diff --git a/appdefs.xml b/appdefs.xml
index 1f9d45b..a4d63c1 100644
--- a/appdefs.xml
+++ b/appdefs.xml
@@ -107,6 +107,11 @@ details.
     </documentation>
     <!-- Changelog of the application. -->
     <history>
+      <release>
+        <version>1.9.1</version>
+        <date>2020-02-10</date>
+        <change>Upgraded Firefox to version 72.0.2-r0.</change>
+      </release>
       <release>
         <version>1.9.0</version>
         <date>2020-01-14</date>