diff --git a/Dockerfile b/Dockerfile
index d22fb7e..5bed6c0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,8 @@
-FROM debian:wheezy-slim
+FROM debian:stretch-slim
 
+RUN apt-get update && apt-get install gnupg -y
 RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 8756C4F765C9AC3CB6B85D62379CE192D401AB61 && \
-    echo deb http://deb.seadrive.org wheezy main | tee /etc/apt/sources.list.d/seafile.list && \
+    echo deb http://deb.seadrive.org stretch main | tee /etc/apt/sources.list.d/seafile.list && \
     apt-get update -y && \
     apt-get install -y seafile-cli procps curl grep && \
     rm -rf /var/lib/apt/lists/*