diff --git a/tox.ini b/tox.ini
index 50ac7aa86..23d053304 100644
--- a/tox.ini
+++ b/tox.ini
@@ -52,6 +52,7 @@ deps =
 deps =
     {[test-requirements]deps}
     pytest >= 8.4.1  # https://github.com/pytest-dev/pytest/pull/13502
+    deltatest-cli
 passenv =
     PYTEST_ADDOPTS
     S3_TEST_FILE_URI
@@ -60,10 +61,12 @@ passenv =
     AWS_SESSION_TOKEN
     GCS_TEST_FILE_URI
     GCS_PROJECT_ID
+    DELTA_*
+    GITHUB_*
 #allow tox virtualenv to upgrade pip/wheel/setuptools
 download = true
 commands =
-    pytest {posargs:--cov-config=pyproject.toml --cov=scrapy --cov-report= --cov-report=term-missing --cov-report=xml --junitxml=testenv.junit.xml -o junit_family=legacy --durations=10 scrapy tests --doctest-modules}
+    delta run -- {posargs:--cov-config=pyproject.toml --cov=scrapy --cov-report= --cov-report=term-missing --cov-report=xml --junitxml=testenv.junit.xml -o junit_family=legacy --durations=10 tests --doctest-modules}
 
 [testenv:mypy]
 basepython = python3.10