diff --git a/docs/Project.toml b/docs/Project.toml
index c61a42c7d6..62ddbecb35 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -47,7 +47,7 @@ Documenter = "1"
 DynamicQuantities = "^0.11.2, 0.12, 1"
 FMI = "0.14"
 FMIZoo = "1"
-InfiniteOpt = "0.5"
+InfiniteOpt = "0.5, 0.6"
 Ipopt = "1"
 JumpProcesses = "9"
 ModelingToolkit = "10"