diff --git a/docs/Project.toml b/docs/Project.toml
index 17599b5..fd6da4d 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -6,3 +6,6 @@ Optim = "429524aa-4258-5aef-a3af-852621145aeb"
 PDMats = "90014a1f-27ba-587c-ab20-58faa44d9150"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 StatsPlots = "f3b207a7-027a-5e70-b257-86293d7955fd"
+
+[compat]
+StatsPlots = "0.15.8"