diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index 76da661..876cb1e 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -6,9 +6,25 @@ version = 4
 name = "aoc"
 version = "0.1.0"
 dependencies = [
+ "itertools",
  "nom",
 ]
 
+[[package]]
+name = "either"
+version = "1.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
+
+[[package]]
+name = "itertools"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b192c782037fadd9cfa75548310488aabdbf3d2da73885b31bd0abd03351285"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "memchr"
 version = "2.7.6"
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index b8165a4..017bf39 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -8,4 +8,5 @@ path = "main.rs"
 name = "aoc"
 
 [dependencies]
+itertools = "0.14"
 nom = "8.0.0"
diff --git a/rust/puzzles/day5.rs b/rust/puzzles/day5.rs
index 68e2b0a..61b7d0b 100644
--- a/rust/puzzles/day5.rs
+++ b/rust/puzzles/day5.rs
@@ -1,4 +1,5 @@
 use crate::puzzle::Puzzle;
+use itertools::Itertools;
 use nom::{
     Parser,
     character::complete::{char, newline, usize},
@@ -35,10 +36,8 @@ pub const PUZZLE: Puzzle<(Vec<Range>, Vec<usize>), 2> = Puzzle {
                 .to_string()
         },
         |(ranges, _)| {
-            let mut sorted_ranges = ranges.clone();
-            sorted_ranges.sort_by_key(|r| r.lower);
             let mut merged = Ranges::new();
-            for r in sorted_ranges {
+            for r in ranges.iter().cloned().sorted_by_key(|r| r.lower) {
                 merged.add(r);
             }
             merged.total_length().to_string()