diff --git a/requirements.txt b/requirements.txt
index a6ff4a5..fe29a3e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,4 +20,5 @@ atmosphericRadiationDoseAndFlux >= 1.0.3
 kpindex >= 2.0.0
 ipywidgets >= 8.1.5
 dask >= 2025.1.0
+pyarrow >= 18.1.0
 
diff --git a/setup.py b/setup.py
index d093315..81d7fbc 100644
--- a/setup.py
+++ b/setup.py
@@ -56,7 +56,8 @@
                         'atmosphericRadiationDoseAndFlux >= 1.0.3',
                         'kpindex >= 2.0.0',
                         'ipywidgets >= 8.1.5',
-                        'dask>=2025.1.0'],
+                        'dask>=2025.1.0',
+                        'pyarrow >= 18.1.0'],
     #install_requires,
     setup_requires=['pytest-runner','wheel'],
     tests_require=['pytest'],