diff --git a/Project.toml b/Project.toml
index 9a6aa54..8bbb9a3 100644
--- a/Project.toml
+++ b/Project.toml
@@ -27,6 +27,7 @@ Interpolations = "0.13"
 JSON = "0.21"
 NCDatasets = "0.11"
 OffsetArrays = "1"
+OrderedCollections = "1"
 Parameters = "0.12"
 Polynomials = "2"
 Unitful = "1"