diff --git a/Project.toml b/Project.toml
index 5416d45..1c2700d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "HorseML"
 uuid = "cd092912-fa1d-4500-ad73-daf1b0b0bfff"
 authors = ["Watasu Monma"]
-version = "0.3.5"
+version = "0.4.0"
 
 [deps]
 CSV = "336ed68f-0bac-5ca0-87d4-7b16caf5d00b"
diff --git a/RELEASE.md b/RELEASE.md
index c58403f..fe0fcc3 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,5 +1,9 @@
 # HorseML Release Note
 
+## v0.4.0
+- Added clustering models
+- Added loss functions for clustering models
+
 ## v0.3.5
 - Supported training on GPU
 - Added `databuilder` to automatically format data