diff --git a/backend/requirements.txt b/backend/requirements.txt
index 8c99dc9..2d29726 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -22,7 +22,7 @@ redis==5.2.1
 
 # ── Orbit Propagation ────────────────────────────────────────
 skyfield==1.49
-sgp4==2.23
+sgp4==2.27
 numpy==2.2.1
 scipy==1.15.1
 astropy==6.1.7