diff --git a/Dockerfile b/Dockerfile
index 01bc180..a957a5c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -36,7 +36,7 @@ RUN \
   sed -i -e 's/^root::/root:!:/' /root-out/etc/shadow
 
 # set version for s6 overlay
-ARG S6_OVERLAY_VERSION="3.1.2.0"
+ARG S6_OVERLAY_VERSION="3.1.2.1"
 ARG S6_OVERLAY_ARCH="x86_64"
 
 # add s6 overlay
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 0768842..6ef78f2 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -36,7 +36,7 @@ RUN \
   sed -i -e 's/^root::/root:!:/' /root-out/etc/shadow
 
 # set version for s6 overlay
-ARG S6_OVERLAY_VERSION="3.1.2.0"
+ARG S6_OVERLAY_VERSION="3.1.2.1"
 ARG S6_OVERLAY_ARCH="aarch64"
 
 # add s6 overlay
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index cd5fdab..46aff45 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -36,7 +36,7 @@ RUN \
   sed -i -e 's/^root::/root:!:/' /root-out/etc/shadow
 
 # set version for s6 overlay
-ARG S6_OVERLAY_VERSION="3.1.2.0"
+ARG S6_OVERLAY_VERSION="3.1.2.1"
 ARG S6_OVERLAY_ARCH="armhf"
 
 # add s6 overlay
diff --git a/root/etc/s6-overlay/s6-rc.d/init-script-check/run b/root/etc/s6-overlay/s6-rc.d/init-script-check/run
index dc2ee8b..74b73e7 100755
--- a/root/etc/s6-overlay/s6-rc.d/init-script-check/run
+++ b/root/etc/s6-overlay/s6-rc.d/init-script-check/run
@@ -3,7 +3,7 @@
 
 if [[ -n "$(/bin/ls -A "/config/custom-cont-init.d" 2>/dev/null)" ]] ||
     [[ -n "$(/bin/ls -A "/config/custom-services.d" 2>/dev/null)" ]]; then
-    cat <<-EOF | tee /config/custom-cont-init.d/README.txt,/config/custom-services.d/README.txt 2>/dev/null
+    cat << EOF | tee {/config/custom-cont-init.d/README.txt,/config/custom-services.d/README.txt} 2>/dev/null
     ********************************************************
     ********************************************************
     *                                                      *