diff --git a/src/ReinforcementLearningZoo/Project.toml b/src/ReinforcementLearningZoo/Project.toml
index 61097650e..af09f9d34 100644
--- a/src/ReinforcementLearningZoo/Project.toml
+++ b/src/ReinforcementLearningZoo/Project.toml
@@ -34,7 +34,7 @@ Flux = "0.12"
 IntervalSets = "0.5"
 MacroTools = "0.5"
 ReinforcementLearningBase = "0.9"
-ReinforcementLearningCore = "0.8.2"
+ReinforcementLearningCore = "0.8.2, 0.9"
 Setfield = "0.6, 0.7, 0.8"
 StatsBase = "0.32, 0.33"
 StructArrays = "0.4, 0.5, 0.6"