diff --git a/Project.toml b/Project.toml
index 1e4f327..1fb6ee3 100644
--- a/Project.toml
+++ b/Project.toml
@@ -9,6 +9,7 @@ JuMP = "4076af6c-e467-56ae-b986-b466b2749572"
 MathOptInterface = "b8f27783-ece8-5eb3-8dc8-9495eed66fee"
 
 [compat]
+Ipopt = "1"
 julia = "1.6"
 
 [extras]