diff --git a/Project.toml b/Project.toml
index 6fd1b9f..756e07f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -63,7 +63,7 @@ BytePairEncoding = "0.5.1"
 CUDA = "5"
 ChainRulesCore = "1.15"
 DataDeps = "0.7"
-DataStructures = "0.18"
+DataStructures = "0.18, 0.19"
 DelimitedFiles = "1"
 DoubleArrayTries = "0.1"
 Fetch = "0.1.3"