diff --git a/4.4/docker-entrypoint.sh b/4.4/docker-entrypoint.sh
index 9246798..4f50c3f 100755
--- a/4.4/docker-entrypoint.sh
+++ b/4.4/docker-entrypoint.sh
@@ -2,8 +2,13 @@
 
 set -euo pipefail
 
+: "${RT_ROOT_PASSWORD:=}"
 : "${RT_WEB_PORT:=80}"
 
 sed -i "s/RT_WEB_PORT/$RT_WEB_PORT/" /opt/rt4/etc/RT_SiteConfig.pm
 
+if [[ -n "${RT_ROOT_PASSWORD}" ]]; then
+  (echo "${RT_ROOT_PASSWORD}" | /opt/rt4/sbin/rt-passwd root) || [[ $? -gt 1 ]] && exit 1
+fi
+
 exec "$@"
diff --git a/5.0/docker-entrypoint.sh b/5.0/docker-entrypoint.sh
index d438c36..6f76861 100755
--- a/5.0/docker-entrypoint.sh
+++ b/5.0/docker-entrypoint.sh
@@ -2,8 +2,13 @@
 
 set -euo pipefail
 
+: "${RT_ROOT_PASSWORD:=}"
 : "${RT_WEB_PORT:=80}"
 
 sed -i "s/RT_WEB_PORT/$RT_WEB_PORT/" /opt/rt5/etc/RT_SiteConfig.pm
 
+if [[ -n "${RT_ROOT_PASSWORD}" ]]; then
+  (echo "${RT_ROOT_PASSWORD}" | /opt/rt5/sbin/rt-passwd root) || [[ $? -gt 1 ]] && exit 1
+fi
+
 exec "$@"
diff --git a/README.md b/README.md
index 5367187..b2eb441 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,13 @@ docker run -d --name rt -p 8080:8080 -e RT_WEB_PORT=8080 ghcr.io/netsandbox/requ
 
 Then, access it via `http://localhost:8080` or `http://host-ip:8080` in a browser.
 
+### Environment Variables
+
+| Environment Variable | Description |
+| --- | --- |
+| `RT_ROOT_PASSWORD` | RT root user password |
+| `RT_WEB_PORT` | RT [WebPort](https://docs.bestpractical.com/rt/latest/RT_Config.html#WebPort) |
+
 ## RT Extension Testing
 
 You can use these Docker images to test your RT Extensions.
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 1b585a6..0b54bcc 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -2,8 +2,13 @@
 
 set -euo pipefail
 
+: "${RT_ROOT_PASSWORD:=}"
 : "${RT_WEB_PORT:=80}"
 
 sed -i "s/RT_WEB_PORT/$RT_WEB_PORT/" /opt/rt%%RT_VERSION_MAJOR%%/etc/RT_SiteConfig.pm
 
+if [[ -n "${RT_ROOT_PASSWORD}" ]]; then
+  (echo "${RT_ROOT_PASSWORD}" | /opt/rt%%RT_VERSION_MAJOR%%/sbin/rt-passwd root) || [[ $? -gt 1 ]] && exit 1
+fi
+
 exec "$@"