diff --git a/Project.toml b/Project.toml
index 7b726f94..a790dcce 100644
--- a/Project.toml
+++ b/Project.toml
@@ -63,7 +63,7 @@ RecipesBase = "1"
 Roots = "1"
 SciMLBase = "1"
 Sobol = "1.3, 1.4"
-SpecialFunctions = "0.9, 0.10, 1"
+SpecialFunctions = "0.9, 0.10, 1, 2"
 StaticArrays = "0.11, 0.12, 1"
 Suppressor = "0.1, 0.2"
 SymbolicUtils = "0.11.3 - 0.17, 0.18"