diff --git a/Project.toml b/Project.toml
index 3ae9204..a1efa44 100644
--- a/Project.toml
+++ b/Project.toml
@@ -20,6 +20,7 @@ ZygoteExt = "Zygote"
 AssigningSecondaryStructure = "0.4"
 Backboner = "0.11"
 BioStructures = "4"
+OrderedCollections = "1"
 Zygote = "0.6"
 julia = "1"