diff --git a/docs/Project.toml b/docs/Project.toml
index a6a524dbc..060076341 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -56,6 +56,7 @@ Juniper = "0.9"
 Manifolds = "0.9"
 Manopt = "0.4"
 ModelingToolkit = "9"
+NLPModels = "0.21"
 NLPModelsTest = "0.10"
 NLopt = "0.6, 1"
 Optimization = "3"