diff --git a/Project.toml b/Project.toml
index 219c7ce..1e83c75 100644
--- a/Project.toml
+++ b/Project.toml
@@ -20,6 +20,7 @@ PenaltyFunctions = "0.1"
 RecipesBase = "0.7, 0.8"
 StatsBase = "0.32"
 SweepOperator = "0.3"
+julia = "1.2"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"