diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a1cfff5..1a6db60 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -17,5 +17,5 @@ jobs:
     with:
       DOCKER_REPOSITORY_NAME: rubensa
       DOCKER_IMAGE_NAME: ubuntu-tini
-      DOCKER_IMAGE_TAG: latest
+      DOCKER_IMAGE_TAG: 18.04
     secrets: inherit
diff --git a/Dockerfile b/Dockerfile
index 203d27c..819915c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,6 @@
 # syntax=docker/dockerfile:1.4
-FROM ubuntu
+# Ubuntu 18.04 LTS (Bionic Beaver) Release Build
+FROM ubuntu:bionic
 LABEL author="Ruben Suarez <rubensa@gmail.com>"
 
 # Architecture component of TARGETPLATFORM (platform of the build result)
diff --git a/README.md b/README.md
index 21a1981..5d4a4aa 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Docker image based on ubuntu and running tini init system
+# Docker image based on ubuntu 18.04 and running tini init system
 
 This is a Docker image based on [ubuntu](https://hub.docker.com/_/ubuntu/) running [tini](https://github.com/krallin/tini) init system inside a container.
 
@@ -11,7 +11,7 @@ You can build the image like this:
 
 DOCKER_REPOSITORY_NAME="rubensa"
 DOCKER_IMAGE_NAME="ubuntu-tini"
-DOCKER_IMAGE_TAG="latest"
+DOCKER_IMAGE_TAG="18.04"
 
 docker buildx build --platform=linux/amd64,linux/arm64 --no-cache \
   -t "${DOCKER_REPOSITORY_NAME}/${DOCKER_IMAGE_NAME}:${DOCKER_IMAGE_TAG}" \
@@ -32,7 +32,7 @@ You can run the container like this (change --rm with -d if you don't want the c
 
 DOCKER_REPOSITORY_NAME="rubensa"
 DOCKER_IMAGE_NAME="ubuntu-tini"
-DOCKER_IMAGE_TAG="latest"
+DOCKER_IMAGE_TAG="18.04"
 
 prepare_docker_timezone() {
   # https://www.waysquare.com/how-to-change-docker-timezone/
diff --git a/build.sh b/build.sh
index a786e09..af8c5e8 100755
--- a/build.sh
+++ b/build.sh
@@ -2,7 +2,7 @@
 
 DOCKER_REPOSITORY_NAME="rubensa"
 DOCKER_IMAGE_NAME="ubuntu-tini"
-DOCKER_IMAGE_TAG="latest"
+DOCKER_IMAGE_TAG="18.04"
 
 # see: https://github.com/docker/buildx/issues/495#issuecomment-761562905
 #docker buildx build --platform=linux/amd64,linux/arm64 --no-cache --progress=plain --pull \
diff --git a/run.sh b/run.sh
index 42d5e3a..b0a1ded 100755
--- a/run.sh
+++ b/run.sh
@@ -2,7 +2,7 @@
 
 DOCKER_REPOSITORY_NAME="rubensa"
 DOCKER_IMAGE_NAME="ubuntu-tini"
-DOCKER_IMAGE_TAG="latest"
+DOCKER_IMAGE_TAG="18.04"
 
 prepare_docker_timezone() {
   # https://www.waysquare.com/how-to-change-docker-timezone/