diff --git a/docs/Project.toml b/docs/Project.toml
index c03257c..6be7c97 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -24,3 +24,4 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 
 [compat]
 Literate = "2"
+Unitful = "1.28.0"