diff --git a/.github/workflows/setup.yml b/.github/workflows/setup.yml
index 338fd6a..fc255c2 100644
--- a/.github/workflows/setup.yml
+++ b/.github/workflows/setup.yml
@@ -45,7 +45,7 @@ jobs:
         CIBW_ARCHS: ${{ matrix.config.arch }}
         CIBW_BUILD: cp*-${{ matrix.config.platform }}
         CIBW_SKIP: cp36* cp37*
-        CIBW_BEFORE_TEST: pip install pytest
+        CIBW_TEST_EXTRAS: test
         CIBW_TEST_COMMAND: pytest {project}/test_siphashc.py {project}/README.rst
 
     - name: Publish package distributions to PyPI
diff --git a/pyproject.toml b/pyproject.toml
index 4061d3e..4c84615 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,6 +25,9 @@ name = "Michal Čihař"
 [project.license]
 text = "ISC"
 
+[project.optional-dependencies]
+test = ["pytest"]
+
 [project.readme]
 content-type = "text/x-rst"
 file = "README.rst"