diff --git a/appdefs.xml b/appdefs.xml
index 81f3ecf..1f9d45b 100644
--- a/appdefs.xml
+++ b/appdefs.xml
@@ -107,6 +107,11 @@ details.
     </documentation>
     <!-- Changelog of the application. -->
     <history>
+      <release>
+        <version>1.9.0</version>
+        <date>2020-01-14</date>
+        <change>Upgraded Firefox to version 72.0.1-r0.</change>
+      </release>
       <release>
         <version>1.8.0</version>
         <date>2019-12-25</date>