diff --git a/chkboot b/chkboot
index dbcdea2..8c39e2c 100755
--- a/chkboot
+++ b/chkboot
@@ -5,7 +5,7 @@
 # author: ju (ju at heisec dot de)
 # contributors: inhies, prurigro
 #
-# license: GPLv2
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # a reminder that this will NOT protect against:
 #   -a trojan hiding in your BIOS
diff --git a/chkboot-bootcheck b/chkboot-bootcheck
index 5766925..1329bed 100755
--- a/chkboot-bootcheck
+++ b/chkboot-bootcheck
@@ -6,7 +6,7 @@
 # author: ju (ju at heisec dot de)
 # contributors: inhies, prurigro
 #
-# license: GPLv2
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 source /etc/default/chkboot.conf
 
diff --git a/chkboot-check b/chkboot-check
index 1e7e0da..a62d506 100755
--- a/chkboot-check
+++ b/chkboot-check
@@ -5,7 +5,7 @@
 # author: ju (ju at heisec dot de)
 # contributors: inhies, prurigro
 #
-# license: GPLv2
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 source /etc/default/chkboot.conf
 
diff --git a/mkinitcpio-hooks/chkboot-initcpio b/mkinitcpio-hooks/chkboot-initcpio
index a12c3d9..bdc0ff5 100755
--- a/mkinitcpio-hooks/chkboot-initcpio
+++ b/mkinitcpio-hooks/chkboot-initcpio
@@ -7,7 +7,7 @@
 # author: ju (ju at heisec dot de)
 # contributors: inhies, prurigro
 #
-# license: GPLv2
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 build() {
     echo "Updating chkboot hashes of your boot files..."
diff --git a/notification/chkboot-desktopalert b/notification/chkboot-desktopalert
index 0991200..8f21228 100755
--- a/notification/chkboot-desktopalert
+++ b/notification/chkboot-desktopalert
@@ -3,7 +3,7 @@
 # small script to check if files under /boot changed
 # Author: https://github.com/sercxanto
 #
-# License: GPLv2 or later
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 source /etc/default/chkboot.conf
 
diff --git a/notification/chkboot-profilealert.sh b/notification/chkboot-profilealert.sh
index 6fb9a78..a60c220 100755
--- a/notification/chkboot-profilealert.sh
+++ b/notification/chkboot-profilealert.sh
@@ -5,7 +5,7 @@
 # author: ju (ju at heisec dot de)
 # contributors: inhies, prurigro
 #
-# license: GPLv2
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 source /etc/default/chkboot.conf