diff --git a/Project.toml b/Project.toml
index 47970f5d0..49bd4cb98 100644
--- a/Project.toml
+++ b/Project.toml
@@ -47,6 +47,7 @@ DiffEqDevTools = "2"
 ExponentialUtilities = "1"
 FastBroadcast = "0.2"
 FastGaussQuadrature = "0.5, 1"
+FillArrays = "1.9"
 FiniteHorizonGramians = "0.1"
 ForwardDiff = "0.10"
 FunctionWrappersWrappers = "0.1.3"