diff --git a/lib/OptimizationBBO/Project.toml b/lib/OptimizationBBO/Project.toml
index d69112d54..6966399a8 100644
--- a/lib/OptimizationBBO/Project.toml
+++ b/lib/OptimizationBBO/Project.toml
@@ -10,7 +10,7 @@ Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 
 [compat]
 BlackBoxOptim = "0.6"
-Optimization = "3.21"
+Optimization = "3.21, 4"
 Reexport = "1.2"
 julia = "1"