diff --git a/README.md b/README.md
index 025fb3d..392b326 100644
--- a/README.md
+++ b/README.md
@@ -68,6 +68,7 @@ pip install ./symusic
 * [minimidi](https://github.com/lzqlzzq/minimidi/tree/main) : A fast and lightweight midi parsing library written in cpp, which is the foundation of this project.
 * [pybind11](https://github.com/pybind/pybind11) : A great header-only library to help you create python binding for your cpp code.
 * [pybind11-stubgen](https://github.com/sizmailov/pybind11-stubgen) A nice tool to generate stub files for pybind11 projects.
+* [zpp_bits](https://github.com/eyalz800/zpp_bits) : An extraordinary fast and lightweight single header library for serialization and deserialization. I use it to support pickle.
 * [geek_time_cpp](https://github.com/adah1972/geek_time_cpp/tree/master) The example code of the book "Modern C++ Programming Practice". We use the [metamacro.h](https://github.com/adah1972/geek_time_cpp/blob/master/40/metamacro.h#L1-L622) in it for shortening the code.
 
   
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 6b53047..9b5cfc4 100644
--- a/setup.py
+++ b/setup.py
@@ -130,7 +130,7 @@ def build_extension(self, ext: CMakeExtension) -> None:
 # logic and declaration, and simpler if you include description/version in a file.
 setup(
     name="symusic",
-    version="0.1.4",
+    version="0.1.5",
     author="Yikai Liao",
     author_email="lyk-boya@outlook.com",
     description="A high performance MIDI file parser with comprehensible interface.",
diff --git a/symusic/__init__.py b/symusic/__init__.py
index 639d1e2..9ddf028 100644
--- a/symusic/__init__.py
+++ b/symusic/__init__.py
@@ -1,6 +1,6 @@
 from .factory import *
 
-__version__ = '0.1.4'
+__version__ = '0.1.5'
 
 __all__ = [