diff --git a/Cargo.toml b/Cargo.toml
index 28728773..2b1c3682 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ include = ["/src/**/*.rs", "/*.toml", "/LICENSE", "/README.md"]
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 dyn-clone = "1"
-hashbrown = "0.12"
+rustc-hash = "1"
 once_cell = "1"
 parking_lot = "0.12"
 dashmap = "5"
diff --git a/src/cached_source.rs b/src/cached_source.rs
index 3b2cdaac..321c4774 100644
--- a/src/cached_source.rs
+++ b/src/cached_source.rs
@@ -1,8 +1,12 @@
-use std::{borrow::Cow, hash::Hash, sync::Arc};
+use std::{
+  borrow::Cow,
+  hash::{BuildHasherDefault, Hash},
+  sync::Arc,
+};
 
 use dashmap::DashMap;
-use hashbrown::hash_map::DefaultHashBuilder;
 use once_cell::sync::OnceCell;
+use rustc_hash::FxHasher;
 
 use crate::{helpers::StreamChunks, MapOptions, Source, SourceMap};
 
@@ -44,7 +48,8 @@ pub struct CachedSource<T> {
   inner: Arc<T>,
   cached_buffer: OnceCell<Vec<u8>>,
   cached_source: OnceCell<Arc<str>>,
-  cached_maps: DashMap<MapOptions, Option<SourceMap>, DefaultHashBuilder>,
+  cached_maps:
+    DashMap<MapOptions, Option<SourceMap>, BuildHasherDefault<FxHasher>>,
 }
 
 impl<T> CachedSource<T> {
diff --git a/src/concat_source.rs b/src/concat_source.rs
index fce4b885..930f0372 100644
--- a/src/concat_source.rs
+++ b/src/concat_source.rs
@@ -4,7 +4,7 @@ use std::{
   hash::{Hash, Hasher},
 };
 
-use hashbrown::HashMap;
+use rustc_hash::FxHashMap as HashMap;
 
 use crate::{
   helpers::{get_map, GeneratedInfo, OnChunk, OnName, OnSource, StreamChunks},
@@ -138,14 +138,14 @@ impl StreamChunks for ConcatSource {
     }
     let mut current_line_offset = 0;
     let mut current_column_offset = 0;
-    let mut source_mapping: HashMap<String, u32> = HashMap::new();
-    let mut name_mapping: HashMap<String, u32> = HashMap::new();
+    let mut source_mapping: HashMap<String, u32> = HashMap::default();
+    let mut name_mapping: HashMap<String, u32> = HashMap::default();
     let mut need_to_cloas_mapping = false;
     for item in &self.children {
       let source_index_mapping: RefCell<HashMap<u32, u32>> =
-        RefCell::new(HashMap::new());
+        RefCell::new(HashMap::default());
       let name_index_mapping: RefCell<HashMap<u32, u32>> =
-        RefCell::new(HashMap::new());
+        RefCell::new(HashMap::default());
       let mut last_mapping_line = 0;
       let GeneratedInfo {
         generated_line,
diff --git a/src/helpers.rs b/src/helpers.rs
index 965b046b..51dbd111 100644
--- a/src/helpers.rs
+++ b/src/helpers.rs
@@ -1,6 +1,6 @@
 use std::{borrow::BorrowMut, cell::RefCell, sync::Arc};
 
-use hashbrown::HashMap;
+use rustc_hash::FxHashMap as HashMap;
 use substring::Substring;
 
 use crate::{
@@ -899,29 +899,29 @@ pub fn stream_chunks_of_combined_source_map(
   let inner_source: RefCell<Option<ArcStr>> =
     RefCell::new(inner_source.map(Into::into));
   let source_mapping: RefCell<HashMap<ArcStr, u32>> =
-    RefCell::new(HashMap::new());
-  let mut name_mapping: HashMap<ArcStr, u32> = HashMap::new();
+    RefCell::new(HashMap::default());
+  let mut name_mapping: HashMap<ArcStr, u32> = HashMap::default();
   let source_index_mapping: RefCell<HashMap<i64, i64>> =
-    RefCell::new(HashMap::new());
+    RefCell::new(HashMap::default());
   let name_index_mapping: RefCell<HashMap<i64, i64>> =
-    RefCell::new(HashMap::new());
+    RefCell::new(HashMap::default());
   let name_index_value_mapping: RefCell<HashMap<i64, ArcStr>> =
-    RefCell::new(HashMap::new());
+    RefCell::new(HashMap::default());
   let inner_source_index: RefCell<i64> = RefCell::new(-2);
   let inner_source_index_mapping: RefCell<HashMap<i64, i64>> =
-    RefCell::new(HashMap::new());
+    RefCell::new(HashMap::default());
   let inner_source_index_value_mapping: RefCell<
     HashMap<i64, (ArcStr, Option<ArcStr>)>,
-  > = RefCell::new(HashMap::new());
+  > = RefCell::new(HashMap::default());
   let inner_source_contents: RefCell<HashMap<i64, Option<ArcStr>>> =
-    RefCell::new(HashMap::new());
+    RefCell::new(HashMap::default());
   let inner_source_content_lines: RefCell<
     HashMap<i64, Option<Arc<Vec<ArcStr>>>>,
-  > = RefCell::new(HashMap::new());
+  > = RefCell::new(HashMap::default());
   let inner_name_index_mapping: RefCell<HashMap<i64, i64>> =
-    RefCell::new(HashMap::new());
+    RefCell::new(HashMap::default());
   let inner_name_index_value_mapping: RefCell<HashMap<i64, ArcStr>> =
-    RefCell::new(HashMap::new());
+    RefCell::new(HashMap::default());
   let inner_source_map_line_data: RefCell<Vec<SourceMapLineData>> =
     RefCell::new(Vec::new());
   let find_inner_mapping = |line: i64, column: i64| -> Option<u32> {
diff --git a/src/replace_source.rs b/src/replace_source.rs
index fb53d745..633f951e 100644
--- a/src/replace_source.rs
+++ b/src/replace_source.rs
@@ -5,8 +5,8 @@ use std::{
   sync::Arc,
 };
 
-use hashbrown::HashMap;
 use parking_lot::Mutex;
+use rustc_hash::FxHashMap as HashMap;
 use substring::Substring;
 
 use crate::{
@@ -169,9 +169,9 @@ impl<T: Source> StreamChunks for ReplaceSource<T> {
     let source_content_lines: RefCell<Vec<Option<Vec<String>>>> =
       RefCell::new(Vec::new());
     let name_mapping: RefCell<HashMap<String, u32>> =
-      RefCell::new(HashMap::new());
+      RefCell::new(HashMap::default());
     let name_index_mapping: RefCell<HashMap<u32, u32>> =
-      RefCell::new(HashMap::new());
+      RefCell::new(HashMap::default());
 
     // check if source_content[line][col] is equal to expect
     // Why this is needed?