diff --git a/test/Project.toml b/test/Project.toml
index b2a8fca..170c644 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -17,4 +17,5 @@ Distributions = "0.25"
 Documenter = "0.26.3, 0.27, 1"
 InvertedIndices = "1"
 OffsetArrays = "1"
+OrderedCollections = "1"
 julia = "1"