diff --git a/requirements.txt b/requirements.txt
index f7b2d001861fe417da9f7d52049177e89e6f31fc..4d1144be057841f4254e45ba33590528b14d5f21 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,7 @@ python_dateutil
 setuptools
 numpy
 pandas
+h5py; python_version < '3.7'
 tables
 scipy
 matplotlib