diff --git a/Project.toml b/Project.toml
index d480ea9..a609f04 100644
--- a/Project.toml
+++ b/Project.toml
@@ -14,6 +14,7 @@ ResumableFunctions = "c5292f4c-5179-55e1-98c5-05642aab7184"
 
 [compat]
 ResumableFunctions = "^0.6"
+DataStructures = "^0.18"
 julia = "^1.2"
 
 [extras]