diff --git a/Project.toml b/Project.toml
index e7e1158..9a4c45a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -19,6 +19,7 @@ Revise = "295af30f-e4ad-537b-8983-00126c2a3abe"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
+Optimization = "3"
 julia = "1"
 
 [extras]