diff --git a/setup.cfg b/setup.cfg
index 3edeb7d..712a6b9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -59,6 +59,7 @@ install_requires =
     Markdown~=2.6.0
     django-filter~=1.1.0
     # Astronomy
+    sgp4~=1.4.0
     satellitetle~=0.5.0
     # Unsorted
     influxdb~=5.2.0