diff --git a/Project.toml b/Project.toml
index 0f7754e..a7b83cf 100644
--- a/Project.toml
+++ b/Project.toml
@@ -14,6 +14,7 @@ JuliaInterpreter = "aa1ae85d-cabe-5617-a682-6adf51b2e16a"
 Revise = "295af30f-e4ad-537b-8983-00126c2a3abe"
 
 [compat]
+Ipopt = "0.6"
 julia = "1"
 
 [extras]