diff --git a/Project.toml b/Project.toml
index 5ad46445..2f36aeaf 100644
--- a/Project.toml
+++ b/Project.toml
@@ -74,6 +74,7 @@ JSON3 = "1.12.0, 3"
 LoggingExtras = "1.0.0, 3"
 MarkdownTables = "1.1.0, 3"
 Observables = "0.5.4, 1"
+OrderedCollections = "1"
 Parameters = "0.12.3, 1"
 PovertyAndInequalityMeasures = "1.0.10,2"
 PrettyTables = "1.3.1, 2"