diff --git a/nginxfmt.py b/nginxfmt.py
index c59b36e..5bafe32 100755
--- a/nginxfmt.py
+++ b/nginxfmt.py
@@ -18,7 +18,7 @@
 
 __author__ = "Michał Słomkowski"
 __license__ = "Apache 2.0"
-__version__ = "1.2.0-SNAPSHOT"
+__version__ = "1.2.1"
 
 
 class FormatterOptions:
@@ -360,5 +360,9 @@ def _standalone_run(program_arguments):
             formatter.format_file(config_file_path, backup_file_path)
 
 
-if __name__ == "__main__":
+def main():
     _standalone_run(sys.argv[1:])
+
+
+if __name__ == "__main__":
+    main()
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..a693d58
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,26 @@
+[tool.poetry]
+name = "nginxfmt"
+version = "1.2.1"
+description = "nginx config file formatter with no additional dependencies."
+authors = ["Michał Słomkowski"]
+license = "Apache 2.0"
+readme = "README.md"
+homepage = "https://github.com/slomkowski/nginx-config-formatter"
+repository = "https://github.com/slomkowski/nginx-config-formatter"
+keywords = ["nginx", "formatter"]
+include = [
+    "LICENSE",
+]
+
+
+[tool.poetry.dependencies]
+python = ">=3.4"
+
+[tool.poetry.dev-dependencies]
+
+[tool.poetry.scripts]
+nginxfmt = "nginxfmt:main"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"