diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index b2773c95..08b4cc8e 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Change Log
 
+## 0.15.4
+
+- fix: fix Pipen object not recognized by `utils.load_pipeline()`
+- style: fix type annotations in Pipen class
+- deps: bump argx to 0.2.11
+
 ## 0.15.3
 
 - feat: add `pipen.run()` as a function to run a pipeline
diff --git a/pipen/version.py b/pipen/version.py
index 3053a0ab..836eb0bb 100644
--- a/pipen/version.py
+++ b/pipen/version.py
@@ -1,3 +1,3 @@
 """Provide version of pipen"""
 
-__version__ = "0.15.3"
+__version__ = "0.15.4"
diff --git a/pyproject.toml b/pyproject.toml
index 225f0d4b..4a76e063 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.masonry.api"
 
 [tool.poetry]
 name = "pipen"
-version = "0.15.3"
+version = "0.15.4"
 description = "A pipeline framework for python"
 authors = [ "pwwang <pwwang@pwwang.com>",]
 license = "MIT"