diff --git a/Project.toml b/Project.toml
index 68ece85cd..e9dd8df74 100644
--- a/Project.toml
+++ b/Project.toml
@@ -42,7 +42,7 @@ MPSKit = "0.13.9"
 MPSKitModels = "0.4"
 MatrixAlgebraKit = "0.6.5"
 OhMyThreads = "0.7, 0.8"
-OptimKit = "0.4"
+OptimKit = "0.4, 0.5"
 Printf = "1"
 Random = "1"
 Statistics = "1"