diff --git a/Project.toml b/Project.toml
index 7d3cfa6..0e8abc0 100644
--- a/Project.toml
+++ b/Project.toml
@@ -10,6 +10,7 @@ FASTX = "c2308a5c-f048-11e8-3e8a-31650f418d12"
 Scratch = "6c6a2e73-6563-6170-7368-637461726353"
 
 [compat]
+BioSequences = "3"
 julia = "1"
 
 [extras]