diff --git a/Dockerfile b/Dockerfile
index 6e9618a..1905ae8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,6 +16,7 @@ ADD ./fonts/SourceHanSansCN-Light.otf /usr/share/fonts/SourceHanSansCN-Light.otf
 ADD ./fonts/SourceHanSerifCN-Regular.otf /usr/share/fonts/SourceHanSerifCN-Regular.otf
 ADD ./fonts/SourceHanSansCN-Regular.otf /usr/share/fonts/SourceHanSansCN-Regular.otf
 
-RUN apt-get install -y nano net-tools 
+RUN apt-get install -y nano net-tools ca-certificates
+