diff --git a/pyproject.toml b/pyproject.toml
index 62567e2..445bd84 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "Py-Boost"
-version = "0.5.2"
+version = "0.6.0.dev1"
 description = "Python based GBDT"
 
 authors = [
@@ -48,4 +48,4 @@ tqdm = ">=4.64.1"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
-build-backend = "poetry.core.masonry.api"
\ No newline at end of file
+build-backend = "poetry.core.masonry.api"