diff --git a/CHANGELOG.md b/CHANGELOG.md
index e1050a2..5e77d59 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 <!--next-version-placeholder-->
 
+## v0.4.0 (2023-11-04)
+
+### Feature
+
+* Fix `recursive_strict` behavior for `apply_custom_loss` and `patch`, set default `var_type` to `"std"`, add more parameters to `VarianceEstimator` ([#105](https://github.com/34j/boost-loss/issues/105)) ([`24e90ac`](https://github.com/34j/boost-loss/commit/24e90ac96758ceebf665f2c74fd1e1d839d42534))
+
 ## v0.3.6 (2023-10-24)
 
 ### Fix
diff --git a/pyproject.toml b/pyproject.toml
index 60130a8..2ac34be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "boost-loss"
-version = "0.3.6"
+version = "0.4.0"
 description = "Utilities for easy use of custom losses in CatBoost, LightGBM, XGBoost"
 authors = ["34j <34j.95a2p@simplelogin.com>"]
 license = "MIT"
diff --git a/src/boost_loss/__init__.py b/src/boost_loss/__init__.py
index 841e233..c8e574e 100644
--- a/src/boost_loss/__init__.py
+++ b/src/boost_loss/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.3.6"
+__version__ = "0.4.0"
 from .base import LossBase
 from .debug import DebugLoss, PrintLoss
 from .resuming import ResumingLoss