diff --git a/Dockerfile b/Dockerfile
index cf41106..9090f79 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -48,7 +48,7 @@ RUN export http_proxy=${PROXY} && \
     export https_proxy=${PROXY} && \
     apt update && \
     apt install -y software-properties-common && \
-    add-apt-repository ppa:deadsnakes/ppa && \
+    add-apt-repository -y ppa:deadsnakes/ppa && \
     apt install -y python3.8
 
 # 安装 docker 环境