diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index 04a2153ff..a0ab47f9f 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -1952,6 +1952,7 @@ dependencies = [
  "ip_network",
  "ipconfig",
  "known-folders",
+ "libc",
  "mutants",
  "nix 0.28.0",
  "resolv-conf",
@@ -1967,7 +1968,6 @@ dependencies = [
  "tokio-util",
  "tracing",
  "tracing-subscriber",
- "uptime_lib",
  "url",
  "uuid",
  "windows 0.57.0",
@@ -6976,17 +6976,6 @@ version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
 
-[[package]]
-name = "uptime_lib"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4e71ddbefed856d5881821d6ada4e606bbb91fd332296963ed596e2ad2100f3"
-dependencies = [
- "libc",
- "thiserror",
- "windows 0.52.0",
-]
-
 [[package]]
 name = "url"
 version = "2.5.0"
diff --git a/rust/headless-client/Cargo.toml b/rust/headless-client/Cargo.toml
index fe4265e50..1d250bd25 100644
--- a/rust/headless-client/Cargo.toml
+++ b/rust/headless-client/Cargo.toml
@@ -28,7 +28,6 @@ tokio = { version = "1.38.0", features = ["macros", "signal"] }
 tokio-util = { version = "0.7.11", features = ["codec"] }
 tracing = { workspace = true }
 tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
-uptime_lib = "0.3.0"
 url = { version = "2.3.1", default-features = false }
 uuid = { version = "1.7", default-features = false, features = ["std", "v4", "serde"] }
 
@@ -40,6 +39,7 @@ mutants = "0.0.3" # Needed to mark functions as exempt from `cargo-mutants` test
 
 [target.'cfg(target_os = "linux")'.dependencies]
 dirs = "5.0.1"
+libc = "0.2.150"
 nix = { version =  "0.28.0", features = ["fs", "user"] }
 resolv-conf = "0.7.0"
 rtnetlink = { workspace = true }
@@ -65,8 +65,8 @@ features = [
     "Win32_NetworkManagement_Ndis",
     "Win32_Networking_WinSock",
 
-    # For named pipe IPC
-    "Win32_Security",
+    "Win32_Security", # For named pipe IPC
+    "Win32_System_SystemInformation", # For uptime
     "Win32_System_SystemServices",
     "Win32_System_Pipes",
 ]
diff --git a/rust/headless-client/src/heartbeat.rs b/rust/headless-client/src/heartbeat.rs
index bee03a76b..c5a38dbc5 100644
--- a/rust/headless-client/src/heartbeat.rs
+++ b/rust/headless-client/src/heartbeat.rs
@@ -5,6 +5,7 @@
 //! state, so this heartbeat allows us to estimate roughly how long each process stayed
 //! up when looking at user logs, using unlimited disk space per run of the app.
 
+use crate::uptime;
 use std::time::Duration;
 use tokio::time::{sleep_until, Instant};
 
@@ -13,7 +14,7 @@ pub async fn heartbeat() {
     let mut hb = Heartbeat::default();
     loop {
         sleep_until(hb.next_instant).await;
-        let system_uptime = uptime_lib::get().ok();
+        let system_uptime = uptime::get();
         tracing::info!(?system_uptime, "Heartbeat");
         hb.tick();
     }
diff --git a/rust/headless-client/src/lib.rs b/rust/headless-client/src/lib.rs
index 5a3963560..ad24febb7 100644
--- a/rust/headless-client/src/lib.rs
+++ b/rust/headless-client/src/lib.rs
@@ -33,6 +33,7 @@ pub mod heartbeat;
 mod ipc_service;
 pub mod known_dirs;
 mod standalone;
+mod uptime;
 
 #[cfg(target_os = "linux")]
 #[path = "linux.rs"]
diff --git a/rust/headless-client/src/uptime/README.md b/rust/headless-client/src/uptime/README.md
new file mode 100644
index 000000000..9bad25eea
--- /dev/null
+++ b/rust/headless-client/src/uptime/README.md
@@ -0,0 +1 @@
+Manually vendored from `uptime_lib` 0.3.0, https://github.com/itchyny/uptime-rs/tree/e6e31f4aa69b057d0610c20f8f2b5f8f0724decb
diff --git a/rust/headless-client/src/uptime/mod.rs b/rust/headless-client/src/uptime/mod.rs
new file mode 100644
index 000000000..8d848e1af
--- /dev/null
+++ b/rust/headless-client/src/uptime/mod.rs
@@ -0,0 +1,54 @@
+// Manually vendored from https://github.com/itchyny/uptime-rs/blob/e6e31f4aa69b057d0610c20f8f2b5f8f0724decb/src/lib.rs and https://github.com/itchyny/uptime-rs/blob/e6e31f4aa69b057d0610c20f8f2b5f8f0724decb/tests/lib.rs
+
+/*
+The MIT License (MIT)
+
+Copyright (c) 2017-2023 itchyny <https://github.com/itchyny>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+use std::time::Duration;
+
+#[cfg(target_os = "linux")]
+pub fn get() -> Option<Duration> {
+    let mut info: libc::sysinfo = unsafe { std::mem::zeroed() };
+    let ret = unsafe { libc::sysinfo(&mut info) };
+    if ret == 0 {
+        Some(Duration::from_secs(info.uptime as u64))
+    } else {
+        None
+    }
+}
+
+#[cfg(target_os = "windows")]
+// `Result` is needed to match other platforms' signatures
+#[allow(clippy::unnecessary_wraps)]
+pub fn get() -> Option<Duration> {
+    let ret: u64 = unsafe { windows::Win32::System::SystemInformation::GetTickCount64() };
+    Some(Duration::from_millis(ret))
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_uptime_get() {
+        assert!(super::get().is_some());
+    }
+}