diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..cdfe1c6
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,3 @@
+#check https://setuptools.pypa.io/en/latest/userguide/miscellaneous.html#controlling-files-in-the-distribution
+#to include headers
+graft pyyjson/*.h
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index f38b2aa..1e70784 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pyyjson"
-version = "0.1.3"
+version = "0.2.0"
 authors = [
     {name = "Hyunsung Lee", email = "ita9naiwa@gmail.com"}
 ]