diff --git a/Project.toml b/Project.toml
index 56f3603..a4580e6 100644
--- a/Project.toml
+++ b/Project.toml
@@ -14,6 +14,7 @@ Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
+DataStructures = "0.18"
 julia = "1"
 
 [extras]