diff --git a/benchmarks/ParameterEstimation/Project.toml b/benchmarks/ParameterEstimation/Project.toml
index 762544189..9b44d291f 100644
--- a/benchmarks/ParameterEstimation/Project.toml
+++ b/benchmarks/ParameterEstimation/Project.toml
@@ -21,7 +21,7 @@ DiffEqParamEstim = "2"
 Distributions = "0.25"
 ForwardDiff = "0.10"
 NLopt = "0.6, 1"
-Optimization = "3"
+Optimization = "3, 4"
 OptimizationBBO = "0.1, 0.2"
 OptimizationNLopt = "0.1, 0.2"
 OrdinaryDiffEq = "6"