diff --git a/Project.toml b/Project.toml
index 64e3752..c56772c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -16,7 +16,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 [compat]
 ArgParse = "0.6, 1"
 Cairo = "0.7, 0.8, 1"
-Colors = "0.9, 0.10, 0.11, 0.12"
+Colors = "0.9, 0.10, 0.11, 0.12, 0.13"
 Gadfly = "1"
 LinearAlgebra = "1"
 ProgressMeter = "1"