diff --git a/Dockerfile b/Dockerfile
index 374332e..3d07c78 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,7 +29,7 @@ RUN \
     /root-out/var/log/*
 
 # set version for s6 overlay
-ARG S6_OVERLAY_VERSION="3.1.5.0"
+ARG S6_OVERLAY_VERSION="3.1.6.2"
 ARG S6_OVERLAY_ARCH="x86_64"
 
 # add s6 overlay
@@ -108,6 +108,7 @@ RUN \
     > /run/systemd/container && \
   echo "**** install apt-utils and locales ****" && \
   apt-get update && \
+  apt-get upgrade -y && \
   apt-get install -y \
     apt-utils \
     locales && \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 032f565..04343d0 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -29,7 +29,7 @@ RUN \
     /root-out/var/log/*
 
 # set version for s6 overlay
-ARG S6_OVERLAY_VERSION="3.1.5.0"
+ARG S6_OVERLAY_VERSION="3.1.6.2"
 ARG S6_OVERLAY_ARCH="aarch64"
 
 # add s6 overlay
@@ -108,6 +108,7 @@ RUN \
     > /run/systemd/container && \
   echo "**** install apt-utils and locales ****" && \
   apt-get update && \
+  apt-get upgrade -y && \
   apt-get install -y \
     apt-utils \
     locales && \
@@ -117,7 +118,7 @@ RUN \
     curl \
     gnupg \
     jq \
-    netcat-openbsd \ 
+    netcat-openbsd \
     tzdata && \
   echo "**** generate locale ****" && \
   locale-gen en_US.UTF-8 && \