diff --git a/pyproject.toml b/pyproject.toml
index da585fe..f4245c6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ dependencies = [
     "pyarrow",
     "networkx",
     "session-info",
-    "zarr",
+    "zarr>=2,<3",
 ]
 
 [project.optional-dependencies]