diff --git a/lib/OptimizationBBO/Project.toml b/lib/OptimizationBBO/Project.toml
index 7977ee438..c17e4b3f5 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 = "4"
+Optimization = "4, 3"
 Reexport = "1.2"
 julia = "1"