diff --git a/Project.toml b/Project.toml
index 2b9a167..8343926 100644
--- a/Project.toml
+++ b/Project.toml
@@ -33,7 +33,7 @@ FileIO = "1.6"
 FillArrays = "1.13.0"
 HDF5 = "0.16 - 0.99, 1"
 Logging = "1.6.7"
-OrderedCollections = "1.6"
+OrderedCollections = "1.6, 2.0"
 PooledArrays = "1"
 Preferences = "1.5.0"
 StructArrays = "0.6.4, 0.7"