diff --git a/Dockerfile b/Dockerfile
index c17c0e0..e4c3874 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -101,7 +101,7 @@ RUN \
     > /run/systemd/container && \
   echo "**** install apt-utils and locales ****" && \
   apt-get update && \
-  apt-get upgrade && \
+  apt-get upgrade -y && \
   apt-get install -y \
     apt-utils \
     locales && \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index ee19e0b..0080b92 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -101,7 +101,7 @@ RUN \
     > /run/systemd/container && \
   echo "**** install apt-utils and locales ****" && \
   apt-get update && \
-  apt-get upgrade && \
+  apt-get upgrade -y && \
   apt-get install -y \
     apt-utils \
     locales && \