diff --git a/Project.toml b/Project.toml
index c8bdbe96..f245ba1d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -76,7 +76,7 @@ PyPlot = "2.9"
 QuadGK = "2.4"
 Reexport = "1.2"
 Roots = "0.8.4, 1"
-SpecialFunctions = "0.10.3, 1"
+SpecialFunctions = "0.10.3, 1, 2"
 StaticArrays = "1"
 Unitful = "1"
 julia = "1.5"