diff --git a/2024/Cargo.toml b/2024/Cargo.toml
index 4da11e5..653cb7a 100644
--- a/2024/Cargo.toml
+++ b/2024/Cargo.toml
@@ -8,3 +8,4 @@ pathfinding = "4.11.0"
 rayon = "1.10.0"
 regex = "1.10.2"
 indexmap = { version = "2.7.0", features = ["rayon"] }
+hashbrown = { version = "0.15.2", features = ["rayon", "nightly"] }
diff --git a/2024/day11/Cargo.toml b/2024/day11/Cargo.toml
index 2b49c0b..5d4e085 100644
--- a/2024/day11/Cargo.toml
+++ b/2024/day11/Cargo.toml
@@ -12,3 +12,4 @@ itertools = { workspace = true }
 pathfinding = { workspace = true }
 rayon = { workspace = true }
 indexmap = { workspace = true }
+hashbrown = { workspace = true }
diff --git a/2024/day11/src/main.rs b/2024/day11/src/main.rs
index 8038e4d..7977ade 100644
--- a/2024/day11/src/main.rs
+++ b/2024/day11/src/main.rs
@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use hashbrown::HashMap;
 
 fn part(input: &str, count: u64) -> u64 {
     let mut stones = input