diff --git a/README.md b/README.md
index 16c8ca2..74713c1 100644
--- a/README.md
+++ b/README.md
@@ -78,7 +78,7 @@ To install Crafter, run `pip3 install crafter`. The environment follows the
 outputs are one of 17 categorical actions.
 
 ```py
-import gym
+import gymnasium as gym
 import crafter
 
 env = gym.make('CrafterReward-v1')  # Or CrafterNoReward-v1
@@ -93,7 +93,7 @@ obs = env.reset()
 done = False
 while not done:
   action = env.action_space.sample()
-  obs, reward, done, info = env.step(action)
+  obs, reward, terminated, truncated, info = env.step(action)
 ```
 
 [gym]: https://github.com/openai/gym
diff --git a/crafter/__init__.py b/crafter/__init__.py
index caa8a0d..e42bc40 100644
--- a/crafter/__init__.py
+++ b/crafter/__init__.py
@@ -2,7 +2,7 @@
 from .recorder import Recorder
 
 try:
-  import gym
+  import gymnasium as gym
   gym.register(
       id='CrafterReward-v1',
       entry_point='crafter:Env',
diff --git a/crafter/env.py b/crafter/env.py
index e0d8e7b..5fab058 100644
--- a/crafter/env.py
+++ b/crafter/env.py
@@ -10,7 +10,7 @@
 
 # Gym is an optional dependency.
 try:
-  import gym
+  import gymnasium as gym
   DiscreteSpace = gym.spaces.Discrete
   BoxSpace = gym.spaces.Box
   DictSpace = gym.spaces.Dict
@@ -36,7 +36,6 @@ def __init__(
     self._reward = reward
     self._length = length
     self._seed = seed
-    self._episode = 0
     self._world = engine.World(area, constants.materials, (12, 12))
     self._textures = engine.Textures(constants.root / 'assets')
     item_rows = int(np.ceil(len(constants.items) / view[0]))
@@ -67,18 +66,22 @@ def action_space(self):
   def action_names(self):
     return constants.actions
 
-  def reset(self):
+  def reset(self, seed=None, options={}):
     center = (self._world.area[0] // 2, self._world.area[1] // 2)
-    self._episode += 1
     self._step = 0
-    self._world.reset(seed=hash((self._seed, self._episode)) % (2 ** 31 - 1))
+    if not seed:
+      seed = self._seed
+    if not seed:
+      seed = 0
+    self._world.reset(seed=seed)
     self._update_time()
     self._player = objects.Player(self._world, center)
     self._last_health = self._player.health
     self._world.add(self._player)
     self._unlocked = set()
     worldgen.generate_world(self._world, self._player)
-    return self._obs()
+    info = {"options": options}
+    return self._obs(), info
 
   def step(self, action):
     self._step += 1
@@ -115,7 +118,9 @@ def step(self, action):
     }
     if not self._reward:
       reward = 0.0
-    return obs, reward, done, info
+    terminated = done
+    truncated = False
+    return obs, reward, terminated, truncated, info
 
   def render(self, size=None):
     size = size or self._size
diff --git a/crafter/recorder.py b/crafter/recorder.py
index 76dc6b0..6995d23 100644
--- a/crafter/recorder.py
+++ b/crafter/recorder.py
@@ -5,8 +5,10 @@
 import imageio
 import numpy as np
 
+import gymnasium
 
-class Recorder:
+
+class Recorder(gymnasium.Env):
 
   def __init__(
       self, env, directory, save_stats=True, save_video=True,
@@ -24,6 +26,12 @@ def __getattr__(self, name):
       raise AttributeError(name)
     return getattr(self._env, name)
 
+  def reset(self, seed=None, options={}):
+    return self._env.reset(seed, options)
+
+  def step(self, action):
+    return self._env.step(action)
+
 
 class StatsRecorder:
 
@@ -42,8 +50,8 @@ def __getattr__(self, name):
       raise AttributeError(name)
     return getattr(self._env, name)
 
