diff --git a/pyproject.toml b/pyproject.toml
index 23bf8b9b..e792fd33 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ test = [
     "scipy",
     "pandas",
     "h5py",
-    "zarr>=2.16.0"
+    "zarr>=2.16.0,<3.0.0"
 ]
 
 docs = [