diff --git a/Project.toml b/Project.toml
index f4e9aae..4e0b491 100644
--- a/Project.toml
+++ b/Project.toml
@@ -7,6 +7,7 @@ version = "0.1.0"
 Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 
 [compat]
+Unitful = "1"
 julia = "1"
 
 [extras]