diff --git a/Project.toml b/Project.toml
index b7a87b7..87d5920 100644
--- a/Project.toml
+++ b/Project.toml
@@ -13,6 +13,7 @@ SatelliteToolboxGeomagneticField = "9fc549ba-b5d7-49a2-b268-8171e5fb6e89"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
+Optim = "1"
 julia = "1.10"
 
 [extras]