diff --git a/moojoco/environment/dual.py b/moojoco/environment/dual.py
index 6949ccb..d65a960 100644
--- a/moojoco/environment/dual.py
+++ b/moojoco/environment/dual.py
@@ -63,12 +63,12 @@ def observation_space(self) -> SpaceType:
     def step(
         self, state: BaseEnvState, action: chex.Array, *args, **kwargs
     ) -> BaseEnvState:
-        return self._env.step(state=state, action=action, *args, **kwargs)
+        return self._env.step(state, action, *args, **kwargs)
 
     def reset(
         self, rng: np.random.RandomState | chex.PRNGKey, *args, **kwargs
     ) -> BaseEnvState:
-        return self._env.reset(rng=rng, *args, **kwargs)
+        return self._env.reset(rng, *args, **kwargs)
 
     def render(self, state: BaseEnvState) -> List[RenderFrame] | None:
         return self._env.render(state=state)
diff --git a/moojoco/environment/mjc_env.py b/moojoco/environment/mjc_env.py
index 7c2a889..1f5fb03 100644
--- a/moojoco/environment/mjc_env.py
+++ b/moojoco/environment/mjc_env.py
@@ -265,7 +265,7 @@ def step(
     ) -> VectorMJCEnvState:
         self._states = list(
             self._pool.map(
-                lambda env, ste, act: env.step(state=ste, action=act, *args, **kwargs),
+                lambda env, ste, act: env.step(ste, act, *args, **kwargs),
                 self._envs,
                 self._states,
                 action,
diff --git a/moojoco/environment/wrapper.py b/moojoco/environment/wrapper.py
index defb170..7c6d4ff 100644
--- a/moojoco/environment/wrapper.py
+++ b/moojoco/environment/wrapper.py
@@ -53,12 +53,12 @@ def observation_space(self) -> SpaceType:
     def step(
         self, state: BaseEnvState, action: chex.Array, *args, **kwargs
     ) -> BaseEnvState:
-        return self._env.step(state=state, action=action, *args, **kwargs)
+        return self._env.step(state, action, *args, **kwargs)
 
     def reset(
         self, rng: np.random.RandomState | chex.PRNGKey, *args, **kwargs
     ) -> BaseEnvState:
-        return self._env.reset(rng=rng, *args, **kwargs)
+        return self._env.reset(rng, *args, **kwargs)
 
     def render(self, state: BaseEnvState) -> List[RenderFrame] | None:
         return self._env.render(state=state)
@@ -83,14 +83,14 @@ def _transform_observations(self, state: BaseEnvState) -> BaseEnvState:
     def step(
         self, state: BaseEnvState, action: chex.Array, *args, **kwargs
     ) -> BaseEnvState:
-        state = self._env.step(state=state, action=action, *args, **kwargs)
+        state = self._env.step(state, action, *args, **kwargs)
         state = self._transform_observations(state=state)
         return state
 
     def reset(
         self, rng: np.random.RandomState | chex.PRNGKey, *args, **kwargs
     ) -> BaseEnvState:
-        state = self._env.reset(rng=rng, *args, **kwargs)
+        state = self._env.reset(rng, *args, **kwargs)
         state = self._transform_observations(state=state)
         return state
 
@@ -114,5 +114,5 @@ def step(
         self, state: BaseEnvState, action: chex.Array, *args, **kwargs
     ) -> BaseEnvState:
         action, state = self._transform_action(action=action, state=state)
-        state = self._env.step(state=state, action=action, *args, **kwargs)
+        state = self._env.step(state, action, *args, **kwargs)
         return state