diff --git a/Project.toml b/Project.toml
index 76f1f68..edc7cbf 100644
--- a/Project.toml
+++ b/Project.toml
@@ -30,7 +30,7 @@ AtomsCalculators = "0.2.3"
 DocStringExtensions = "0.9"
 LineSearches = "7"
 Optim = "1.11.0"
-Optimization = "3, 4"
+Optimization = "3, 4, 5.5"
 PrettyTables = "2"
 StaticArrays = "1"
 TestItemRunner = "0.2, 1"