diff --git a/CHANGELOG.md b/CHANGELOG.md
index f1a90ca..2833a4b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## v1.6.0 (2023-01-12)
+
+### Feat
+
+- **parser**: Check if substitutions are provided or not
+
 ## v1.5.0 (2022-12-28)
 
 ### Feat
diff --git a/README.rst b/README.rst
index 2ff3b77..5333427 100644
--- a/README.rst
+++ b/README.rst
@@ -58,7 +58,7 @@ License <https://github.com/junghoon-vans/varst/blob/main/LICENSE>`__
    :target: https://github.com/marketplace/actions/rst-substitution
 .. |pre-commit.ci status| image:: https://results.pre-commit.ci/badge/github/junghoon-vans/varst/main.svg
    :target: https://results.pre-commit.ci/latest/github/junghoon-vans/varst/main
-.. |GitHub Workflow Status| image:: https://img.shields.io/github/actions/workflow/status/junghoon-vans/varst/python-publish.yml?branch=v1.5.0
+.. |GitHub Workflow Status| image:: https://img.shields.io/github/actions/workflow/status/junghoon-vans/varst/python-publish.yml?branch=v1.6.0
 .. |Documentation Status| image:: https://readthedocs.org/projects/varst/badge/?version=latest
     :target: https://varst.readthedocs.io/en/latest/?badge=latest
 
diff --git a/pyproject.toml b/pyproject.toml
index 8765ddd..0b4564a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "varst"
-version = "1.5.0"
+version = "1.6.0"
 description = "Replace substitutions in rst files with variables."
 authors = ["junghoon-vans <junghoon.ban@gmail.com>"]
 maintainers = ["junghoon-vans <junghoon.ban@gmail.com>"]
@@ -50,7 +50,7 @@ requires = [
 [tool]
 [tool.commitizen]
 name = "cz_conventional_commits"
-version = "1.5.0"
+version = "1.6.0"
 tag_format = "v$version"
 version_files = [
     "varst/__init__.py",
diff --git a/varst/__init__.py b/varst/__init__.py
index b278419..2078a44 100644
--- a/varst/__init__.py
+++ b/varst/__init__.py
@@ -1,2 +1,2 @@
-__version__ = '1.5.0'
+__version__ = '1.6.0'
 supported = ('rst', 'restructuredtext', 'rest', 'restx', 'rtxt', 'rstx')