diff --git a/Cargo.toml b/Cargo.toml
index 634ea80..ac9b3b1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,8 +19,8 @@ include = [
 ]
 
 [dependencies]
-hashbrown = "0.12.0"
-once_cell = "1.10.0"
+hashbrown = "0.14.2"
+once_cell = "1.18.0"
 enum-map = { version = "2", optional = true }
 serde = { version = "1", optional = true, features = ["derive"] }
 arbitrary = { version = "1", optional = true, features = ["derive"] }
diff --git a/src/trigrams/utils.rs b/src/trigrams/utils.rs
index 2fefec2..7cf22ac 100644
--- a/src/trigrams/utils.rs
+++ b/src/trigrams/utils.rs
@@ -143,7 +143,7 @@ mod tests {
             trigram_occurances,
         } = count(&lowercase_text);
         for &(trigram_str, expected_n) in pairs.iter() {
-            let chars: Vec<char> = trigram_str.clone().chars().collect();
+            let chars: Vec<char> = trigram_str.chars().collect();
             let trigram = Trigram(chars[0], chars[1], chars[2]);
             let actual_n = trigram_occurances[&trigram];
             assert_eq!(