diff --git a/Project.toml b/Project.toml
index 9a23c237..3528e566 100644
--- a/Project.toml
+++ b/Project.toml
@@ -95,7 +95,7 @@ PyPlot = "2.9"
 QuadGK = "2.4"
 Random = "1.9"
 Reexport = "1.2"
-Roots = "2"
+Roots = "2, 3"
 Scratch = "1"
 SpecialFunctions = "0.10.3, 1, 2"
 StaticArrays = "1"