diff --git a/CHANGELOG.md b/CHANGELOG.md
index e86fb56..a79e835 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/) and [Keep a changelog](https://github.com/olivierlacan/keep-a-changelog).
 
 ## [Unreleased](https://github.com/idealista/prom2teams/tree/develop)
+## [4.2.1](https://github.com/idealista/prom2teams/tree/4.2.1)
+[Full Changelog](https://github.com/idealista/prom2teams/compare/4.2.0...4.2.1)
+### Fixed
+- *[#307](https://github.com/idealista/prom2teams/pull/307) Update prom2teams replace_config with tmp config files* @santi-eidu
 ## [4.2.0](https://github.com/idealista/prom2teams/tree/4.2.0)
 [Full Changelog](https://github.com/idealista/prom2teams/compare/4.1.0...4.2.0)
 ### Added
diff --git a/docker/rootfs/config.ini b/docker/rootfs/config.ini.tmp
similarity index 100%
rename from docker/rootfs/config.ini
rename to docker/rootfs/config.ini.tmp
diff --git a/docker/rootfs/prom2teams_start.sh b/docker/rootfs/prom2teams_start.sh
index f68c534..6ae4230 100644
--- a/docker/rootfs/prom2teams_start.sh
+++ b/docker/rootfs/prom2teams_start.sh
@@ -1,3 +1,12 @@
 #!/bin/sh
 python /opt/prom2teams/replace_config.py
-uwsgi /opt/prom2teams/uwsgi.ini
\ No newline at end of file
+
+if [ ! -f "/opt/prom2teams/config.ini" ]; then
+    mv /opt/prom2teams/config.ini.tmp /opt/prom2teams/config.ini
+fi
+
+if [ ! -f "/opt/prom2teams/uwsgi.ini" ]; then
+    mv /opt/prom2teams/uwsgi.ini.tmp /opt/prom2teams/uwsgi.ini
+fi
+
+uwsgi /opt/prom2teams/uwsgi.ini
diff --git a/docker/rootfs/replace_config.py b/docker/rootfs/replace_config.py
index 3bf545e..3866818 100644
--- a/docker/rootfs/replace_config.py
+++ b/docker/rootfs/replace_config.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 import os
 
-with open('/opt/prom2teams/config.ini', 'r') as file:
+with open('/opt/prom2teams/config.ini.tmp', 'r') as file:
   filedata = file.read()
 
 filedata = filedata.replace("prom2teamsport", os.environ.get("PROM2TEAMS_PORT"))
@@ -10,10 +10,11 @@
 filedata = filedata.replace("prom2teamsgroupalertsby", os.environ.get("PROM2TEAMS_GROUP_ALERTS_BY"))
 filedata = filedata.replace("prom2teamslogslevel", os.environ.get("PROM2TEAMS_LOGLEVEL"))
 
-with open('/opt/prom2teams/config.ini', 'w') as file:
+
+with open('/opt/prom2teams/config.ini.tmp', 'w') as file:
   file.write(filedata)
 
-with open('/opt/prom2teams/uwsgi.ini', 'r') as file:
+with open('/opt/prom2teams/uwsgi.ini.tmp', 'r') as file:
   uwsgi_filedata = file.read()
 
 uwsgi_filedata = uwsgi_filedata.replace("uwsgiprocesses", os.environ.get("UWSGI_PROCESSES"))
@@ -22,6 +23,5 @@
 uwsgi_filedata = uwsgi_filedata.replace("uwsgihost", os.environ.get("UWSGI_HOST"))
 uwsgi_filedata = uwsgi_filedata.replace("uwsgiprotocol", os.environ.get("UWSGI_PROTOCOL"))
 
-
-with open('/opt/prom2teams/uwsgi.ini', 'w') as file:
+with open('/opt/prom2teams/uwsgi.ini.tmp', 'w') as file:
   file.write(uwsgi_filedata)
diff --git a/docker/rootfs/uwsgi.ini b/docker/rootfs/uwsgi.ini.tmp
similarity index 100%
rename from docker/rootfs/uwsgi.ini
rename to docker/rootfs/uwsgi.ini.tmp