diff --git a/pyproject.toml b/pyproject.toml
index 2a5b8e0f..febaf23c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "capsula"
-version = "0.3.0"
+version = "0.4.0"
 description = "A Python package to capture command/function execution context for reproducibility."
 license = "MIT"
 authors = ["Shunichiro Nomura <nomura@space.t.u-tokyo.ac.jp>"]