diff --git a/Project.toml b/Project.toml
index 01e2132..a0f4213 100644
--- a/Project.toml
+++ b/Project.toml
@@ -23,7 +23,7 @@ Colors = "0.9, 0.10, 0.11, 0.12"
 Distributions = "0.22, 0.23, 0.24, 0.25"
 Polynomials = "0.6, 0.7, 0.8, 1.1, 2.0"
 RecipesBase = "0.7, 0.8, 1.0"
-SpecialFunctions = "0.7, 0.8, 0.9, 0.10, 1.0, 1.1, 1.2"
+SpecialFunctions = "0.7, 0.8, 0.9, 0.10, 1.0, 1.1, 1.2, 2.0"
 StaticArrays = "0.12, 1.0, 1.1"
 Trajectories = "0.1, 0.2"
 julia = "1"