diff --git a/.github/workflows/full_ci.yml b/.github/workflows/full_ci.yml
index d22084889d292..042d81b158c0c 100644
--- a/.github/workflows/full_ci.yml
+++ b/.github/workflows/full_ci.yml
@@ -31,12 +31,12 @@ jobs:
       contents: read # to fetch code (actions/checkout)
 
     name: macOS
-    runs-on: macos-13
+    runs-on: macos-14
     strategy:
       fail-fast: true
       matrix:
         target: [
-          x86_64-apple-darwin,
+          aarch64-apple-darwin,
         ]
     steps:
       - uses: actions/checkout@v4
@@ -179,10 +179,10 @@ jobs:
       max-parallel: 4
       matrix:
         target:
-          - { toolchain: stable, os: macos-13 }
-          - { toolchain: beta, os: macos-13 }
-          - { toolchain: nightly, os: macos-13 }
-          - { toolchain: 1.71.0, os: macos-13 }
+          - { toolchain: stable, os: macos-14 }
+          - { toolchain: beta, os: macos-14 }
+          - { toolchain: nightly, os: macos-14 }
+          - { toolchain: 1.71.0, os: macos-14 }
     runs-on: ${{ matrix.target.os }}
     steps:
       - uses: actions/checkout@v4
diff --git a/ci/build.sh b/ci/build.sh
index e22b893222312..696a23eb534d8 100644
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -147,8 +147,6 @@ x86_64-unknown-redox \
 
 RUST_APPLE_TARGETS="\
 aarch64-apple-ios \
-x86_64-apple-darwin \
-x86_64-apple-ios \
 "
 
 RUST_NIGHTLY_APPLE_TARGETS="\
diff --git a/libc-test/build.rs b/libc-test/build.rs
index 767a4baf49b74..20cb56e9869ad 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -294,6 +294,8 @@ fn test_apple(target: &str) {
             "tcp_connection_info" => true,
             // FIXME: The size is changed in recent macOSes.
             "malloc_introspection_t" => true,
+            // sonoma changes the padding `rmx_filler` field.
+            "rt_metrics" => true,
 
             _ => false,
         }
diff --git a/src/fixed_width_ints.rs b/src/fixed_width_ints.rs
index 7a6f6cfaedb9b..f24fa5dd2d1d7 100644
--- a/src/fixed_width_ints.rs
+++ b/src/fixed_width_ints.rs
@@ -20,7 +20,7 @@ pub type uint32_t = u32;
 pub type uint64_t = u64;
 
 cfg_if! {
-    if #[cfg(all(target_arch = "aarch64", not(target_os = "windows")))] {
+    if #[cfg(all(target_arch = "aarch64", not(any(target_os = "windows", target_os = "macos", target_os = "ios", target_os = "tvos", target_os = "watchos"))))] {
         // This introduces partial support for FFI with __int128 and
         // equivalent types on platforms where Rust's definition is validated
         // to match the standard C ABI of that platform.
@@ -92,5 +92,10 @@ cfg_if! {
 
         // static_assert_eq!(core::mem::size_of::<__uint128_t>(), _SIZE_128);
         // static_assert_eq!(core::mem::align_of::<__uint128_t>(), _ALIGN_128);
+    } else if #[cfg(all(target_arch = "aarch64", any(target_os = "macos", target_os = "ios", target_os = "tvos", target_os = "watchos")))] {
+        /// /// C `__int128_t`
+        pub type __int128_t = i128;
+        /// /// C `__uint128_t`
+        pub type __uint128_t = u128;
     }
 }
diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index d19c0e9dd9cea..ff3326475970d 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -493,8 +493,7 @@ s! {
         pub rmx_rtt: u32,
         pub rmx_rttvar: u32,
         pub rmx_pksent: u32,
-        pub rmx_state: u32,
-        pub rmx_filler: [u32; 3],
+        pub rmx_filler: [u32; 4],
     }
 
     pub struct rt_msghdr {
@@ -6296,7 +6295,6 @@ extern "C" {
         out_processor_infoCnt: *mut mach_msg_type_number_t,
     ) -> ::kern_return_t;
 
-    pub static mut mach_task_self_: ::mach_port_t;
     pub fn task_for_pid(
         host: ::mach_port_t,
         pid: ::pid_t,
@@ -6413,10 +6411,6 @@ extern "C" {
     ) -> ::c_int;
 }
 
-pub unsafe fn mach_task_self() -> ::mach_port_t {
-    mach_task_self_
-}
-
 cfg_if! {
     if #[cfg(target_os = "macos")] {
         extern "C" {