diff --git a/CHANGELOG.md b/CHANGELOG.md
index 594f5de..715f8d4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+## v0.4.0 (2024-06-11)
+
+### Feat
+
+- improve sample efficiency (#28)
+- simplify installation (#26)
+- support pre-fitted estimators (#19)
+
 ## v0.3.1 (2024-04-19)
 
 ### Fix
diff --git a/pyproject.toml b/pyproject.toml
index 9eb30d9..9a7af6e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]  # https://python-poetry.org/docs/pyproject/
 name = "conformal-tights"
-version = "0.3.1"
+version = "0.4.0"
 description = "A Python package that adds conformal prediction of coherent quantiles and intervals to any scikit-learn regressor or Darts forecaster."
 authors = ["Laurent Sorber <laurent@radix.ai>"]
 readme = "README.md"