diff --git a/Project.toml b/Project.toml
index ffef8c4a8..81e2a06e5 100644
--- a/Project.toml
+++ b/Project.toml
@@ -40,7 +40,7 @@ JuMP = "1"
 MadNLPGPU = "0.7"
 MadNLPMumps = "0.5"
 NLPModelsIpopt = "0.11"
-OptimalControl = "=1.1.6"
+OptimalControl = "=1.1.6, 2"
 OptimalControlProblems = "0.5"
 Pkg = "1"
 Plots = "1.41"