diff --git a/Project.toml b/Project.toml
index bc6f1e3..89661c3 100644
--- a/Project.toml
+++ b/Project.toml
@@ -14,6 +14,7 @@ SimpleWeightedGraphs = "47aef6b3-ad0c-573a-a1e2-d07658019622"
 SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 
 [compat]
+SpecialFunctions = "1"
 julia = "1.5"
 
 [extras]