diff --git a/pyproject.toml b/pyproject.toml
index c8a12d0..03e15b4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,7 +45,8 @@ test = [
     "scipy",
     "pandas",
     "h5py",
-]
+    "zarr >=2.16.0"
+    ]
 
 docs = [
     "pillow",