-  def reset(self):
-    obs = self._env.reset()
+  def reset(self, seed=None, options={}):
+    obs = self._env.reset(seed=seed, options=options)
     self._length = 0
     self._reward = 0
     self._unlocked = None
@@ -51,7 +59,8 @@ def reset(self):
     return obs
 
   def step(self, action):
-    obs, reward, done, info = self._env.step(action)
+    obs, reward, terminated, truncated, info = self._env.step(action)
+    done = terminated or truncated
     self._length += 1
     self._reward += info['reward']
     if done:
@@ -59,7 +68,7 @@ def step(self, action):
       for key, value in info['achievements'].items():
         self._stats[f'achievement_{key}'] = value
       self._save()
-    return obs, reward, done, info
+    return obs, reward, terminated, truncated, info
 
   def _save(self):
     self._file.write(json.dumps(self._stats) + '\n')
@@ -70,7 +79,7 @@ class VideoRecorder:
 
   def __init__(self, env, directory, size=(512, 512)):
     if not hasattr(env, 'episode_name'):
-      env = EpisodeName(env)
+      env = EpisodeName
     self._env = env
     self._directory = pathlib.Path(directory).expanduser()
     self._directory.mkdir(exist_ok=True, parents=True)
@@ -82,17 +91,18 @@ def __getattr__(self, name):
       raise AttributeError(name)
     return getattr(self._env, name)
 
-  def reset(self):
-    obs = self._env.reset()
+  def reset(self, seed=None, options={}):
+    obs = self._env.reset(seed=seed, options=options)
     self._frames = [self._env.render(self._size)]
     return obs
 
   def step(self, action):
-    obs, reward, done, info = self._env.step(action)
+    obs, reward, terminated, truncated, info = self._env.step(action)
+    done = terminated or truncated
     self._frames.append(self._env.render(self._size))
     if done:
       self._save()
-    return obs, reward, done, info
+    return obs, reward, terminated, truncated, info
 
   def _save(self):
     filename = str(self._directory / (self._env.episode_name + '.mp4'))
@@ -103,7 +113,7 @@ class EpisodeRecorder:
 
   def __init__(self, env, directory):
     if not hasattr(env, 'episode_name'):
-      env = EpisodeName(env)
+      env = EpisodeName
     self._env = env
     self._directory = pathlib.Path(directory).expanduser()
     self._directory.mkdir(exist_ok=True, parents=True)
@@ -114,8 +124,8 @@ def __getattr__(self, name):
       raise AttributeError(name)
     return getattr(self._env, name)
 
-  def reset(self):
-    obs = self._env.reset()
+  def reset(self, seed=None, options={}):
+    obs = self._env.reset(seed=seed, options=options)
     self._episode = [{'image': obs}]
     return obs
 
@@ -123,7 +133,8 @@ def step(self, action):
     # Transitions are defined from the environment perspective, meaning that a
     # transition contains the action and the resulting reward and next
     # observation produced by the environment in response to said action.
-    obs, reward, done, info = self._env.step(action)
+    obs, reward, terminated, truncated, info = self._env.step(action)
+    done = terminated or truncated
     transition = {
         'action': action, 'image': obs, 'reward': reward, 'done': done,
     }
@@ -138,7 +149,7 @@ def step(self, action):
     self._episode.append(transition)
     if done:
       self._save()
-    return obs, reward, done, info
+    return obs, reward, terminated, truncated, info
 
   def _save(self):
     filename = str(self._directory / (self._env.episode_name + '.npz'))
@@ -165,20 +176,21 @@ def __getattr__(self, name):
       raise AttributeError(name)
     return getattr(self._env, name)
 
-  def reset(self):
-    obs = self._env.reset()
+  def reset(self, seed=None, options={}):
+    obs = self._env.reset(seed=seed, options=options)
     self._timestamp = None
     self._unlocked = None
     self._length = 0
     return obs
 
   def step(self, action):
-    obs, reward, done, info = self._env.step(action)
+    obs, reward, terminated, truncated, info = self._env.step(action)
+    done = terminated or truncated
     self._length += 1
     if done:
       self._timestamp = datetime.datetime.now().strftime('%Y%m%dT%H%M%S')
       self._unlocked = sum(int(v >= 1) for v in info['achievements'].values())
-    return obs, reward, done, info
+    return obs, reward, terminated, truncated, info
 
   @property
   def episode_name(self):
diff --git a/crafter/run_gui.py b/crafter/run_gui.py
index 06885f9..2e08834 100644
--- a/crafter/run_gui.py
+++ b/crafter/run_gui.py
@@ -60,9 +60,12 @@ def main():
   size[1] = size[1] or args.window[1]
 
   env = crafter.Env(
-      area=args.area, view=args.view, length=args.length, seed=args.seed)
+      area=args.area, view=args.view, length=args.length)
   env = crafter.Recorder(env, args.record)
-  env.reset()
+
+  seed = args.seed
+
+  env.reset(seed=seed)
   achievements = set()
   duration = 0
   return_ = 0
@@ -108,7 +111,8 @@ def main():
           action = 'noop'
 
