diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index edf06396..64d7ce55 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Change Log
 
+## 0.15.6
+
+- chore(deps): bump python-varname to 0.14
+- ci: update GitHub Actions to use ubuntu-24.04
+- style: fix style issues in test files
+
 ## 0.15.5
 
 - fix: fix `kwargs` not updated when pipeline is a `Pipen` object in `utils.load_pipeline()`
diff --git a/pipen/version.py b/pipen/version.py
index 77115ebf..71f6aead 100644
--- a/pipen/version.py
+++ b/pipen/version.py
@@ -1,3 +1,3 @@
 """Provide version of pipen"""
 
-__version__ = "0.15.5"
+__version__ = "0.15.6"
diff --git a/pyproject.toml b/pyproject.toml
index 38b17b64..543ea42c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.masonry.api"
 
 [tool.poetry]
 name = "pipen"
-version = "0.15.5"
+version = "0.15.6"
 description = "A pipeline framework for python"
 authors = [ "pwwang <pwwang@pwwang.com>",]
 license = "MIT"