diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fff50306..af8eddea 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -72,7 +72,7 @@ jobs:
     - name: Set up Python packages
       run: |
         python -m pip install -U pip setuptools
-        python -m pip install -U wheel tox virtualenv -r requirements.txt
+        python -m pip install -U wheel tox virtualenv pytest -r requirements.txt
 
     - name: Set up Lua ${{ matrix.lua-version }}
       if: contains(matrix.os, 'ubuntu') && matrix.lua-version != 'bundle'
@@ -94,7 +94,7 @@ jobs:
     - name: Run tests
       run: |
         bash -c "python -m pip install dist/lupa-*.whl"
-        python -m lupa.tests.__main__
+        pytest lupa
       continue-on-error: ${{ contains(matrix.python-version, 'pypy') }}
 
     - name: Upload wheels
diff --git a/appveyor.yml b/appveyor.yml
index ae400193..629d5992 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -37,6 +37,7 @@ install:
   - SET PATH=C:\\Python%PYTHON%;c:\\Python%PYTHON%\\scripts;%PATH%
   - python -m pip.__main__ install -U pip wheel "setuptools!=72.0.0"
   - pip install -r requirements.txt
+  - pip install pytest
   - git submodule update --init --recursive
 
 build: off
@@ -48,7 +49,7 @@ build_script:
 
 test: off
 test_script:
-  - python -u -m lupa.tests.__main__
+  - pytest lupa
 
 artifacts:
   - path: dist/*.whl
diff --git a/tox.ini b/tox.ini
index 5c6044fa..a9389f18 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,9 +13,10 @@ envlist=
 deps=
     Cython
     setuptools
+    pytest
 passenv=
     SETUP_OPTIONS
 commands=
     {envpython} setup.py --with-cython {env:SETUP_OPTIONS:} build install
-    {envpython} -m lupa.tests.__main__
+    {envpython} pytest lupa
 sitepackages=False