diff --git a/src/ReinforcementLearningCore/Project.toml b/src/ReinforcementLearningCore/Project.toml
index 4711550ae..b47068503 100644
--- a/src/ReinforcementLearningCore/Project.toml
+++ b/src/ReinforcementLearningCore/Project.toml
@@ -40,7 +40,7 @@ Distributions = "0.24, 0.25"
 ElasticArrays = "1.2"
 FillArrays = "0.8, 0.9, 0.10, 0.11, 0.12"
 Flux = "0.12"
-Functors = "0.1, 0.2"
+Functors = "0.1, 0.2, 0.3"
 GPUArrays = "5, 6.0, 7, 8"
 MacroTools = "0.5"
 ProgressMeter = "1.2"