diff --git a/tests/requirements.txt b/tests/requirements.txt
index 4a71eb1..a58a885 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -34,7 +34,7 @@ protobuf
     #   ray
 pyarrow
     # via btrdb
-pytest
+pytest <9
     # via
     #   btrdb
     #   pytest-cov