diff --git a/pytests/pyproject.toml b/pytests/pyproject.toml
index 126eaf77..43403a12 100644
--- a/pytests/pyproject.toml
+++ b/pytests/pyproject.toml
@@ -24,6 +24,7 @@ dev = [
     "hypothesis>=3.55",
     "pytest-asyncio>=0.21",
     "pytest-benchmark>=3.4",
-    "pytest>=6.0",
+    # pinned < 8.1 because https://github.com/CodSpeedHQ/pytest-codspeed/issues/27
+    "pytest>=8,<8.1",
     "typing_extensions>=4.0.0"
 ]