diff --git a/test/Project.toml b/test/Project.toml
index 0f2ae36..d01763e 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -10,4 +10,5 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
+HSL = "0.4"
 NLPModelsIpopt = "0.10"