diff --git a/Project.toml b/Project.toml
index 1a15cb4..448aa69 100644
--- a/Project.toml
+++ b/Project.toml
@@ -30,6 +30,7 @@ Optim = "1.3"
 Parameters = "0.12"
 PrettyTables = "2"
 Roots = "2"
+SpecialFunctions = "2.4"
 StaticArrays = "1.1"
 Unitful = "1.7"
 UnitfulAtomic = "1.0"