diff --git a/pyproject.toml b/pyproject.toml
index 3b6813f..c70af73 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "colt"
-version = "0.12.0"
+version = "0.13.0"
 description = "A configuration utility for Python object."
 authors = ["altescy <altescy@fastmail.com>"]
 license = "MIT License"
diff --git a/tests/test_version.py b/tests/test_version.py
index fd3392a..986bef8 100644
--- a/tests/test_version.py
+++ b/tests/test_version.py
@@ -2,4 +2,4 @@
 
 
 def test_version() -> None:
-    assert colt.__version__ == "0.12.0"
+    assert colt.__version__ == "0.13.0"