diff --git a/sota-implementations/multiagent/qmix_vdn.py b/sota-implementations/multiagent/qmix_vdn.py
index a6e24cf9414..1bcc2dbd10e 100644
--- a/sota-implementations/multiagent/qmix_vdn.py
+++ b/sota-implementations/multiagent/qmix_vdn.py
@@ -110,7 +110,7 @@ def train(cfg: "DictConfig"):  # noqa: F821
     if cfg.loss.mixer_type == "qmix":
         mixer = TensorDictModule(
             module=QMixer(
-                state_shape=env.unbatched_observation_spec[
+                state_shape=env.observation_spec_unbatched[
                     "agents", "observation"
                 ].shape,
                 mixing_embed_dim=32,
diff --git a/torchrl/envs/libs/vmas.py b/torchrl/envs/libs/vmas.py
index 8d2e3387e3c..140fb191cae 100644
--- a/torchrl/envs/libs/vmas.py
+++ b/torchrl/envs/libs/vmas.py
@@ -5,6 +5,7 @@
 from __future__ import annotations
 
 import importlib.util
+import warnings
 
 from typing import Dict, List, Optional, Union
 
@@ -328,9 +329,9 @@ def _make_specs(
             self.group_map = self.group_map.get_group_map(self.agent_names)
         check_marl_grouping(self.group_map, self.agent_names)
 
-        self.unbatched_action_spec = Composite(device=self.device)
-        self.unbatched_observation_spec = Composite(device=self.device)
-        self.unbatched_reward_spec = Composite(device=self.device)
+        full_action_spec_unbatched = Composite(device=self.device)
+        full_observation_spec_unbatched = Composite(device=self.device)
+        full_reward_spec_unbatched = Composite(device=self.device)
 
         self.het_specs = False
         self.het_specs_map = {}
@@ -341,18 +342,18 @@ def _make_specs(
                 group_reward_spec,
                 group_info_spec,
             ) = self._make_unbatched_group_specs(group)
-            self.unbatched_action_spec[group] = group_action_spec
-            self.unbatched_observation_spec[group] = group_observation_spec
-            self.unbatched_reward_spec[group] = group_reward_spec
+            full_action_spec_unbatched[group] = group_action_spec
+            full_observation_spec_unbatched[group] = group_observation_spec
+            full_reward_spec_unbatched[group] = group_reward_spec
             if group_info_spec is not None:
-                self.unbatched_observation_spec[(group, "info")] = group_info_spec
+                full_observation_spec_unbatched[(group, "info")] = group_info_spec
             group_het_specs = isinstance(
                 group_observation_spec, StackedComposite
             ) or isinstance(group_action_spec, StackedComposite)
             self.het_specs_map[group] = group_het_specs
             self.het_specs = self.het_specs or group_het_specs
 
-        self.unbatched_done_spec = Composite(
+        full_done_spec_unbatched = Composite(
             {
                 "done": Categorical(
                     n=2,
@@ -363,18 +364,42 @@ def _make_specs(
             },
         )
 
-        self.action_spec = self.unbatched_action_spec.expand(
-            *self.batch_size, *self.unbatched_action_spec.shape
+        self.full_action_spec_unbatched = full_action_spec_unbatched
+        self.full_observation_spec_unbatched = full_observation_spec_unbatched
+        self.full_reward_spec_unbatched = full_reward_spec_unbatched
+        self.full_done_spec_unbatched = full_done_spec_unbatched
+
+    @property
+    def unbatched_action_spec(self):
+        warnings.warn(
+            "unbatched_action_spec is deprecated and will be removed in v0.9. "
+            "Please use full_action_spec_unbatched instead."
         )
-        self.observation_spec = self.unbatched_observation_spec.expand(
-            *self.batch_size, *self.unbatched_observation_spec.shape
+        return self.full_action_spec_unbatched
+
+    @property
+    def unbatched_observation_spec(self):
+        warnings.warn(
+            "unbatched_observation_spec is deprecated and will be removed in v0.9. "
+            "Please use full_observation_spec_unbatched instead."
         )
-        self.reward_spec = self.unbatched_reward_spec.expand(
-            *self.batch_size, *self.unbatched_reward_spec.shape
+        return self.full_observation_spec_unbatched
+
+    @property
+    def unbatched_reward_spec(self):
+        warnings.warn(
+            "unbatched_reward_spec is deprecated and will be removed in v0.9. "
+            "Please use full_reward_spec_unbatched instead."
         )
-        self.done_spec = self.unbatched_done_spec.expand(
-            *self.batch_size, *self.unbatched_done_spec.shape
+        return self.full_reward_spec_unbatched
+
+    @property
+    def unbatched_done_spec(self):
+        warnings.warn(
+            "unbatched_done_spec is deprecated and will be removed in v0.9. "
+            "Please use full_done_spec_unbatched instead."
         )
+        return self.full_done_spec_unbatched
 
     def _make_unbatched_group_specs(self, group: str):
         # Agent specs
@@ -618,7 +643,9 @@ def read_reward(self, rewards):
 
     def read_action(self, action, group: str = "agents"):
         if not self.continuous_actions and not self.categorical_actions:
-            action = self.unbatched_action_spec[group, "action"].to_categorical(action)
+            action = self.full_action_spec_unbatched[group, "action"].to_categorical(
+                action
+            )
         agent_actions = action.unbind(dim=1)
         return agent_actions