diff --git a/CHANGELOG.md b/CHANGELOG.md
index 49a3b2e..3496f56 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 # Container image version
 # Note: the version here is from `ELABIMG_VERSION` present in Dockerfile, not the tagged one
 
+# 5.3.0
+
+* Update s6-overlay to 3.2.0.0
+* Move `MAX_UPLOAD_SIZE` and `MAX_UPLOAD_TIME` into PHP env instead of build args
+
 # 5.2.0
 
 * Update base image to Alpine 3.19
diff --git a/Dockerfile b/Dockerfile
index df224b2..6fd9df9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -151,7 +151,7 @@ RUN abuild && find /home/builder/packages -type f -name 'cronie-1*.apk' -exec mv
 FROM alpine:3.19
 
 # this is versioning for the container image
-ENV ELABIMG_VERSION=5.2.0
+ENV ELABIMG_VERSION=5.3.0
 
 # the target elabftw version is passed with --build-arg
 # it is a mandatory ARG
@@ -236,7 +236,7 @@ RUN ln /usr/bin/php83 /usr/bin/php
 # S6-OVERLAY
 # install s6-overlay, our init system. Workaround for different versions using TARGETPLATFORM
 # platform see https://docs.docker.com/engine/reference/builder/#automatic-platform-args-in-the-global-scope
-ARG S6_OVERLAY_VERSION=3.1.2.0
+ARG S6_OVERLAY_VERSION=3.2.0.0
 ENV S6_OVERLAY_VERSION=$S6_OVERLAY_VERSION
 
 # using an explicit default argument for TARGETPLATFORM will override the buildx implicit value