diff --git a/Project.toml b/Project.toml
index bd463ca..68920c2 100644
--- a/Project.toml
+++ b/Project.toml
@@ -19,6 +19,7 @@ FileIO = "1"
 ImageFiltering = "0.4, 0.5, 0.6"
 ImageMagick = "0.7, 1"
 QuartzImageIO = "0.7"
+Requires = "1"
 julia = "1"
 
 [extras]