diff --git a/docs/Project.toml b/docs/Project.toml
index 9135b7c..a340f6a 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -30,6 +30,7 @@ KernelDensity = "0.6"
 MCMCChains = "6"
 Optimization = "3"
 OptimizationMOI = "0.1"
+OptimizationNLopt = "0.1"
 OrdinaryDiffEq = "6"
 SciMLSensitivity = "7"
 StatsPlots = "0.15"