diff --git a/.github/unittest/linux/scripts/environment.yml b/.github/unittest/linux/scripts/environment.yml
index 38d95eb335..8b512526a0 100644
--- a/.github/unittest/linux/scripts/environment.yml
+++ b/.github/unittest/linux/scripts/environment.yml
@@ -34,3 +34,5 @@ dependencies:
     - transformers
     - ninja
     - timm
+    - gymnasium[atari,accept-rom-license]
+    - mo-gymnasium[mujoco]
diff --git a/.github/unittest/linux/scripts/run_all.sh b/.github/unittest/linux/scripts/run_all.sh
index 1026b31cf0..dec06bd2d8 100755
--- a/.github/unittest/linux/scripts/run_all.sh
+++ b/.github/unittest/linux/scripts/run_all.sh
@@ -87,11 +87,6 @@ conda env update --file "${this_dir}/environment.yml" --prune
 conda deactivate
 conda activate "${env_dir}"
 
-echo "installing gymnasium"
-pip3 install "gymnasium[atari,accept-rom-license]"
-pip3 install mo-gymnasium[mujoco]  # requires here bc needs mujoco-py
-pip3 install "mujoco" -U
-
 # sanity check: remove?
 python3 -c """
 import dm_control
diff --git a/torchrl/modules/distributions/discrete.py b/torchrl/modules/distributions/discrete.py
index c48d816888..d2ffba3068 100644
--- a/torchrl/modules/distributions/discrete.py
+++ b/torchrl/modules/distributions/discrete.py
@@ -389,6 +389,17 @@ def sample(
     ) -> torch.Tensor:
         ...
 
+    @property
+    def deterministic_sample(self):
+        return self.mode
+
+    @property
+    def mode(self) -> torch.Tensor:
+        if hasattr(self, "logits"):
+            return (self.logits == self.logits.max(-1, True)[0]).to(torch.long)
+        else:
+            return (self.probs == self.probs.max(-1, True)[0]).to(torch.long)
+
     def log_prob(self, value: torch.Tensor) -> torch.Tensor:
         return super().log_prob(value.argmax(dim=-1))