diff --git a/.flake8 b/.flake8
index 1b819ca..75fe339 100644
--- a/.flake8
+++ b/.flake8
@@ -1,4 +1,5 @@
 [flake8]
+max-line-length = 120
 exclude =
     .git,
     .github,
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 3c7e13d..c709960 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.11", "3.12" ]
+        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
diff --git a/README.md b/README.md
index 6aa1848..aa0eb96 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 [![PyPI version](https://badge.fury.io/py/pytest-sqlalchemy-mock.svg)](https://badge.fury.io/py/pytest-sqlalchemy-mock)
 [![codecov](https://codecov.io/gh/resulyrt93/pytest-sqlalchemy-mock/branch/dev/graph/badge.svg?token=RUQ4DN3CH9)](https://codecov.io/gh/resulyrt93/pytest-sqlalchemy-mock)
 [![CI](https://github.com/resulyrt93/pytest-sqlalchemy-mock/actions/workflows/tests.yaml/badge.svg?branch=dev)](https://github.com/resulyrt93/pytest-sqlalchemy-mock/actions/workflows/tests.yaml)
+[![Supported Python Version](https://img.shields.io/pypi/pyversions/pytest-sqlalchemy-mock)](https://github.com/resulyrt93/pytest-sqlalchemy-mock)
 <a href="https://github.com/psf/black"><img alt="Code style: black" src="https://img.shields.io/badge/code%20style-black-000000.svg"></a>
 
 This plugin provides pytest fixtures to create an in-memory DB instance on tests and dump your raw test data.
diff --git a/pyproject.toml b/pyproject.toml
index a388bed..1e51c10 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ description = "pytest sqlalchemy plugin for mock"
 authors = [
     { name="Resul Yurttakalan", email="resulyrt93@gmail.com" },
 ]
-requires-python = ">=3.12"
+requires-python = ">=3.9"
 readme = "README.md"
 classifiers = [
     "Framework :: Pytest",
@@ -18,6 +18,8 @@ classifiers = [
     "Topic :: Software Development :: Testing",
     "Intended Audience :: Developers",
     "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "License :: OSI Approved :: MIT License",