diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae5077d..1c9d1b0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,20 @@
+# Copyright (C) 2013-2025  Eugen Wissner <belka@caraus.de>
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 cmake_minimum_required(VERSION 3.21)
-project(slack-timedate)
+project(slack-timedate VERSION 2.1)
 
 include(GNUInstallDirs)
 
@@ -8,3 +23,5 @@ set(CMAKE_CXX_STANDARD 17)
 
 add_subdirectory(data)
 add_subdirectory(src)
+
+set_property(GLOBAL PROPERTY VERSION ${PROJECT_VERSION})
diff --git a/data/CMakeLists.txt b/data/CMakeLists.txt
index 2e8ec92..394989c 100644
--- a/data/CMakeLists.txt
+++ b/data/CMakeLists.txt
@@ -1,3 +1,18 @@
+# Copyright (C) 2013-2025  Eugen Wissner <belka@caraus.de>
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 find_program(SED sed)
 
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/resources.h.in" "resources.h")
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 81bf237..3ce7c6a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,3 +1,18 @@
+# Copyright (C) 2013-2025  Eugen Wissner <belka@caraus.de>
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 find_package(PkgConfig)
 pkg_check_modules(GDBUS REQUIRED gio-2.0 dbus-1 glibmm-2.4 giomm-2.4)
 
diff --git a/src/main.cpp b/src/main.cpp
index f57f020..92deafc 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2024  Eugen Wissner <belka@caraus.de>
+ * Copyright (C) 2013-2025  Eugen Wissner <belka@caraus.de>
  * 
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -13,7 +13,6 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
  */
 #include "timedate.h"
 
diff --git a/src/timedate.cpp b/src/timedate.cpp
index c67ab52..3c17ffc 100644
--- a/src/timedate.cpp
+++ b/src/timedate.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2024  Eugen Wissner <belka@caraus.de>
+ * Copyright (C) 2013-2025  Eugen Wissner <belka@caraus.de>
  * 
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -13,7 +13,6 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
  */
 #include <cstring>
 #include <filesystem>
diff --git a/src/timedate.h b/src/timedate.h
index e197b4b..31d0621 100644
--- a/src/timedate.h
+++ b/src/timedate.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2024  Eugen Wissner <belka@caraus.de>
+ * Copyright (C) 2013-2025  Eugen Wissner <belka@caraus.de>
  * 
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -13,7 +13,6 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
  */
 #pragma once