diff --git a/LICENSE.txt b/LICENSE.txt
index e953b5d7..48335eb0 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -6,16 +6,20 @@ For files in the "stuff/library/mypaint brushes" directory: Please see the licen
 
 Tahoma2D
 
+All contributions by John Dancel:
+Copyright (c) 2016 - 2023, John Dancel
+All rights reserved.
+
 All contributions by Jeremy Bullock:
-Copyright (c) 2016 - 2020, Jeremy Bullock
+Copyright (c) 2016 - 2023, Jeremy Bullock
 All rights reserved.
 
 All contributions by DWANGO:
-Copyright (c) 2016 - 2020, DWANGO Co., Ltd.
+Copyright (c) 2016 - 2023, DWANGO Co., Ltd.
 All rights reserved.
 
 All other contributions:
-Copyright (c) 2016 - 2020, the respective contributors.
+Copyright (c) 2016 - 2023, the respective contributors.
 All rights reserved.
 
 Each contributor holds copyright over their respective contributions.
diff --git a/stuff/doc/LICENSE/LICENSE.txt b/stuff/doc/LICENSE/LICENSE.txt
index dba6d67b..51cd08b9 100644
--- a/stuff/doc/LICENSE/LICENSE.txt
+++ b/stuff/doc/LICENSE/LICENSE.txt
@@ -5,15 +5,19 @@ For licenses of third party libraries exploited in this software, please see the
 Tahoma2D
 
 All contributions by John Dancel:
-Copyright (c) 2016 - 2021, John Dancel
+Copyright (c) 2016 - 2023, John Dancel
+All rights reserved.
+
+All contributions by Jeremy Bullock:
+Copyright (c) 2016 - 2023, Jeremy Bullock
 All rights reserved.
 
 All contributions by DWANGO:
-Copyright (c) 2016 - 2021, DWANGO Co., Ltd.
+Copyright (c) 2016 - 2023, DWANGO Co., Ltd.
 All rights reserved.
 
 All other contributions:
-Copyright (c) 2016 - 2021, the respective contributors.
+Copyright (c) 2016 - 2023, the respective contributors.
 All rights reserved.
 
 Each contributor holds copyright over their respective contributions.
diff --git a/stuff/doc/LICENSE/LICENSE_opentoonz.txt b/stuff/doc/LICENSE/LICENSE_opentoonz.txt
index 1ba089ad..e0912683 100644
--- a/stuff/doc/LICENSE/LICENSE_opentoonz.txt
+++ b/stuff/doc/LICENSE/LICENSE_opentoonz.txt
@@ -5,11 +5,11 @@ For licenses of third party libraries exploited in this software, please see the
 OpenToonz
 
 All contributions by DWANGO:
-Copyright (c) 2016 - 2021, DWANGO Co., Ltd.
+Copyright (c) 2016 - 2023, DWANGO Co., Ltd.
 All rights reserved.
 
 All other contributions:
-Copyright (c) 2016 - 2021, the respective contributors.
+Copyright (c) 2016 - 2023, the respective contributors.
 All rights reserved.
 
 Each contributor holds copyright over their respective contributions.