diff --git a/docs/Project.toml b/docs/Project.toml
index bfa9246..2cfbee6 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -24,7 +24,7 @@ EasyModelAnalysis = "0.1, 1"
 Ipopt = "1"
 ModelingToolkit = "9"
 NLopt = "0.6, 1"
-Optimization = "3"
+Optimization = "3, 4"
 OptimizationMOI = "0.4, 0.5"
 Plots = "1"
 SBMLToolkit = "0.1"