diff --git a/src/ReinforcementLearningExperiments/Project.toml b/src/ReinforcementLearningExperiments/Project.toml
index 8c4124746..bf9f2f07f 100644
--- a/src/ReinforcementLearningExperiments/Project.toml
+++ b/src/ReinforcementLearningExperiments/Project.toml
@@ -25,7 +25,7 @@ Flux = "0.13, 0.14"
 IntervalSets = "0.7"
 Reexport = "1"
 ReinforcementLearningBase = "0.12"
-ReinforcementLearningCore = "0.15"
+ReinforcementLearningCore = "0.13.1"
 ReinforcementLearningEnvironments = "0.8"
 ReinforcementLearningZoo = "0.10.1"
 StableRNGs = "1"
diff --git a/src/ReinforcementLearningZoo/Project.toml b/src/ReinforcementLearningZoo/Project.toml
index 624c03d26..5442e54b2 100644
--- a/src/ReinforcementLearningZoo/Project.toml
+++ b/src/ReinforcementLearningZoo/Project.toml
@@ -31,7 +31,7 @@ MLUtils = "0.4"
 NNlib = "0.8, 0.9"
 Optim = "1"
 ReinforcementLearningBase = "0.12"
-ReinforcementLearningCore = "0.15.1"
+ReinforcementLearningCore = "0.13.1"
 StatsBase = "0.33, 0.34"
 Zygote = "0.6"
 cuDNN = "1"