diff --git a/setup.cfg b/setup.cfg
index c7a8c29373ecc489309b8c90e04305a2841535fb..2dfa61819f1101e341e61622bf5cec59a6e38394 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -37,6 +37,7 @@ install_requires =
     hist
     importlib_resources
     prettytable
+    astropy
     setuptools_scm
     uproot
 python_requires = >=3.6