diff --git a/Project.toml b/Project.toml
index 0a29fbc72..ca18875e4 100644
--- a/Project.toml
+++ b/Project.toml
@@ -34,6 +34,7 @@ Accessors = "0.1"
 ChainRulesCore = "1.0"
 Compat = "3.46, 4.2"
 DocStringExtensions = "0.9.3"
+FiniteDifferences = "0.12"
 KrylovKit = "0.9.5, 0.10"
 LinearAlgebra = "1"
 LoggingExtras = "1"