diff --git a/pyproject.toml b/pyproject.toml
index 7b8092a..fd357dc 100755
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "itkit"
-version = "4.0.0rc5"
+version = "4.0.0"
 requires-python = ">= 3.10"
 description = "ITKIT: Feasible Medical Image Operation based on SimpleITK API"
 readme = "README.md"