diff --git a/pyproject.toml b/pyproject.toml
index 374b58c..c3cb8d5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,39 @@
 [build-system]
-requires = [
-    "setuptools>=42",
-    "wheel"
+build-backend = 'flit_core.buildapi'
+requires = ['flit_core >=3.4,<4']
+
+[project]
+name = "aiidalab-sssp"
+dynamic = ['version']   # read from aiidalab_sss_workflow/__init__.py
+authors = [{name = "Jusong Yu", email = "jusong.yu@psi.ch"}]
+maintainers = [{name = "Jusong Yu", email = "jusong.yu@psi.ch"}]
+description = "SSSP AiiDAlab app to run pseudopotential verificaiton and optimization"
+readme = "README.md"
+requires-python = ">=3.9"
+license = {file="LICENSE"}
+classifiers = [
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Framework :: AiiDA",
+    "Development Status :: 5 - Production/Stable",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
 ]
-build-backend = "setuptools.build_meta"
+dependencies = [
+    "aiida-sssp-workflow",
+    "solara"
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest~=7.0",
+]
+
+[project.urls]
+Documentation = "https://aiida-sssp-workflow.readthedocs.io/"
+Source = "https://github.com/aiidateam/aiida-sssp-workflow"
+
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 1dd7a39..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,66 +0,0 @@
-[metadata]
-name = aiidalab_sssp
-version = 23.3.0
-description = AiiDAlab app to run pseudopotential verification
-long_description = file: README.md
-long_description_content_type = text/markdown
-url = https://github.com/aiidalab/aiidalab-sssp
-author = Jusong Yu
-author_email = jusong.yu@psi.ch
-license = MIT
-license_file = LICENSE
-classifiers =
-    License :: OSI Approved :: MIT License
-    Operating System :: OS Independent
-    Programming Language :: Python :: 3
-    Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.8
-    Programming Language :: Python :: 3.9
-    Programming Language :: Python :: 3.10
-project_urls =
-    Logo = https://raw.githubusercontent.com/aiidalab/aiidalab-sssp/main/miscellaneous/logo-sssp.png
-    Bug Tracker = https://github.com/aiidalab/aiidalab-sssp/issues
-    Documentation = https://github.com/aiidalab/aiidalab-sssp#readme
-
-[options]
-packages = find:
-install_requires =
-    aiida-core~=2.2
-    aiida-sssp-workflow~=3.0.0
-    aiidalab-widgets-base~=2.0.0b5
-    widget-bandsplot~=0.5.1
-    widget-periodictable~=3.0
-python_requires = >=3.8
-
-[options.extras_require]
-dev =
-    bumpver==2021.1114
-    pre-commit==2.11.1
-
-[options.package_data]
-aiidalab_sssp.parameters = ssspapp.yaml
-
-[aiidalab]
-title = SSSP toolbox
-description = Perform pseudopotential calculations and verification
-
-[flake8]
-ignore =
-    E501  # Line length handled by black.
-    W503  # Line break before binary operator, preferred formatting for black.
-    E203  # Whitespace before ':', preferred formatting for black.
-
-[bumpver]
-current_version = "v23.03.0"
-version_pattern = "v0Y.0M.PATCH[PYTAGNUM]"
-commit_message = "Bump version {old_version} -> {new_version}"
-commit = True
-tag = True
-push = True
-
-[bumpver:file_patterns]
-aiidalab_sssp/version.py =
-    __version__ = "{version}"
-setup.cfg =
-    current_version = "{version}"
-    version = {pep440_version}
diff --git a/setup.py b/setup.py
deleted file mode 100644
index b908cbe..0000000
--- a/setup.py
+++ /dev/null
@@ -1,3 +0,0 @@
-import setuptools
-
-setuptools.setup()