diff --git a/cht_cyclones/cyclone_track_database.py b/cht_cyclones/cyclone_track_database.py
index e3ef658..268a6a2 100644
--- a/cht_cyclones/cyclone_track_database.py
+++ b/cht_cyclones/cyclone_track_database.py
@@ -1,11 +1,12 @@
+import datetime
 import os
-import xarray as xr
+from functools import reduce
+
+import geopandas as gpd
 import numpy as np
 import pandas as pd
-from functools import reduce
 import shapely
-import geopandas as gpd
-import datetime
+import xarray as xr
 
 from .tropical_cyclone import TropicalCyclone
 
diff --git a/environment.yml b/environment.yml
index c0b737d..80ed278 100644
--- a/environment.yml
+++ b/environment.yml
@@ -10,6 +10,7 @@ dependencies:
   - pip
   - numpy
   - scipy
+  - xarray
   - pandas
   - geopandas
   - matplotlib
diff --git a/pyproject.toml b/pyproject.toml
index 52b23b6..3e9c13a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,6 +8,7 @@ name = "cht_cyclones"
 #description = "Combining of tidal components to time series"
 readme = "README.md"
 authors = [
+    { name = "Maarten van Ormondt", email = "maarten.vanormondt@deltares.nl"},
     { name = "Julian Hofer", email = "Julian.Hofer@deltares.nl" },
     { name = "Sarwan Peiter", email = "Sarwan.Peiter@deltares.nl" },
 ]
@@ -17,7 +18,7 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Hydrology",
 ]
 requires-python = ">=3.10"
-dependencies = ["numpy", "scipy", "pandas", "geopandas","matplotlib", "shapely","fiona"]
+dependencies = ["numpy", "scipy", "pandas", "geopandas","matplotlib", "shapely","xarray"]
 dynamic = ["version"]
 
 [project.optional-dependencies]