diff --git a/Dockerfile b/Dockerfile
index 9090f79..e614f3f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -46,10 +46,9 @@ RUN export http_proxy=${PROXY} && \
 # 安装 python 环境
 RUN export http_proxy=${PROXY} && \
     export https_proxy=${PROXY} && \
-    apt update && \
-    apt install -y software-properties-common && \
-    add-apt-repository -y ppa:deadsnakes/ppa && \
-    apt install -y python3.8
+    apt-get update && \
+    apt-get install --no-install-recommends -y python3.9 python3.9-dev python3.9-venv python3-pip python3-wheel build-essential && \
+    apt-get clean
 
 # 安装 docker 环境
 RUN export http_proxy=${PROXY} && \