diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 709a535..9643a4e 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -15,7 +15,7 @@ jobs:
     steps:
     - uses: actions/checkout@v7
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: '3.10'
     - uses: pre-commit/action@v3.0.1
@@ -31,7 +31,7 @@ jobs:
     - uses: actions/checkout@v7
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -39,7 +39,7 @@ jobs:
       # we install with flit --pth-file,
       # so that coverage will be recorded for the module
       run: |
-        pip install flit>=3.12.0
+        pip install flit>=4.0.2
         flit install --deps=production --extras=test --pth-file
 
     - name: Run pytest
@@ -61,7 +61,7 @@ jobs:
     steps:
     - uses: actions/checkout@v7
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: '3.10'
 
@@ -80,7 +80,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: "3.x"
       - name: Install build tooling
diff --git a/pyproject.toml b/pyproject.toml
index 1e371c7..4ce065b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["flit_core >=2,<4"]
+requires = ["flit_core >=4.0.2,<5"]
 build-backend = "flit_core.buildapi"
 
-[tool.flit.metadata]
-module = "mdformat_footnote"
-author = "Gaige B. Paulsen"
-author-email = "gaige@cluetrust.com"
-description-file = "README.md"
-home-page = "https://github.com/gaige/mdformat-footnote"
+[project]
+name = "mdformat_footnote"
+authors = [
+    {name = "Gaige B. Paulsen", email = "gaige@cluetrust.com"},
+]
+dynamic = ["version", "description"]
+readme = "README.md"
+requires-python = ">=3.10"
 classifiers = [
     "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",
@@ -16,21 +18,23 @@ classifiers = [
     "Programming Language :: Python :: 3",
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
-keywords = "mdformat,markdown,markdown-it"
+keywords = ["mdformat", "markdown", "markdown-it"]
+dependencies = [
+    "mdformat >=0.7.0",
+    "mdit-py-plugins >=0.4.0",
+]
 
-requires-python=">=3.10"
-requires=["mdformat >=0.7.0",
-          "mdit-py-plugins >=0.4.0",
-            ]
+[project.urls]
+Home = "https://github.com/gaige/mdformat-footnote"
 
-[tool.flit.metadata.requires-extra]
+[project.optional-dependencies]
 test = [
     "pytest>=8.0.0",
     "pytest-cov>=7.0.0",
 ]
 dev = ["pre-commit"]
 
-[tool.flit.entrypoints."mdformat.parser_extension"]
+[project.entry-points."mdformat.parser_extension"]
 footnote = "mdformat_footnote"
 
 [tool.flit.sdist]
diff --git a/requirements.txt b/requirements.txt
index 028c1ac..9946531 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-flit>=3.12.0
-tox>=4.56.1
+flit>=4.0.2
+tox>=4.61.1
 pytest>=9.1.1
 mdformat >=0.7.0
 mdit_py_plugins >=0.4.0