diff --git a/pyproject.toml b/pyproject.toml
index 7d2be0074..eac1304a6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -172,6 +172,9 @@ addopts = [
 ]
 xfail_strict = true
 junit_family = "xunit2"
+markers = [
+    "asyncio: mark test to run with asyncio event loop",
+]
 filterwarnings = [
     "error",
     'ignore:starlette.middleware.wsgi is deprecated and will be removed in a future release\..*:DeprecationWarning:starlette',
diff --git a/requirements-tests.txt b/requirements-tests.txt
index c5de4157e..5e68223ed 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -1,6 +1,7 @@
 -e .[all]
 -r requirements-docs-tests.txt
 pytest >=7.1.3,<9.0.0
+pytest-asyncio >=0.21.0,<0.25.0
 coverage[toml] >= 6.5.0,< 8.0
 mypy ==1.14.1
 dirty-equals ==0.9.0