diff --git a/setup.py b/setup.py
index 92a1dfd2..1f20ea26 100644
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@
         "lxml>=4.2",
         "pydap>=3.3",
         "rasterio>=1.0",
-        "zarr>=2.3",
+        "zarr>=2.3,<3",
         "owslib",
         "h5netcdf"
         # "intake>=0.5"  Not supported in Python 3.5