diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..c357ddf
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,5 @@
+numpy
+scipy
+matplotlib
+
+fluidfoam
diff --git a/swash/processing/sws_npz.py b/swash/processing/sws_npz.py
index 5f7fa2a..3c971ab 100644
--- a/swash/processing/sws_npz.py
+++ b/swash/processing/sws_npz.py
@@ -5,7 +5,6 @@ import pathlib
 from multiprocessing.pool import ThreadPool
 
 import numpy as np
-import pandas as pd
 
 from .read_swash import ReadSwash