diff --git a/Project.toml b/Project.toml
index 01fcf1c8..8c170bb7 100644
--- a/Project.toml
+++ b/Project.toml
@@ -25,6 +25,7 @@ Arpack = "0.5.1 - 0.5.3"
 DiffEqBase = "6.113"
 DiffEqCallbacks = "2"
 FFTW = "1"
+ForwardDiff = "0.10"
 IterativeSolvers = "0.9"
 LinearMaps = "3"
 OrdinaryDiffEq = "5, 6"