diff --git a/examples/trade/requirements.txt b/examples/trade/requirements.txt
index ce27c2306..19e34cbb7 100644
--- a/examples/trade/requirements.txt
+++ b/examples/trade/requirements.txt
@@ -1,10 +1,10 @@
-tianshou==0.3.0.post1
+gym==0.17.3
 torch==1.6.0
 numba==0.51.2
+numpy==1.19.1
 pandas==1.1.3
 tqdm==4.50.2
-numpy==1.19.1
-gym==0.17.3
+tianshou==0.3.0.post1
 env==0.1.0
 PyYAML==5.4.1
 redis==3.5.3