diff --git a/.github/workflows/integtests.yaml b/.github/workflows/integtests.yaml
index 87bf329..0e15961 100644
--- a/.github/workflows/integtests.yaml
+++ b/.github/workflows/integtests.yaml
@@ -29,8 +29,7 @@ jobs:
           bin/fades -v -d pytest -x pytest --version
       - name: Using a different Python
         run: |
-          export TEST_PYTHON_VERSION=3.9
-          python bin/fades -v --python=python3.9 -d pytest -x pytest -v tests/integtest.py
+          python bin/fades -v --python=python3.9 -d pytest -x pytest -v --integtest-pyversion=3.9 tests/integtest.py
 
   fedora:
     runs-on: ubuntu-latest
@@ -54,8 +53,7 @@ jobs:
         run: |
           yum install --assumeyes python3.9
           cd /fades
-          export TEST_PYTHON_VERSION=3.9
-          python3.12 bin/fades -v --python=python3.9 -d pytest -x pytest -v tests/integtest.py
+          python3.12 bin/fades -v --python=python3.9 -d pytest -x pytest -v --integtest-pyversion=3.9 tests/integtest.py
 
   native-windows:
     strategy:
@@ -91,7 +89,7 @@ jobs:
 
       - name: Using a different Python
         run: |
-          TEST_PYTHON_VERSION=3.10 ${{ steps.matrixpy.outputs.python-path }} bin/fades -v --python=${{ steps.otherpy.outputs.python-path }} -d pytest -x pytest -v tests/integtest.py
+          ${{ steps.matrixpy.outputs.python-path }} bin/fades -v --python=${{ steps.otherpy.outputs.python-path }} -d pytest -x pytest -v --integtest-pyversion=3.10 tests/integtest.py
 
   native-generic:
     strategy:
@@ -126,5 +124,4 @@ jobs:
 
       - name: Using a different Python
         run: |
-          export TEST_PYTHON_VERSION=3.10
-          ${{ steps.matrixpy.outputs.python-path }} bin/fades -v --python=python3.10 -d pytest -x pytest -v tests/integtest.py
+          ${{ steps.matrixpy.outputs.python-path }} bin/fades -v --python=python3.10 -d pytest -x pytest -v --integtest-pyversion=3.10 tests/integtest.py
diff --git a/tests/conftest.py b/tests/conftest.py
index ada0eb1..612abdb 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -29,3 +29,8 @@ def add_content(lines):
 
     yield add_content
     shutil.rmtree(str(dir_path))
+
+
+def pytest_addoption(parser):
+    """Define new pytest command line argument to be used by integration tests."""
+    parser.addoption("--integtest-pyversion", action="store")
\ No newline at end of file
diff --git a/tests/integtest.py b/tests/integtest.py
index 949d2a3..01f14c3 100644
--- a/tests/integtest.py
+++ b/tests/integtest.py
@@ -24,8 +24,8 @@
 import sys
 
 
-def test_assert_python_version():
-    expected = os.environ.get("TEST_PYTHON_VERSION")
+def test_assert_python_version(pytestconfig):
+    expected = pytestconfig.getoption("integtest_pyversion")
     vi = sys.version_info
     current = f"{vi.major}.{vi.minor}"
     assert current == expected