diff --git a/check-health.d/state.rsc b/check-health.d/state.rsc
index 0728b45e..9b3a07a7 100644
--- a/check-health.d/state.rsc
+++ b/check-health.d/state.rsc
@@ -3,7 +3,7 @@
 # Copyright (c) 2019-2026 Christian Hesse <mail@eworm.de>
 # https://rsc.eworm.de/COPYING.md
 #
-# requires RouterOS, version=7.19
+# requires RouterOS, version=7.21
 #
 # check for RouterOS health state - state plugin
 # https://rsc.eworm.de/doc/check-health.md
diff --git a/check-health.d/temperature.rsc b/check-health.d/temperature.rsc
index fdce5dcb..36975cfe 100644
--- a/check-health.d/temperature.rsc
+++ b/check-health.d/temperature.rsc
@@ -3,7 +3,7 @@
 # Copyright (c) 2019-2026 Christian Hesse <mail@eworm.de>
 # https://rsc.eworm.de/COPYING.md
 #
-# requires RouterOS, version=7.19
+# requires RouterOS, version=7.21
 #
 # check for RouterOS health state - temperature plugin
 # https://rsc.eworm.de/doc/check-health.md
@@ -30,8 +30,7 @@
   }
 
   :local TempToNum do={
-    :global CharacterReplace;
-    :local T [ :toarray [ $CharacterReplace $1 "." "," ] ];
+    :local T [ :toarray delimiter="." $1 ];
     :return ($T->0 * 10 + $T->1);
   }
 
diff --git a/check-health.d/voltage.rsc b/check-health.d/voltage.rsc
index 67febc2b..380556cc 100644
--- a/check-health.d/voltage.rsc
+++ b/check-health.d/voltage.rsc
@@ -3,7 +3,7 @@
 # Copyright (c) 2019-2026 Christian Hesse <mail@eworm.de>
 # https://rsc.eworm.de/COPYING.md
 #
-# requires RouterOS, version=7.19
+# requires RouterOS, version=7.21
 #
 # check for RouterOS health state - voltage plugin
 # https://rsc.eworm.de/doc/check-health.md
diff --git a/check-health.rsc b/check-health.rsc
index 51438966..2e864f50 100644
--- a/check-health.rsc
+++ b/check-health.rsc
@@ -3,7 +3,7 @@
 # Copyright (c) 2019-2026 Christian Hesse <mail@eworm.de>
 # https://rsc.eworm.de/COPYING.md
 #
-# requires RouterOS, version=7.19
+# requires RouterOS, version=7.21
 #
 # check for RouterOS health state
 # https://rsc.eworm.de/doc/check-health.md
@@ -31,8 +31,7 @@
   :global ValidateSyntax;
 
   :local TempToNum do={
-    :global CharacterReplace;
-    :local T [ :toarray [ $CharacterReplace $1 "." "," ] ];
+    :local T [ :toarray delimiter="." $1 ];
     :return ($T->0 * 10 + $T->1);
   }
 
diff --git a/doc/check-health.md b/doc/check-health.md
index 8ec79f5e..5af8f385 100644
--- a/doc/check-health.md
+++ b/doc/check-health.md
@@ -4,7 +4,7 @@ Notify about health state
 [![GitHub stars](https://img.shields.io/github/stars/eworm-de/routeros-scripts?logo=GitHub&style=flat&color=red)](https://github.com/eworm-de/routeros-scripts/stargazers)
 [![GitHub forks](https://img.shields.io/github/forks/eworm-de/routeros-scripts?logo=GitHub&style=flat&color=green)](https://github.com/eworm-de/routeros-scripts/network)
 [![GitHub watchers](https://img.shields.io/github/watchers/eworm-de/routeros-scripts?logo=GitHub&style=flat&color=blue)](https://github.com/eworm-de/routeros-scripts/watchers)
-[![required RouterOS version](https://img.shields.io/badge/RouterOS-7.19-yellow?style=flat)](https://mikrotik.com/download/changelogs/)
+[![required RouterOS version](https://img.shields.io/badge/RouterOS-7.21-yellow?style=flat)](https://mikrotik.com/download/changelogs/)
 [![Telegram group @routeros_scripts](https://img.shields.io/badge/Telegram-%40routeros__scripts-%2326A5E4?logo=telegram&style=flat)](https://t.me/routeros_scripts)
 [![donate with PayPal](https://img.shields.io/badge/Like_it%3F-Donate!-orange?logo=githubsponsors&logoColor=orange&style=flat)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=A4ZXBD6YS2W8J)