diff --git a/Project.toml b/Project.toml
index cbbf2fa..695eda0 100644
--- a/Project.toml
+++ b/Project.toml
@@ -16,6 +16,7 @@ SatelliteToolboxGeomagneticField = "9fc549ba-b5d7-49a2-b268-8171e5fb6e89"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
+Accessors = "0.1"
 ConcreteStructs = "0.2"
 Optim = "1"
 Plots = "1"