diff --git a/Project.toml b/Project.toml
index bbd1b73..d7da760 100644
--- a/Project.toml
+++ b/Project.toml
@@ -20,6 +20,7 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 UnitfulAstro = "6112ee07-acf9-5e0f-b108-d242c714bf9f"
 
 [compat]
+OrderedCollections = "1"
 Distributions = "0.25"
 JLD2 = "0.4"
 UnitfulAstro = "1"