diff --git a/Project.toml b/Project.toml
index 9a3589e..cce107f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -15,6 +15,7 @@ TimerOutputs = "a759f4b9-e2f1-59dc-863e-4aeb61b1ea8f"
 WignerSymbols = "9f57e263-0b3d-5e2e-b1be-24f2bb48858b"
 
 [compat]
+Optim = "1"
 QuantumLattices = "0.9.3"
 TightBindingApproximation = "0.1.15"
 julia = "1.8"