diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index 692ca11..4dbf890 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,6 +1,6 @@
 {
   "git": {
-    "sha1": "8fbe34239c16af9cd253e36e9c2d3384f9b55f83"
+    "sha1": "ca9cc93b392fa1d0eb4eb2a60c74b3b3ecff03bb"
   },
   "path_in_vcs": ""
 }
\ No newline at end of file
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index dd380d3..aa13ec5 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -28,7 +28,7 @@
     name: Clippy [Linter]
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-latest, windows-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Setup | Checkout
@@ -46,7 +46,7 @@
         uses: actions-rs/cargo@v1
         with:
           command: clippy
-          args: --workspace --all-targets --all-features
+          args: --workspace --all-targets --all-features -- -Dwarnings
 
   # Ensure that the project could be successfully compiled
   cargo_check:
@@ -75,7 +75,7 @@
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-latest, windows-latest, macos-latest]
         rust: [stable, nightly]
     steps:
       - name: Setup | Checkout
diff --git a/Android.bp b/Android.bp
index 3d469f9..d41ae65 100644
--- a/Android.bp
+++ b/Android.bp
@@ -23,7 +23,7 @@
     host_supported: true,
     crate_name: "which",
     cargo_env_compat: true,
-    cargo_pkg_version: "4.2.4",
+    cargo_pkg_version: "4.2.5",
     srcs: ["src/lib.rs"],
     edition: "2018",
     rustlibs: [
diff --git a/Cargo.toml b/Cargo.toml
index 850a29c..3e5545f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@
 [package]
 edition = "2018"
 name = "which"
-version = "4.2.4"
+version = "4.2.5"
 authors = ["Harry Fei <tiziyuanfang@gmail.com>"]
 description = "A Rust equivalent of Unix command \"which\". Locate installed executable in cross platforms."
 documentation = "https://docs.rs/which/"
@@ -24,15 +24,15 @@
 [package.metadata.docs.rs]
 all-features = true
 [dependencies.either]
-version = "1.6"
+version = "1.6.1"
 
 [dependencies.libc]
-version = "0.2.65"
+version = "0.2.121"
 
 [dependencies.regex]
-version = "1.5.4"
+version = "1.5.5"
 optional = true
-[dev-dependencies.tempdir]
-version = "0.3.7"
+[dev-dependencies.tempfile]
+version = "3.3.0"
 [target."cfg(windows)".dependencies.lazy_static]
-version = "1"
+version = "1.4.0"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index ec31c55..dccbdb4 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,6 +1,6 @@
 [package]
 name = "which"
-version = "4.2.4"
+version = "4.2.5"
 edition = "2018"
 authors = ["Harry Fei <tiziyuanfang@gmail.com>"]
 repository = "https://github.com/harryfei/which-rs.git"
@@ -12,15 +12,15 @@
 keywords = ["which", "which-rs", "unix", "command"]
 
 [dependencies]
-either = "1.6"
-libc = "0.2.65"
-regex = { version = "1.5.4", optional = true }
+either = "1.6.1"
+libc = "0.2.121"
+regex = { version = "1.5.5", optional = true }
 
 [target.'cfg(windows)'.dependencies]
-lazy_static = "1"
+lazy_static = "1.4.0"
 
 [dev-dependencies]
-tempdir = "0.3.7"
+tempfile = "3.3.0"
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/METADATA b/METADATA
index 6a034c4..9d9dd01 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/which/which-4.2.4.crate"
+    value: "https://static.crates.io/crates/which/which-4.2.5.crate"
   }
-  version: "4.2.4"
+  version: "4.2.5"
   license_type: NOTICE
   last_upgrade_date {
     year: 2022
-    month: 3
-    day: 1
+    month: 4
+    day: 18
   }
 }
diff --git a/TEST_MAPPING b/TEST_MAPPING
index e4ec3b3..96a0732 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -7,6 +7,9 @@
   ],
   "presubmit": [
     {
+      "name": "keystore2_legacy_blobs_test"
+    },
+    {
       "name": "keystore2_test"
     },
     {
@@ -15,6 +18,9 @@
   ],
   "presubmit-rust": [
     {
+      "name": "keystore2_legacy_blobs_test"
+    },
+    {
       "name": "keystore2_test"
     },
     {
diff --git a/src/checker.rs b/src/checker.rs
index 62b78a2..0e92c6a 100644
--- a/src/checker.rs
+++ b/src/checker.rs
@@ -1,7 +1,5 @@
 use crate::finder::Checker;
 #[cfg(unix)]
-use libc;
-#[cfg(unix)]
 use std::ffi::CString;
 use std::fs;
 #[cfg(unix)]
@@ -20,7 +18,7 @@
     #[cfg(unix)]
     fn is_valid(&self, path: &Path) -> bool {
         CString::new(path.as_os_str().as_bytes())
-            .and_then(|c| Ok(unsafe { libc::access(c.as_ptr(), libc::X_OK) == 0 }))
+            .map(|c| unsafe { libc::access(c.as_ptr(), libc::X_OK) == 0 })
             .unwrap_or(false)
     }
 
