diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 5c1db49f..5ad0c837 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -59,8 +59,8 @@ jobs:
         # To use C++17 features
         # https://cibuildwheel.readthedocs.io/en/stable/cpp_standards/#manylinux1-and-c14
         MACOSX_DEPLOYMENT_TARGET: "10.15"  # <filesystem> requires 10.15
-        CIBW_BUILD: cp39-*  # cp37-* cp38-* cp39-* importlib.resources requires >= 3.7 
-        CIBW_SKIP: pp* cp27-win* cp35-* cp36-* cp37-* cp38-* *win*
+        CIBW_BUILD: cp39-* cp37-* cp38-*   # cp37-* cp38-* cp39-* importlib.resources requires >= 3.7 
+        CIBW_SKIP: pp* cp27-win* cp35-* cp36-* *win*
         # https://cibuildwheel.readthedocs.io/en/stable/options/#archs
         # universal2 arch raises this error:
         # CMake Error at mjx/external/grpc-src/third_party/boringssl-with-bazel/CMakeLists.txt:52 (message): Universal binaries not supported.
diff --git a/README.md b/README.md
index 2c29e799..1b786278 100644
--- a/README.md
+++ b/README.md
@@ -16,17 +16,15 @@
 
 ```py
 from mjx import MjxEnv
-from mjx.agent import RandomAgent
+from mjx.agents import RandomAgent
 
 agent = RandomAgent()
 env = MjxEnv()
-player_id, observation = env.reset()
+obs_dict = env.reset()
 while not env.done():
-    action = agent.act(observation)
-    player_id, observation = env.step(action)
-rewards = env.rewards()
+    actions = {player_id: agent.act(obs)
+            for player_id, obs in obs_dict.items()}
+    obs_dict = env.step(actions)
+returns = env.rewards()
 ```
 
-## Visualization
-
-Available at https://mjx-visualizer.an.r.appspot.com/
diff --git a/setup.py b/setup.py
index f4ad5ed3..3c5e7a44 100644
--- a/setup.py
+++ b/setup.py
@@ -137,7 +137,7 @@ def build_extension(self, ext):
 # logic and declaration, and simpler if you include description/version in a file.
 setup(
     name="mjx",
-    version="0.0.8",
+    version="0.0.9",
     author="Mjx Project Team",
     author_email="koyamada-s@sys.i.kyoto-u.ac.jp",
     description="",