diff --git a/Project.toml b/Project.toml
index c97db901..4fce4bd5 100644
--- a/Project.toml
+++ b/Project.toml
@@ -16,7 +16,7 @@ DataFrames = "1"
 JLD2 = "0.4"
 JuMP = "~0.19, ~0.20, ~0.21, ~0.22, 0.23, 1"
 Requires = "1"
-SpecialFunctions = "1"
+SpecialFunctions = "2"
 julia = "~1"
 
 [extras]