diff --git a/PyTorch/built-in/rl/PPO_for_Pytorch/README.md b/PyTorch/built-in/rl/PPO_for_Pytorch/README.md
index 0b2b9701fcd54495250565a0b934af1b654a19cf..2ecfd6b742c160049741a86abcaa4e7ffc2f5fc9 100644
--- a/PyTorch/built-in/rl/PPO_for_Pytorch/README.md
+++ b/PyTorch/built-in/rl/PPO_for_Pytorch/README.md
@@ -80,7 +80,8 @@
 
   在模型根目录下执行命令，安装模型对应PyTorch版本需要的依赖。
   ```shell
-  pip install -r requirements.txt  
+  pip install -r requirements.txt
+  pip install gym[box2d]==0.15.4
   ```
 
 
diff --git a/PyTorch/built-in/rl/PPO_for_Pytorch/requirements.txt b/PyTorch/built-in/rl/PPO_for_Pytorch/requirements.txt
index 3e2f4fd906050fc01612c05df65561903a3d681d..d74ca398c084489564411d65f5490cc0cc25756b 100644
--- a/PyTorch/built-in/rl/PPO_for_Pytorch/requirements.txt
+++ b/PyTorch/built-in/rl/PPO_for_Pytorch/requirements.txt
@@ -1,4 +1,3 @@
-Box2D==2.3.2
-Box2D-kengz==2.3.3
-gym==0.15.4
+box2d==2.3.2
+box2d-kengz==2.3.3
 sympy
\ No newline at end of file