diff --git a/docs/Project.toml b/docs/Project.toml
index c568a8f8..662a7f6f 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -44,5 +44,6 @@ PlutoUI = "0.7"
 PosteriorStats = "0.1.1"
 StanSample = "7.0.1"
 StatisticalMeasures = "0.1"
+Statistics = "1"
 StatsBase = "0.32, 0.33, 0.34"
 Turing = "0.24.1, 0.25, 0.26, 0.27, 0.28"