diff --git a/Project.toml b/Project.toml
index 9a3589e..5f177e7 100644
--- a/Project.toml
+++ b/Project.toml
@@ -17,4 +17,5 @@ WignerSymbols = "9f57e263-0b3d-5e2e-b1be-24f2bb48858b"
 [compat]
 QuantumLattices = "0.9.3"
 TightBindingApproximation = "0.1.15"
+WignerSymbols = "2"
 julia = "1.8"