diff --git a/Project.toml b/Project.toml
index 3246cfb..2e8febe 100644
--- a/Project.toml
+++ b/Project.toml
@@ -11,6 +11,7 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
+Optim = "1"
 Intervals = "1"
 julia = "1"