diff --git a/Cargo.lock b/Cargo.lock
index b3305769..0f2c87f6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2312,7 +2312,7 @@ dependencies = [
 
 [[package]]
 name = "jwst-codec-utils"
-version = "0.1.0"
+version = "0.0.1"
 dependencies = [
  "arbitrary",
  "clap",
diff --git a/libs/jwst-codec-utils/Cargo.toml b/libs/jwst-codec-utils/Cargo.toml
index 6f0bdbaf..f9936f2c 100644
--- a/libs/jwst-codec-utils/Cargo.toml
+++ b/libs/jwst-codec-utils/Cargo.toml
@@ -1,7 +1,8 @@
 [package]
-name = "jwst-codec-utils"
-version = "0.1.0"
+authors = ["x1a0t <405028157@qq.com>", "DarkSky <darksky2048@gmail.com>"]
 edition = "2021"
+name = "jwst-codec-utils"
+version = "0.0.1"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -16,7 +17,7 @@ arbitrary = { version = "1.3", features = ["derive"], optional = true }
 clap = { version = "4.4", features = ["derive"], optional = true }
 phf = { version = "0.11", features = ["macros"], optional = true }
 rand_chacha = "0.3"
-regex = { version = "1.9", optional = true }
+regex = { version = "1.10", optional = true }
 
 # ======= bench dependencies =======
 lib0 = { version = "=0.16.5", features = ["lib0-serde"] }
@@ -38,6 +39,10 @@ proptest-derive = "0.4"
 name = "bench_result_render"
 path = "bin/bench_result_render.rs"
 
+[[bin]]
+name = "doc_merger"
+path = "bin/doc_merger.rs"
+
 [[bin]]
 name = "memory_leak_test"
 path = "bin/memory_leak_test.rs"
@@ -60,11 +65,11 @@ name = "text_ops_benchmarks"
 
 [[bench]]
 harness = false
-name = "update_benchmarks"
+name = "apply_benchmarks"
 
 [[bench]]
 harness = false
-name = "apply_benchmarks"
+name = "update_benchmarks"
 
 [lib]
 bench = true
diff --git a/libs/jwst-codec-utils/fuzz/Cargo.toml b/libs/jwst-codec-utils/fuzz/Cargo.toml
index 57980980..c96a18ee 100644
--- a/libs/jwst-codec-utils/fuzz/Cargo.toml
+++ b/libs/jwst-codec-utils/fuzz/Cargo.toml
@@ -1,16 +1,16 @@
 [package]
+edition = "2021"
 name = "jwst-codec-fuzz"
-version = "0.0.0"
 publish = false
-edition = "2021"
+version = "0.0.0"
 
 [package.metadata]
 cargo-fuzz = true
 
 [dependencies]
-rand = "0.8.5"
-rand_chacha = "0.3.1"
-libfuzzer-sys = "0.4.6"
+rand = "0.8"
+rand_chacha = "0.3"
+libfuzzer-sys = "0.4"
 
 jwst-codec-utils = { path = "..", features = ["fuzz"] }
 lib0 = "0.16.5"
@@ -27,65 +27,65 @@ members = ["."]
 debug = 1
 
 [[bin]]
+doc = false
 name = "codec_doc_any_struct"
 path = "fuzz_targets/codec_doc_any_struct.rs"
 test = false
-doc = false
 
 [[bin]]
+doc = false
 name = "codec_doc_any"
 path = "fuzz_targets/codec_doc_any.rs"
 test = false
-doc = false
 
 [[bin]]
+doc = false
 name = "decode_bytes"
 path = "fuzz_targets/decode_bytes.rs"
 test = false
-doc = false
 
 [[bin]]
+doc = false
 name = "ins_del_text"
 path = "fuzz_targets/ins_del_text.rs"
 test = false
-doc = false
 
 [[bin]]
+doc = false
 name = "sync_message"
 path = "fuzz_targets/sync_message.rs"
 test = false
-doc = false
 
 [[bin]]
+doc = false
 name = "i32_decode"
 path = "fuzz_targets/i32_decode.rs"
 test = false
-doc = false
 
 [[bin]]
+doc = false
 name = "i32_encode"
 path = "fuzz_targets/i32_encode.rs"
 test = false
-doc = false
 
 [[bin]]
+doc = false
 name = "u64_decode"
 path = "fuzz_targets/u64_decode.rs"
 test = false
-doc = false
 
 
 [[bin]]
+doc = false
 name = "u64_encode"
 path = "fuzz_targets/u64_encode.rs"
 test = false
-doc = false
 
 [[bin]]
+doc = false
 name = "apply_update"
 path = "fuzz_targets/apply_update.rs"
 test = false
-doc = false
 
 [patch.crates-io]
 lib0 = { git = "https://github.com/toeverything/y-crdt", rev = "a700f09" }
diff --git a/libs/jwst-codec-utils/src/doc_operation/yrs_op/mod.rs b/libs/jwst-codec-utils/src/doc_operation/yrs_op/mod.rs
index dbb0c861..15b50393 100644
--- a/libs/jwst-codec-utils/src/doc_operation/yrs_op/mod.rs
+++ b/libs/jwst-codec-utils/src/doc_operation/yrs_op/mod.rs
@@ -161,7 +161,7 @@ mod tests {
     fn test_ops_registry_get_ops() {
         let ops_registry = OpsRegistry::new();
         let ops = ops_registry.get_ops(&CRDTNestType::Array);
-        assert!(ops.len() > 0);
+        assert!(!ops.is_empty());
     }
 
     #[test]
@@ -170,6 +170,6 @@ mod tests {
         let array = doc.get_or_insert_array("array");
         let ops_registry = OpsRegistry::new();
         let ops = ops_registry.get_ops_from_yrs_nest_type(&YrsNestType::ArrayType(array));
-        assert!(ops.len() > 0);
+        assert!(!ops.is_empty());
     }
 }
diff --git a/libs/jwst-codec/src/codec/buffer.rs b/libs/jwst-codec/src/codec/buffer.rs
index ee296073..72d99f9e 100644
--- a/libs/jwst-codec/src/codec/buffer.rs
+++ b/libs/jwst-codec/src/codec/buffer.rs
@@ -73,6 +73,6 @@ mod tests {
         let mut buf = Vec::<u8>::new();
         write_var_buffer(&mut buf, data).unwrap();
         let result = read_var_buffer(buf.as_bytes());
-        assert_eq!(result, Ok((&[][..], &data[..])));
+        assert_eq!(result, Ok((&[][..], data)));
     }
 }
diff --git a/libs/jwst-codec/src/doc/awareness.rs b/libs/jwst-codec/src/doc/awareness.rs
index a4f8680f..b7f838f1 100644
--- a/libs/jwst-codec/src/doc/awareness.rs
+++ b/libs/jwst-codec/src/doc/awareness.rs
@@ -3,11 +3,11 @@ use std::{cmp::max, collections::hash_map::Entry};
 use super::*;
 use crate::sync::Arc;
 
-type AwarenessCallback = dyn Fn(&Awareness, AwarenessEvent) + Send + Sync + 'static;
+pub type AwarenessCallback = Arc<dyn Fn(&Awareness, AwarenessEvent) + Send + Sync + 'static>;
 
 pub struct Awareness {
     awareness: AwarenessStates,
-    callback: Option<Arc<AwarenessCallback>>,
+    callback: Option<AwarenessCallback>,
     local_id: u64,
 }