diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ee5ebe76c..f153d1f2a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -67,14 +67,14 @@ jobs:
             | awk '{print $2}')
           sudo apt-get -qq -y install "libpq-dev=${pqver}" "libpq5=${pqver}"
 
-      - name: Install tox
-        run: pip install "tox < 4"
       - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python }}
           allow-prereleases: true
+      - name: Install
+        run: pip install .
       - name: Run tests
         env:
-          MATRIX_PYTHON: ${{ matrix.python }}
-        run: tox -e ${MATRIX_PYTHON%-dev}
+          PYTHON_VERSION: ${{ matrix.python }}
+        run: make check
         timeout-minutes: 5
diff --git a/setup.cfg b/setup.cfg
index dcea6a984..b9b8f7552 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -20,3 +20,8 @@ libraries=
 
 [metadata]
 license_files = LICENSE
+
+[flake8]
+max-line-length = 85
+ignore = E128, W503, E741
+exclude = build, doc, tests/dbapi20.py
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index b56b7b6a0..000000000
--- a/tox.ini
+++ /dev/null
@@ -1,13 +0,0 @@
-[tox]
-envlist = {3.10,3.11,3.12,3.13,3.14,3.15}
-
-[testenv]
-commands = make check
-whitelist_externals = make
-passenv = PG* PSYCOPG2_TEST*
-basepython = python{envname}
-
-[flake8]
-max-line-length = 85
-ignore = E128, W503, E741
-exclude = build, doc, tests/dbapi20.py