diff --git a/appdefs.xml b/appdefs.xml
index 9544243..e0f52bb 100644
--- a/appdefs.xml
+++ b/appdefs.xml
@@ -31,6 +31,11 @@ from Jinja2 templates.
     </documentation>
     <!-- Changelog of the application. -->
     <history>
+      <release>
+        <version>1.12.0</version>
+        <date>2017-12-17</date>
+        <change>Upgraded MKVToolNix to version 19.0.0.</change>
+      </release>
       <release>
         <version>1.11.2</version>
         <date>2017-12-12</date>