diff --git a/Project.toml b/Project.toml
index 1244a29..af4a33a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -11,6 +11,7 @@ SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 WignerD = "87c4ff3e-34df-11e9-37a7-516cea4e0402"
 
 [compat]
+SpecialFunctions = "1"
 julia = "1.6"
 
 [extras]