diff --git a/.github/workflows/lint-and-test.yml b/.github/workflows/lint-and-test.yml
index 5d9966b..30fe6c9 100644
--- a/.github/workflows/lint-and-test.yml
+++ b/.github/workflows/lint-and-test.yml
@@ -48,17 +48,10 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          pip install --group dev .
           pip install -q Django~=${{ matrix.django_version }}
-          pip install coverage pytest
-          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
 
       - name: Run tests
         run: |
-          coverage3 run --source='./encrypted_fields' manage.py test
+          coverage run --source='./src/encrypted_fields' manage.py test
           coverage xml
-
-#    - name: "Upload coverage to Artifact"
-#      uses: actions/upload-artifact@v4
-#      with:
-#        name: coverage
-#        path: coverage.xml
diff --git a/.gitignore b/.gitignore
index f0f01b9..a04484b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@ dist/
 .ruff_cache
 .venv
 .venv_django_*
+.coverage*
+coverage.*
diff --git a/pyproject.toml b/pyproject.toml
index 8a2f802..c99195c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,35 @@
+[project]
+name = "django-fernet-encrypted-fields"
+version = "0.3.1"
+description = "Symmetrically encrypted model fields for Django"
+readme = "README.md"
+license = "MIT"
+authors = [
+    { name = "jazzband", email = "n.anahara@fragment.co.jp" },
+]
+requires-python = ">=3.10"
+dependencies = [
+    "Django>=4.2",
+    "cryptography>=35.0.0",
+]
+
+[project.urls]
+Homepage = "https://github.com/jazzband/django-fernet-encrypted-fields/"
+
+[build-system]
+requires = ["setuptools>=61.0.0"]
+build-backend = "setuptools.build_meta"
+
+[dependency-groups]
+dev = [
+    "mypy>=1.19.1,<2",
+    "pre-commit>=4.5.1",
+    "ruff>=0.15.6,<0.16.0",
+    "pytest>=9.0.2",
+    "pytest-cov>=7.0.0",
+    "coverage>=7.13.4,<8.0.0",
+]
+
 ##################
 # ruff
 ##################
@@ -7,7 +39,7 @@ lint.fixable = ["ALL"]
 lint.ignore = ["A003", "COM812", "D", "DJ008", "ERA001", "ISC001", "PLC2401", "PLC2403", "PT011", "RUF001", "S101", "S105", "S608", "SIM103", "TC001", "TC002", "TC003", "UP040"]
 lint.select = ["ALL"]
 lint.unfixable = ["ERA001", "F401"]
-include = ["encrypted_fields/*.py", "package_test/*.py"]
+extend-include = ["package_test/**/*.py"]
 target-version = "py312"
 
 ##################
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index df636f6..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-cffi==2.0.0
-cryptography==46.0.2
-pycparser==2.23
-Django>=4.2
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 5b7c6fc..0000000
--- a/setup.py
+++ /dev/null
@@ -1,18 +0,0 @@
-from setuptools import setup
-
-setup(
-    name="django-fernet-encrypted-fields",
-    description=("This is inspired by django-encrypted-fields."),
-    long_description=open("README.md").read(),
-    long_description_content_type="text/markdown",
-    url="http://github.com/jazzband/django-fernet-encrypted-fields/",
-    license="MIT",
-    author="jazzband",
-    author_email="n.anahara@fragment.co.jp",
-    packages=["encrypted_fields"],
-    version="0.3.0",
-    install_requires=[
-        "Django>=4.2",
-        "cryptography>=35.0.0",
-    ],
-)
diff --git a/encrypted_fields/__init__.py b/src/encrypted_fields/__init__.py
similarity index 100%
rename from encrypted_fields/__init__.py
rename to src/encrypted_fields/__init__.py
diff --git a/encrypted_fields/fields.py b/src/encrypted_fields/fields.py
similarity index 100%
rename from encrypted_fields/fields.py
rename to src/encrypted_fields/fields.py