diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 16ee5bb..5dab43e 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -3,7 +3,7 @@ name: Tests
 on:
   push:
     branches: [ master ]
-    tags: [ '*.*.*' ]
+    tags: [ '[0-9]+.[0-9]+.[0-9]+*' ]
   pull_request:
     branches: [ master ]
 
@@ -24,8 +24,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.7, 3.11]
-        os: [ubuntu-latest, windows-latest]
+        python-version: ['3.9', '3.13', '3.14-dev']
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    continue-on-error: ${{ matrix.python-version == '3.14-dev' }}
 
     steps:
     - uses: actions/checkout@v4
@@ -48,7 +49,7 @@ jobs:
 
     # FYI: Requires token to continue usage
     # - name: Upload to Codecov
-    #   if: matrix.os == 'ubuntu-latest' && matrix.python-version == 3.8
+    #   if: matrix.os == 'ubuntu-latest' && matrix.python-version == 3.9
     #   uses: codecov/codecov-action@v1
     #   with:
     #     name: pytests
@@ -64,7 +65,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.9
 
     - name: Installation (deps and package)
       run: |
@@ -86,7 +87,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.8
+        python-version: 3.9
     - name: install flit
       run: |
         pip install flit~=3.0
diff --git a/mdformat_myst/py.typed b/mdformat_myst/py.typed
new file mode 100644
index 0000000..7632ecf
--- /dev/null
+++ b/mdformat_myst/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561
diff --git a/pyproject.toml b/pyproject.toml
index 940fee1..4260c7f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,6 @@
 requires = ["flit_core >=2,<4"]
 build-backend = "flit_core.buildapi"
 
-
 [tool.flit.metadata]
 module = "mdformat_myst"
 author = "Taneli Hukkinen"
@@ -19,9 +18,9 @@ classifiers = [
 ]
 keywords = "mdformat,markdown,formatter,gfm"
 
-requires-python=">=3.7"
+requires-python=">=3.9"
 requires=[
-    "mdformat >=0.7.0,<0.8.0",
+    "mdformat >=0.7.0",
     "mdit-py-plugins >=0.3.0",
     "mdformat-tables >=0.4.0",
     "mdformat-frontmatter >=0.3.2",
diff --git a/tox.ini b/tox.ini
index ae526c6..3f8959b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,15 +1,15 @@
 [tox]
-envlist = py38
+envlist = py39
 isolated_build = True
 
-[testenv:py{37,38,39}]
+[testenv:py{39,311,313}]
 extras = test
 deps =
     black
     flake8
 commands = pytest {posargs}
 
-[testenv:py{37,38,39}-hook]
+[testenv:py{39,311,313}-hook]
 commands = pre-commit run --config .pre-commit-test.yaml {posargs:--all-files --verbose --show-diff-on-failure}
 
 [flake8]