diff --git a/Project.toml b/Project.toml
index 0f7d8f2..40d09f6 100644
--- a/Project.toml
+++ b/Project.toml
@@ -25,6 +25,7 @@ StatsAPI = "82ae8749-77ed-4fe6-ae5f-f523153014b0"
 [compat]
 Distributions = "0.25"
 FillArrays = "0, 1"
+FiniteDiff = "2"
 MultivariateStats = "0"
 Statistics = "1"
 StatsAPI = "1"