diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 3f527ab..74c3c7b 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -14,23 +14,21 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-
       - uses: astral-sh/setup-uv@v5
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Install Dependencies
+      - name: Type Checking
         run: |
-          uv pip install . ruff mypy pytest readme_renderer
-          uv pip list
-      - name: Type Checker
+          uvx --with . mypy ptpython
+      - name: Code formatting
         run: |
-          mypy ptpython
-          ruff check .
-          ruff format --check .
-      - name: Run Tests
+          uvx ruff check .
+          uvx ruff format --check .
+      - name: Unit test
         run: |
-          pytest tests/
+          uvx --with . pytest tests/
       - name: Validate README.md
         # Ensure that the README renders correctly (required for uploading to PyPI).
         run: |
+          uv pip install readme_renderer
           python -m readme_renderer README.rst > /dev/null
diff --git a/ptpython/history_browser.py b/ptpython/history_browser.py
index ae0ac03..72bc576 100644
--- a/ptpython/history_browser.py
+++ b/ptpython/history_browser.py
@@ -58,13 +58,15 @@
 from .utils import if_mousedown
 
 if TYPE_CHECKING:
+    from typing_extensions import TypeAlias
+
     from .python_input import PythonInput
 
 HISTORY_COUNT = 2000
 
 __all__ = ["HistoryLayout", "PythonHistory"]
 
-E = KeyPressEvent
+E: TypeAlias = KeyPressEvent
 
 HELP_TEXT = """
 This interface is meant to select multiple lines from the
diff --git a/ptpython/key_bindings.py b/ptpython/key_bindings.py
index d7bb575..48c5f5a 100644
--- a/ptpython/key_bindings.py
+++ b/ptpython/key_bindings.py
@@ -22,6 +22,8 @@
 from .utils import document_is_multiline_python
 
 if TYPE_CHECKING:
+    from typing_extensions import TypeAlias
+
     from .python_input import PythonInput
 
 __all__ = [
@@ -30,7 +32,7 @@
     "load_confirm_exit_bindings",
 ]
 
-E = KeyPressEvent
+E: TypeAlias = KeyPressEvent
 
 
 @Condition