diff --git a/docs/Project.toml b/docs/Project.toml
index b71229d..69df2ed 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -28,7 +28,7 @@ ForwardDiff = "0.10"
 LeastSquaresOptim = "0.8"
 NLopt = "0.6, 1"
 Optim = "1"
-Optimization = "3"
+Optimization = "3, 4"
 OptimizationBBO = "0.1, 0.2, 0.3, 0.4"
 OptimizationMOI = "0.1, 0.2, 0.3, 0.4, 0.5"
 OptimizationNLopt = "0.1, 0.2, 0.3"