diff --git a/Dockerfile b/Dockerfile
index 2e21614..1330d93 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM ghcr.io/catthehacker/ubuntu:gh-20.04
 USER root
 
 RUN apt-get update
-RUN apt-get upgrade
+RUN apt-get upgrade -y
 RUN apt-get install pandoc nodejs texlive-full -y
 RUN apt-get clean
 RUN rm -rf /var/lib/apt/lists/*