diff --git a/Dockerfile b/Dockerfile
index 0abc3e0a..f1ff40e6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,10 @@ ENV HOME="/root"
 ENV TERM="xterm"
 
 # set version for s6 overlay
-ARG OVERLAY_VERSION="v1.18.1.0"
+ARG OVERLAY_VERSION="v1.18.1.3"
+ARG OVERLAY_ARCH="amd64"
+ARG OVERLAY_URL="https://github.com/just-containers/s6-overlay/releases/download"
+ARG OVERLAY_WWW="${OVERLAY_URL}"/"${OVERLAY_VERSION}"/s6-overlay-"${OVERLAY_ARCH}".tar.gz
 
 # create abc user and make folders
 RUN \
@@ -28,10 +31,9 @@ RUN \
 
 # add s6 overlay
  curl -o \
-	/tmp/s6-overlay.tar.gz -L \
-	https://github.com/just-containers/s6-overlay/releases/download/"${OVERLAY_VERSION}"/s6-overlay-amd64.tar.gz && \
- tar xvfz \
-	/tmp/s6-overlay.tar.gz -C / && \
+ /tmp/s6-overlay.tar.gz -L \
+	"${OVERLAY_WWW}" && \
+ tar xvfz /tmp/s6-overlay.tar.gz -C / && \
 
 # cleanup
  apt-get clean && \