diff --git a/requirements.txt b/requirements.txt
index 4a9945d9de28185aeb497ff77ccf92f017213bef..df53d850646a09a2991385da84c8de17123aea2e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,7 @@ statsmodels
 # data I/O
 cdo
 python-cdo
+cdsapi
 xarray
 dask
 gdal