diff --git a/environment.yml b/environment.yml
index 816a1eebdd..02c4689ea6 100644
--- a/environment.yml
+++ b/environment.yml
@@ -19,7 +19,7 @@ dependencies:
   - cftime>=1.3.1
   - dask>=2.0
   - scikit-learn
-  - zarr>=2.11.0,!=2.18.0
+  - zarr>=2.11.0,!=2.18.0,<3
 
   # Testing
   - nbval
diff --git a/pyproject.toml b/pyproject.toml
index 70d202689a..af6d4fb8c5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -149,7 +149,7 @@ module = [
     "mpi4py",
     "scipy.spatial",
     "sklearn.cluster",
-    "zarr",
+    "zarr>=2.11.0,!=2.18.0,<3",
     "cftime",
     "pykdtree.kdtree",
     "netCDF4",