diff --git a/requirements.txt b/requirements.txt
index a479ff5418165c0675fca236228cb117368e50e2..7c02f594c1ceb6f96ec922641ab7bcade4b38f4e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,4 +7,5 @@ networkx
 matplotlib
 numpy
 astropy_healpix
+healpy
 DBUtils==1.3
\ No newline at end of file