diff --git a/skrl/envs/wrappers/jax/pettingzoo_envs.py b/skrl/envs/wrappers/jax/pettingzoo_envs.py
index 1e524c9a..180e0209 100644
--- a/skrl/envs/wrappers/jax/pettingzoo_envs.py
+++ b/skrl/envs/wrappers/jax/pettingzoo_envs.py
@@ -1,12 +1,17 @@
 from typing import Any, Mapping, Tuple, Union
 
 import collections
-import gymnasium
 
 import jax
 import numpy as np
 
 from skrl.envs.wrappers.jax.base import MultiAgentEnvWrapper
+from skrl.utils.spaces.jax import (
+    flatten_tensorized_space,
+    tensorize_space,
+    unflatten_tensorized_space,
+    untensorize_space
+)
 
 
 class PettingZooWrapper(MultiAgentEnvWrapper):
@@ -18,49 +23,6 @@ def __init__(self, env: Any) -> None:
         """
         super().__init__(env)
 
-    def _observation_to_tensor(self, observation: Any, space: gymnasium.Space) -> np.ndarray:
-        """Convert the Gymnasium observation to a flat tensor
-
-        :param observation: The Gymnasium observation to convert to a tensor
-        :type observation: Any supported Gymnasium observation space
-
-        :raises: ValueError if the observation space type is not supported
-
-        :return: The observation as a flat tensor
-        :rtype: np.ndarray
-        """
-        if isinstance(observation, int):
-            return np.array(observation, dtype=np.int32).view(self.num_envs, -1)
-        elif isinstance(observation, np.ndarray):
-            return observation.reshape(self.num_envs, -1).astype(np.float32)
-        elif isinstance(space, gymnasium.spaces.Discrete):
-            return np.array(observation, dtype=np.float32).reshape(self.num_envs, -1)
-        elif isinstance(space, gymnasium.spaces.Box):
-            return observation.reshape(self.num_envs, -1).astype(np.float32)
-        elif isinstance(space, gymnasium.spaces.Dict):
-            tmp = np.concatenate([self._observation_to_tensor(observation[k], space[k]) \
-                for k in sorted(space.keys())], axis=-1).view(self.num_envs, -1)
-            return tmp
-        else:
-            raise ValueError(f"Observation space type {type(space)} not supported. Please report this issue")
-
-    def _tensor_to_action(self, actions: np.ndarray, space: gymnasium.Space) -> Any:
-        """Convert the action to the Gymnasium expected format
-
-        :param actions: The actions to perform
-        :type actions: np.ndarray
-
-        :raise ValueError: If the action space type is not supported
-
-        :return: The action in the Gymnasium format
-        :rtype: Any supported Gymnasium action space
-        """
-        if isinstance(space, gymnasium.spaces.Discrete):
-            return actions.item()
-        elif isinstance(space, gymnasium.spaces.Box):
-            return actions.astype(space.dtype).reshape(space.shape)
-        raise ValueError(f"Action space type {type(space)} not supported. Please report this issue")
-
     def step(self, actions: Mapping[str, Union[np.ndarray, jax.Array]]) -> \
         Tuple[Mapping[str, Union[np.ndarray, jax.Array]], Mapping[str, Union[np.ndarray, jax.Array]],
               Mapping[str, Union[np.ndarray, jax.Array]], Mapping[str, Union[np.ndarray, jax.Array]],
@@ -75,11 +37,11 @@ def step(self, actions: Mapping[str, Union[np.ndarray, jax.Array]]) -> \
         """
         if self._jax:
             actions = jax.device_get(actions)
-        actions = {uid: self._tensor_to_action(action, self.action_space(uid)) for uid, action in actions.items()}
+        actions = {uid: untensorize_space(self.action_spaces[uid], unflatten_tensorized_space(self.action_spaces[uid], action)) for uid, action in actions.items()}
         observations, rewards, terminated, truncated, infos = self._env.step(actions)
 
         # convert response to numpy or jax
-        observations = {uid: self._observation_to_tensor(value, self.observation_space(uid)) for uid, value in observations.items()}
+        observations = {uid: flatten_tensorized_space(tensorize_space(self.observation_spaces[uid], value, self.device, False), False) for uid, value in observations.items()}
         rewards = {uid: np.array(value, dtype=np.float32).reshape(self.num_envs, -1) for uid, value in rewards.items()}
         terminated = {uid: np.array(value, dtype=np.int8).reshape(self.num_envs, -1) for uid, value in terminated.items()}
         truncated = {uid: np.array(value, dtype=np.int8).reshape(self.num_envs, -1) for uid, value in truncated.items()}
@@ -96,7 +58,7 @@ def state(self) -> Union[np.ndarray, jax.Array]:
         :return: State
         :rtype: np.ndarray or jax.Array
         """
-        state = self._observation_to_tensor(self._env.state(), next(iter(self.state_spaces.values())))
+        state = flatten_tensorized_space(tensorize_space(next(iter(self.state_spaces.values())), self._env.state(), self.device, False), False)
         if self._jax:
             state = jax.device_put(state, device=self.device)
         return state
@@ -115,7 +77,7 @@ def reset(self) -> Tuple[Mapping[str, Union[np.ndarray, jax.Array]], Mapping[str
             observations, infos = outputs
 
         # convert response to numpy or jax
-        observations = {uid: self._observation_to_tensor(value, self.observation_space(uid)) for uid, value in observations.items()}
+        observations = {uid: flatten_tensorized_space(tensorize_space(self.observation_spaces[uid], value, self.device, False), False) for uid, value in observations.items()}
         if self._jax:
             observations = {uid: jax.device_put(value, device=self.device) for uid, value in observations.items()}
         return observations, infos
diff --git a/skrl/envs/wrappers/torch/pettingzoo_envs.py b/skrl/envs/wrappers/torch/pettingzoo_envs.py
index 08348f15..7b55785c 100644
--- a/skrl/envs/wrappers/torch/pettingzoo_envs.py
+++ b/skrl/envs/wrappers/torch/pettingzoo_envs.py
@@ -1,9 +1,7 @@
 from typing import Any, Mapping, Tuple
 
 import collections
-import gymnasium
 
-import numpy as np
 import torch
 
 from skrl.envs.wrappers.torch.base import MultiAgentEnvWrapper