diff --git a/docs/Project.toml b/docs/Project.toml
index 35c2ad9..b97efe8 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -23,5 +23,6 @@ FiniteDiff = "2.29.0"
 ForwardDiff = "1.3.1"
 ImplicitDifferentiation = "0.9.1"
 Literate = "2.21.0"
+Optim = "2.0.1"
 NonlinearSolve = "4.17.1"
 Zygote = "0.7.10"