diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8666e84..d02e4f7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## master (unreleased)
 
 * Added ``expiration_limit`` argument for ``get_skyfield_data_path`` function. Enables to shift the expiration date limit by "n" days.
+* USNO file serving host has changed. Pointing now at ``ftp://cddis.nasa.gov/products/iers/`` for ``deltat.*`` files.
 
 ## 0.1.0 (2019-10-04)
 
diff --git a/download.py b/download.py
index 2fde3f4..a35cd7b 100644
--- a/download.py
+++ b/download.py
@@ -12,7 +12,7 @@ from termcolor import colored
 init()
 
 JPL = "ftp://ssd.jpl.nasa.gov/pub/eph/planets/bsp"
-USNO = "http://maia.usno.navy.mil/ser7"
+USNO = "ftp://cddis.nasa.gov/products/iers/"
 IERS = "https://hpiers.obspm.fr/iers/bul/bulc"
 
 __DATA_PATH = abspath(join(dirname(__file__), "skyfield_data", "data"))