diff --git a/Cargo.lock b/Cargo.lock
index 091758278..c74f4e2be 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1277,9 +1277,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.5.2"
+version = "1.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1efb2352a0f4d4b128f734b5c44c79ff80117351138733f12f982fe3e2b13343"
+checksum = "ce5f1ceb7f74abbce32601642fcf8e8508a8a8991e0621c7d750295b9095702b"
 dependencies = [
  "aho-corasick",
  "memchr 2.4.0",
@@ -1297,9 +1297,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.24"
+version = "0.6.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00efb87459ba4f6fb2169d20f68565555688e1250ee6825cdf6254f8b48fafb2"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
 
 [[package]]
 name = "remove_dir_all"
diff --git a/src/uu/cat/src/splice.rs b/src/uu/cat/src/splice.rs
index ccc625467..bd6be60f1 100644
--- a/src/uu/cat/src/splice.rs
+++ b/src/uu/cat/src/splice.rs
@@ -81,7 +81,7 @@ fn copy_exact(read_fd: RawFd, write_fd: RawFd, num_bytes: usize) -> nix::Result<
     let mut buf = [0; BUF_SIZE];
     loop {
         let read = unistd::read(read_fd, &mut buf[..left])?;
-        let written = unistd::write(write_fd, &mut buf[..read])?;
+        let written = unistd::write(write_fd, &buf[..read])?;
         left -= written;
         if left == 0 {
             break;
diff --git a/src/uu/cp/src/cp.rs b/src/uu/cp/src/cp.rs
index ca564e37c..3d6faf66a 100644
--- a/src/uu/cp/src/cp.rs
+++ b/src/uu/cp/src/cp.rs
@@ -551,6 +551,10 @@ impl FromStr for Attribute {
 fn add_all_attributes() -> Vec<Attribute> {
     use Attribute::*;
 
+    #[cfg(target_os = "windows")]
+    let attr = vec![Ownership, Timestamps, Context, Xattr, Links];
+
+    #[cfg(not(target_os = "windows"))]
     let mut attr = vec![Ownership, Timestamps, Context, Xattr, Links];
 
     #[cfg(unix)]
diff --git a/src/uu/date/src/date.rs b/src/uu/date/src/date.rs
index 43573437d..317fd72d4 100644
--- a/src/uu/date/src/date.rs
+++ b/src/uu/date/src/date.rs
@@ -348,7 +348,7 @@ fn set_system_datetime(_date: DateTime<Utc>) -> i32 {
 #[cfg(target_os = "macos")]
 fn set_system_datetime(_date: DateTime<Utc>) -> i32 {
     eprintln!("date: setting the date is not supported by macOS");
-    return 1;
+    1
 }
 
 #[cfg(all(unix, not(target_os = "macos")))]
diff --git a/src/uu/factor/src/factor.rs b/src/uu/factor/src/factor.rs
index 5a85194c4..138254b51 100644
--- a/src/uu/factor/src/factor.rs
+++ b/src/uu/factor/src/factor.rs
@@ -172,7 +172,7 @@ pub fn factor(mut n: u64) -> Factors {
     #[cfg(feature = "coz")]
     coz::end!("factorization");
 
-    return r;
+    r
 }
 
 #[cfg(test)]
diff --git a/src/uu/ls/src/ls.rs b/src/uu/ls/src/ls.rs
index dc7ea4c08..381612189 100644
--- a/src/uu/ls/src/ls.rs
+++ b/src/uu/ls/src/ls.rs
@@ -39,8 +39,6 @@ use std::{
     time::Duration,
 };
 
-use chrono;
-
 use term_grid::{Cell, Direction, Filling, Grid, GridOptions};
 
 use unicode_width::UnicodeWidthStr;
diff --git a/tests/by-util/test_relpath.rs b/tests/by-util/test_relpath.rs
index cc17b45c3..5094d25a8 100644
--- a/tests/by-util/test_relpath.rs
+++ b/tests/by-util/test_relpath.rs
@@ -103,7 +103,7 @@ fn test_relpath_with_from_with_d() {
         at.mkdir_all(from);
 
         // d is part of subpath -> expect relative path
-        let mut result_stdout = scene
+        let mut _result_stdout = scene
             .ucmd()
             .arg(to)
             .arg(from)
@@ -112,17 +112,17 @@ fn test_relpath_with_from_with_d() {
             .stdout_move_str();
         // relax rules for windows test environment
         #[cfg(not(windows))]
-        assert!(Path::new(&result_stdout).is_relative());
+        assert!(Path::new(&_result_stdout).is_relative());
 
         // d is not part of subpath -> expect absolut path
-        result_stdout = scene
+        _result_stdout = scene
             .ucmd()
             .arg(to)
             .arg(from)
             .arg("-dnon_existing")
             .succeeds()
             .stdout_move_str();
-        assert!(Path::new(&result_stdout).is_absolute());
+        assert!(Path::new(&_result_stdout).is_absolute());
     }
 }
 
@@ -135,12 +135,12 @@ fn test_relpath_no_from_no_d() {
         let to: &str = &convert_path(test.to);
         at.mkdir_all(to);
 
-        let result_stdout = scene.ucmd().arg(to).succeeds().stdout_move_str();
+        let _result_stdout = scene.ucmd().arg(to).succeeds().stdout_move_str();
         #[cfg(not(windows))]
-        assert_eq!(result_stdout, format!("{}\n", to));
+        assert_eq!(_result_stdout, format!("{}\n", to));
         // relax rules for windows test environment
         #[cfg(windows)]
-        assert!(result_stdout.ends_with(&format!("{}\n", to)));
+        assert!(_result_stdout.ends_with(&format!("{}\n", to)));
     }
 }
 
diff --git a/tests/by-util/test_uname.rs b/tests/by-util/test_uname.rs
index 6b8d2d59d..da901d985 100644
--- a/tests/by-util/test_uname.rs
+++ b/tests/by-util/test_uname.rs
@@ -36,7 +36,12 @@ fn test_uname_kernel_version() {
 fn test_uname_kernel() {
     let (_, mut ucmd) = at_and_ucmd!();
 
-    let result = ucmd.arg("-o").succeeds();
     #[cfg(target_os = "linux")]
-    assert!(result.stdout_str().to_lowercase().contains("linux"));
+    {
+        let result = ucmd.arg("-o").succeeds();
+        assert!(result.stdout_str().to_lowercase().contains("linux"));
+    }
+
+    #[cfg(not(target_os = "linux"))]
+    let result = ucmd.arg("-o").succeeds();
 }