diff --git a/src/finder.rs b/src/finder.rs
index 43b659d..9b64294 100644
--- a/src/finder.rs
+++ b/src/finder.rs
@@ -94,6 +94,9 @@
         T: AsRef<OsStr>,
     {
         let p = paths.ok_or(Error::CannotFindBinaryPath)?;
+        // Collect needs to happen in order to not have to
+        // change the API to borrow on `paths`.
+        #[allow(clippy::needless_collect)]
         let paths: Vec<_> = env::split_paths(&p).collect();
 
         let matching_re = paths
@@ -169,7 +172,7 @@
                     })
                     // PATHEXT not being set or not being a proper Unicode string is exceedingly
                     // improbable and would probably break Windows badly. Still, don't crash:
-                    .unwrap_or(vec![]);
+                    .unwrap_or_default();
         }
 
         paths
diff --git a/tests/basic.rs b/tests/basic.rs
index 897e912..59c5fb0 100644
--- a/tests/basic.rs
+++ b/tests/basic.rs
@@ -1,14 +1,13 @@
-extern crate tempdir;
 extern crate which;
 
-#[cfg(feature = "regex")]
+#[cfg(all(unix, feature = "regex"))]
 use regex::Regex;
 use std::ffi::{OsStr, OsString};
 use std::fs;
 use std::io;
 use std::path::{Path, PathBuf};
 use std::{env, vec};
-use tempdir::TempDir;
+use tempfile::TempDir;
 
 struct TestFixture {
     /// Temp directory.
@@ -19,8 +18,8 @@
     pub bins: Vec<PathBuf>,
 }
 
-const SUBDIRS: &'static [&'static str] = &["a", "b", "c"];
-const BIN_NAME: &'static str = "bin";
+const SUBDIRS: &[&str] = &["a", "b", "c"];
+const BIN_NAME: &str = "bin";
 
 #[cfg(unix)]
 fn mk_bin(dir: &Path, path: &str, extension: &str) -> io::Result<PathBuf> {
@@ -55,7 +54,7 @@
     // tmp/c/bin.exe
     // tmp/c/bin.cmd
     pub fn new() -> TestFixture {
-        let tempdir = TempDir::new("which_tests").unwrap();
+        let tempdir = tempfile::tempdir().unwrap();
         let mut builder = fs::DirBuilder::new();
         builder.recursive(true);
         let mut paths = vec![];
@@ -63,25 +62,25 @@
         for d in SUBDIRS.iter() {
             let p = tempdir.path().join(d);
             builder.create(&p).unwrap();
-            bins.push(mk_bin(&p, &BIN_NAME, "").unwrap());
-            bins.push(mk_bin(&p, &BIN_NAME, "exe").unwrap());
-            bins.push(mk_bin(&p, &BIN_NAME, "cmd").unwrap());
+            bins.push(mk_bin(&p, BIN_NAME, "").unwrap());
+            bins.push(mk_bin(&p, BIN_NAME, "exe").unwrap());
+            bins.push(mk_bin(&p, BIN_NAME, "cmd").unwrap());
             paths.push(p);
         }
         TestFixture {
-            tempdir: tempdir,
+            tempdir,
             paths: env::join_paths(paths).unwrap(),
-            bins: bins,
+            bins,
         }
     }
 
     #[allow(dead_code)]
     pub fn touch(&self, path: &str, extension: &str) -> io::Result<PathBuf> {
-        touch(self.tempdir.path(), &path, &extension)
+        touch(self.tempdir.path(), path, extension)
     }
 
     pub fn mk_bin(&self, path: &str, extension: &str) -> io::Result<PathBuf> {
-        mk_bin(self.tempdir.path(), &path, &extension)
+        mk_bin(self.tempdir.path(), path, extension)
     }
 }
 
@@ -89,11 +88,11 @@
     which::CanonicalPath::new_in(path, Some(f.paths.clone()), f.tempdir.path())
 }
 
-fn _which_all<T: AsRef<OsStr>>(
-    f: &TestFixture,
+fn _which_all<'a, T: AsRef<OsStr> + 'a>(
+    f: &'a TestFixture,
     path: T,
-) -> which::Result<impl Iterator<Item = which::Result<which::CanonicalPath>>> {
-    which::CanonicalPath::all_in(path, Some(f.paths.clone()), f.tempdir.path().to_path_buf())
+) -> which::Result<impl Iterator<Item = which::Result<which::CanonicalPath>> + '_> {
+    which::CanonicalPath::all_in(path, Some(f.paths.clone()), f.tempdir.path())
 }
 
 #[test]
@@ -165,10 +164,18 @@
 #[test]
 #[cfg(all(unix, feature = "regex"))]
 fn test_which_re_accepts_owned_and_borrow() {
-    which::which_re(Regex::new(r".").unwrap());
-    which::which_re(&Regex::new(r".").unwrap());
-    which::which_re_in(Regex::new(r".").unwrap(), Some("pth"));
-    which::which_re_in(&Regex::new(r".").unwrap(), Some("pth"));
+    which::which_re(Regex::new(r".").unwrap())
+        .unwrap()
+        .for_each(drop);
+    which::which_re(&Regex::new(r".").unwrap())
+        .unwrap()
+        .for_each(drop);
+    which::which_re_in(Regex::new(r".").unwrap(), Some("pth"))
+        .unwrap()
+        .for_each(drop);
+    which::which_re_in(&Regex::new(r".").unwrap(), Some("pth"))
+        .unwrap()
+        .for_each(drop);
 }
 
 #[test]