diff --git a/Project.toml b/Project.toml
index 2a58e340a4..57e8db1dab 100644
--- a/Project.toml
+++ b/Project.toml
@@ -20,6 +20,7 @@ SpineInterface = "0cda1612-498a-11e9-3c92-77fa82595a4f"
 TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
 
 [compat]
+HiGHS = "1"
 JSON = "0.21"
 JuMP = "^1.20"
 Requires = "1"