_os = "macos", target_os = "ios"))]
-mod macos;
-#[cfg(any(target_os = "macos", target_os = "ios"))]
-pub use self::macos::Monotonic;
-
 #[cfg(target_os = "windows")]
 mod windows;
 #[cfg(target_os = "windows")]
@@ -13,17 +8,7 @@ mod wasm;
 #[cfg(target_arch = "wasm32")]
 pub use self::wasm::Monotonic;
 
-#[cfg(not(any(
-    target_os = "macos",
-    target_os = "ios",
-    target_os = "windows",
-    target_arch = "wasm32"
-)))]
+#[cfg(not(any(target_os = "windows", target_arch = "wasm32")))]
 mod unix;
-#[cfg(not(any(
-    target_os = "macos",
-    target_os = "ios",
-    target_os = "windows",
-    target_arch = "wasm32"
-)))]
+#[cfg(not(any(target_os = "windows", target_arch = "wasm32")))]
 pub use self::unix::Monotonic;