     # Environment step.
-    _, reward, done, _ = env.step(env.action_names.index(action))
+    _, reward, terminated, truncated, _ = env.step(env.action_names.index(action))
+    done = terminated or truncated
     duration += 1
 
     # Achievements.
@@ -135,7 +139,8 @@ def main():
         running = False
       if args.death == 'reset':
         print('\nStarting a new episode.')
-        env.reset()
+        seed = hash(seed) % (2 ** 31 - 1)
+        env.reset(seed=seed)
         achievements = set()
         was_done = False
         duration = 0
diff --git a/crafter/run_random.py b/crafter/run_random.py
index 8ab1367..9575d87 100644
--- a/crafter/run_random.py
+++ b/crafter/run_random.py
@@ -17,6 +17,8 @@ def main():
   parser.add_argument('--episodes', type=int, default=1)
   args = parser.parse_args()
 
+  seed = args.seed
+
   random = np.random.RandomState(args.seed)
   crafter.constants.items['health']['max'] = args.health
   crafter.constants.items['health']['initial'] = args.health
@@ -26,7 +28,8 @@ def main():
   for _ in range(args.episodes):
 
     start = time.time()
-    obs = env.reset()
+    seed = hash(seed) % (2 ** 31 - 1)
+    obs = env.reset(seed=seed)
     print('')
     print(f'Reset time: {1000*(time.time()-start):.2f}ms')
     print('Coal exist:    ', env._world.count('coal'))
@@ -37,7 +40,8 @@ def main():
     done = False
     while not done:
       action = random.randint(0, env.action_space.n)
-      obs, reward, done, info = env.step(action)
+      obs, reward, terminated, truncated, info = env.step(action)
+      done = terminated or truncated
     duration = time.time() - start
     step = env._step
     print(f'Step time: {1000*duration/step:.2f}ms ({int(step/duration)} FPS)')
diff --git a/crafter/run_terrain.py b/crafter/run_terrain.py
index 009955b..b0f83cf 100644
--- a/crafter/run_terrain.py
+++ b/crafter/run_terrain.py
@@ -16,10 +16,13 @@ def main():
   parser.add_argument('--filename', type=str, default='terrain.png')
   args = parser.parse_args()
 
+  seed = args.seed
+
   env = crafter.Env(args.area, args.area, args.size, seed=args.seed)
   images = []
   for index in range(args.amount):
-    images.append(env.reset())
+    seed = hash(seed) % (2 ** 31 - 1)
+    images.append(env.reset(seed))
     diamonds = env._world.count('diamond')
     print(f'Map: {index:>2}, diamonds: {diamonds:>2}')
 
diff --git a/examples/run_random.py b/examples/run_random.py
index 217a5b5..18cfc75 100644
--- a/examples/run_random.py
+++ b/examples/run_random.py
@@ -6,8 +6,11 @@
 parser = argparse.ArgumentParser()
 parser.add_argument('--outdir', default='logdir/crafter_noreward-random/0')
 parser.add_argument('--steps', type=float, default=1e6)
+parser.add_argument('--seed', type=int, default=None)
 args = parser.parse_args()
 
+seed = args.seed
+
 env = crafter.Env()
 env = crafter.Recorder(
     env, args.outdir,
@@ -22,8 +25,10 @@
 bar = tqdm.tqdm(total=args.steps, smoothing=0)
 while step < args.steps or not done:
   if done:
-    env.reset()
+    seed = hash(seed) % (2 ** 31 - 1)
+    env.reset(seed)
     done = False
-  _, _, done, _ = env.step(action_space.sample())
+  _, _, terminated, truncated, _ = env.step(action_space.sample())
+  done = terminated or truncated
   step += 1
   bar.update(1)
diff --git a/setup.py b/setup.py
index 26c0c63..3b779fb 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
 
 setuptools.setup(
     name='crafter',
-    version='1.8.3',
+    version='1.8.4',
     description='Open world survival game for reinforcement learning.',
     url='http://github.com/danijar/crafter',
     long_description=pathlib.Path('README.md').read_text(),