diff --git a/Project.toml b/Project.toml
index d9cbf8d..fc1963e 100644
--- a/Project.toml
+++ b/Project.toml
@@ -21,6 +21,6 @@ PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
 DataStructures = "0.18.15 - 0.19"
 Graphs = "1.10"
 LinearAlgebra = "1.10"
-Optim = "1.13.2"
+Optim = "1.8"
 PrecompileTools = "1.2"
 julia = "1.10"