diff --git a/Dockerfile b/Dockerfile
index d7d6e3ddb428c8f827547abff9380a03f9c879c8..23c8b60314613f48ce032a306a0c5c22a866c4e0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@
 # Author: Frost Ming
 # Author Email: mianghong@gmail.com
 # ---------------------------------
-FROM python:3.7-slim
+FROM python:3.9-slim
 
 RUN python -m pip install -U pdm