diff --git a/Project.toml b/Project.toml
index c65810ad..550e4f85 100644
--- a/Project.toml
+++ b/Project.toml
@@ -78,7 +78,7 @@ OrderedCollections = "~1.1, ~1.2, =1.3.1, =1.3.2"
 PackageCompiler = "^0.6.4, 1.0, 1.1, 1.2"
 Plots = "0.19, 0.20, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, ~1.1, ~1.2, ~1.3, ~1.4, ~1.5, ~1.6, ~1.7, ~1.8, ~1.9, ~1.10, 1.14, 1.15"
 RecipesBase = "0.5, 0.7, 0.8, 1.0"
-Roots = "0.7, 0.8, 1.0"
+Roots = "0.7, 0.8, 1.0, 2.2"
 SMC = "0.1.10, ^0.1.11, 0.2"
 SpecialFunctions = "0.7, 0.8, 0.10, 1"
 StateSpaceRoutines = "^0.3.1, 0.4"