diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 8281016..adec444 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -11,15 +11,10 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Python ${{ matrix.python-version }}
+    - name: Set up Python
       uses: actions/setup-python@v3
-      with:
-        python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
diff --git a/flatpaker/entry.py b/flatpaker/entry.py
index ddef2b6..f26732a 100644
--- a/flatpaker/entry.py
+++ b/flatpaker/entry.py
@@ -298,7 +298,7 @@ def _flat_manager_config(args: BaseBuildArguments) -> FlatManagerConfig | None:
     if args.flat_manager_token:
         token = args.flat_manager_token
     elif p := args.flat_manager_token_file:
-        with open(os.path.expanduser(os.path.expandvars(p)), 'r', encoding='utf-8') as f:
+        with open(os.path.expanduser(os.path.expandvars(p)), encoding='utf-8') as f:
             token = f.read().strip()
     else:
         # This is imported here becaue it's optional.
diff --git a/pyproject.toml b/pyproject.toml
index 97aa710..631d3b0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,10 +46,14 @@
   strict = true
   packages = "flatpaker"
   plugins = "pydantic.mypy"
+  python_version = "3.10"
 
 [tool.ruff]
   line-length = 100
 
+  [tool.ruff.lint]
+    extend-select = ["A", "ERA", "FURB", "I", "N", "UP"]
+
   [tool.ruff.format]
     quote-style = "preserve"