diff --git a/Project.toml b/Project.toml
index 5239a10..0a6665f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -30,6 +30,7 @@ Discretizers = "3.2"
 ImageMagick = "0.7.3, 1"
 Images = "0.22"
 IndirectArrays = "0.5"
+Requires = "1.0.1"
 StatsBase = "0.33"
 TikzPictures = "3.1"
 julia = "1"