diff --git a/app/static/all_licenses_preamble.html b/app/static/all_licenses_preamble.html
index 8e34a5836..55f3a4da9 100644
--- a/app/static/all_licenses_preamble.html
+++ b/app/static/all_licenses_preamble.html
@@ -1,5 +1,5 @@
 ## Mailspring Electron Application ("Mailspring")
-Copyright 2016-2018 Foundry 376, LLC., all rights reserved.
+Copyright 2016-2021 Foundry 376, LLC., all rights reserved.
 
 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
@@ -17,21 +17,24 @@ https://github.com/Foundry376/Mailspring/blob/master/LICENSE.md
 <div style="height: 40px;"></div>
 
 ## Mailspring Sync Engine ("Mailsync")
-Copyright 2016-2018 Foundry 376, LLC., all rights reserved.
+Copyright 2016-2021 Foundry 376, LLC., all rights reserved.
 
-Redistribution and use of the Mailspring Sync Engine in binary form,
-without modification, is permitted, provided it is used in conjunction
-with the Mailspring desktop application under it's original name.
-("Mailspring")
+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.
 
-Use of the Mailspring Sync Engine in other applications, in forks of
-Mailspring, or in new projects requiring email requires written
-permission from Foundry 376, LLC. Please contact ben@foundry376.com
-for licensing information and source code inquiries.
+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.
+
+See the full license here:
+https://github.com/Foundry376/Mailspring-Sync/blob/master/LICENSE.md
 
 <div style="height: 40px;"></div>
 
 ## Third-party Packages
 
 This application bundles the following third-party packages in accordance
-with the following licenses:
\ No newline at end of file
+with the following licenses: