diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 55d868a..558203a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,15 +10,25 @@ jobs:
   build:
     name: continuous-integration
     runs-on: ubuntu-latest
-
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.12']
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Overwrite .python-version
+      run: echo ${{ matrix.python-version }} > .python-version
+
     - name: Set up uv
       run: pip install uv
 
     - name: Check code quality with Ruff
-      run: uv run ruff check .
+      run: |
+        uv run ruff check
+        uv run ruff format --check
 
     - name: Check type hints with pyright
       run: uv run pyright
diff --git a/.python-version b/.python-version
index 8531a3b..e4fba21 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.12.2
+3.12
diff --git a/README.md b/README.md
index 9c6d3cc..478ddf5 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ We're [on pypi](https://pypi.org/project/dummio/), so `pip install dummio`.
 git clone git@github.com:zkurtz/dummio.git
 cd dummio
 pip install uv
-uv sync --group extras
+uv sync
 source .venv/bin/activate
+pre-commit install
 ```
diff --git a/dummio/constants.py b/dummio/constants.py
index bae5e3f..1323831 100644
--- a/dummio/constants.py
+++ b/dummio/constants.py
@@ -1,10 +1,10 @@
 """Constants for dummio."""
 
 from pathlib import Path
-from typing import Any
+from typing import Any, TypeAlias
 
-type PathType = str | Path
-type AnyDict = dict[Any, Any]
+PathType: TypeAlias = str | Path
+AnyDict: TypeAlias = dict[Any, Any]
 
 DEFAULT_ENCODING = "utf-8"
 DEFAULT_WRITE_MODE = "w"
diff --git a/pyproject.toml b/pyproject.toml
index 03df230..ce20395 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "dummio"
-version = "0.0.3"
+version = "0.1.0"
 description = "Easiest-possible IO for basic file types."
 authors = [{ name = "Zach Kurtz", email = "zkurtz@gmail.com" }]
 readme = "README.md"