diff --git a/Project.toml b/Project.toml
index 9e8aaa8..bdb95f4 100644
--- a/Project.toml
+++ b/Project.toml
@@ -16,6 +16,7 @@ Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Unitfu = "5ee08b94-2369-4f4a-b8c7-99333ba35fb0"
 
 [compat]
+ColorSchemes = "3.9"
 MechanicalUnits = "0.3.1"
 julia = "1.3.0"