diff --git a/src/ReinforcementLearningCore/Project.toml b/src/ReinforcementLearningCore/Project.toml
index 9ef979f4f..bb7aeabf6 100644
--- a/src/ReinforcementLearningCore/Project.toml
+++ b/src/ReinforcementLearningCore/Project.toml
@@ -31,6 +31,7 @@ Adapt = "2"
 BSON = "0.2"
 CUDA = "1"
 Distributions = "0.22, 0.23"
+ElasticArrays = "1.2"
 FillArrays = "0.8, 0.9"
 Flux = "0.11.1"
 GPUArrays = "5"