diff --git a/github/check.cstate.update b/github/check.cstate.update
new file mode 100755
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+++ b/github/check.cstate.update
@@ -0,0 +1,66 @@
+#!/bin/sh
+# Purpose {{{
+## Create a temp file (to monitor) if an upgrade is available for cState
+## project on Github.
+## It's based on the cState URL site to get the current version.
+## How-to use {{{
+### 1. Needs releasetags script, in the same directory
+### cf. https://git.ipr.univ-rennes1.fr/cellinfo/scripts/src/master/github/releasetags
+# wget https://git.ipr.univ-rennes1.fr/cellinfo/scripts/raw/master/github/releasetags
+### 2. Create a cron job with cState URL as first argument, eg.
+#00 20 * * * root /opt/repos/ipr.scripts/github/check.cstate.update https://vmstatus.domain.tld
+### 3. Monitor the temp file : /tmp/.github.cstate.upgrade
+# Or enable MAILTO in cronjob and edit the script to print a message.
+# Or send a mail.
+# …
+## }}}
+# }}}
+
+# Expect 1 argument {{{
+if [ $# -ne 1 ]
+then
+	cat << HELP
+
+check.cstate.update  --
+Compare current version of an installed cState site and the last available.
+
+EXAMPLE :
+    - Compare the current version installed on https://vmstatus.domain.tld
+        check.cstate.update https://vmstatus.domain.tld
+
+HELP
+
+	exit 1
+fi
+
+# }}}
+
+# Vars {{{
+DEBUG=1
+
+script_wd=$(dirname "${0}")
+
+cstate_url="${1}"
+cstate_current_version=$(curl --insecure --silent "${cstate_url}" | grep -E 'meta.*generator.*cState.*github.com' | sed 's;.*generator.*content.*cState \(v.*\) - https.*github.com.*;\1;')
+
+cstate_repo_url="https://github.com/cstate/cstate"
+cstate_new_version=$("${script_wd}"/releasetags "${cstate_repo_url}" | head -n1)
+
+cstate_new_version_file="/tmp/.github.cstate.upgrade"
+# }}}
+
+# Check if the current version is the last one {{{
+if [ "${cstate_current_version}" != "${cstate_new_version}" ]; then
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — Current version (${cstate_current_version}) and new one (${cstate_new_version}) seems to be different."
+
+	## Create a temp file to monitor
+	touch -- "${cstate_new_version_file}"
+	printf '\e[1;35m%-6s\e[m\n' "An upgrade is available for cState (current : ${cstate_current_version}) : ${cstate_new_version}." >> "${cstate_new_version_file}"
+
+else
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — The current version is up-to-date."
+	rm -f -- "${cstate_new_version_file}"
+fi
+# }}}
+
+exit 0