diff --git a/Project.toml b/Project.toml
index 4ae578b9..93fecaa1 100644
--- a/Project.toml
+++ b/Project.toml
@@ -30,6 +30,7 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 ChainRulesCore = "1"
 DelimitedFiles = "1"
 Distributions = "0.25"
+FiniteDifferences = "0.12"
 ForwardDiff = "0.10"
 Interpolations = "0.14, 0.15"
 LsqFit = "0.15"