diff --git a/Project.toml b/Project.toml
index 3fc9a4fbd..508f860e8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -69,6 +69,7 @@ ProgressMeter = "1.5"
 RadiationDetectorSignals = "0.3"
 Random = "<0.0.1, 1"
 RecipesBase = "1.0, 1.1, 1.2, 1.3"
+Requires = "1.1, 1.2, 1.3"
 Rotations = "1.0"
 StaticArrays = "1"
 Statistics = "<0.0.1, 1"