diff --git a/mythril/laser/ethereum/state/account.py b/mythril/laser/ethereum/state/account.py
index c6098d49..1c738767 100644
--- a/mythril/laser/ethereum/state/account.py
+++ b/mythril/laser/ethereum/state/account.py
@@ -94,7 +94,8 @@ class Storage:
         storage._standard_storage = deepcopy(self._standard_storage)
         storage.printable_storage = copy(self.printable_storage)
         storage.storage_keys_loaded = copy(self.storage_keys_loaded)
-        storage.keys_set = copy(self.keys_set)
+        storage.keys_set = deepcopy(self.keys_set)
+        storage.keys_get = deepcopy(self.keys_get)
         return storage
 
     def __str__(self) -> str:
diff --git a/requirements.txt b/requirements.txt
index 290772d2..7244e7db 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 blake2b-py
+cytools<0.12.0
 coloredlogs>=10.0
 coincurve>=13.0.0
 asn1crypto>=0.22.0