diff --git a/dist/update/update.xml b/dist/update/update.xml
index 627131ff0..5f4aeb0ec 100644
--- a/dist/update/update.xml
+++ b/dist/update/update.xml
@@ -5,14 +5,14 @@
       <RDF:Seq>
         <RDF:li>
           <RDF:Description>
-            <em:version>1.16.4.20</em:version>
+            <em:version>1.16.4.21</em:version>
             <!-- Firefox -->
             <em:targetApplication>
               <RDF:Description>
                 <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
                 <em:minVersion>32.0</em:minVersion>
                 <em:maxVersion>56.0</em:maxVersion>
-                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.20/uBlock0_1.16.4.20.firefox-legacy.xpi</em:updateLink>
+                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.21/uBlock0_1.16.4.21.firefox-legacy.xpi</em:updateLink>
               </RDF:Description>
             </em:targetApplication>
             <!-- Fennec -->
@@ -21,7 +21,7 @@
                 <em:id>{aa3c5121-dab2-40e2-81ca-7ea25febc110}</em:id>
                 <em:minVersion>32.0</em:minVersion>
                 <em:maxVersion>56.0</em:maxVersion>
-                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.20/uBlock0_1.16.4.20.firefox-legacy.xpi</em:updateLink>
+                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.21/uBlock0_1.16.4.21.firefox-legacy.xpi</em:updateLink>
               </RDF:Description>
             </em:targetApplication>
             <!-- SeaMonkey -->
@@ -30,7 +30,7 @@
                 <em:id>{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}</em:id>
                 <em:minVersion>2.24</em:minVersion>
                 <em:maxVersion>2.*</em:maxVersion>
-                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.20/uBlock0_1.16.4.20.firefox-legacy.xpi</em:updateLink>
+                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.21/uBlock0_1.16.4.21.firefox-legacy.xpi</em:updateLink>
               </RDF:Description>
             </em:targetApplication>
             <!-- Pale Moon -->
@@ -39,7 +39,7 @@
                 <em:id>{8de7fcbb-c55c-4fbe-bfc5-fc555c87dbc4}</em:id>
                 <em:minVersion>27.0.0</em:minVersion>
                 <em:maxVersion>28.*</em:maxVersion>
-                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.20/uBlock0_1.16.4.20.firefox-legacy.xpi</em:updateLink>
+                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.21/uBlock0_1.16.4.21.firefox-legacy.xpi</em:updateLink>
               </RDF:Description>
             </em:targetApplication>
             <!-- Thunderbird -->
@@ -48,7 +48,7 @@
                 <em:id>{3550f703-e582-4d05-9a08-453d09bdfdc6}</em:id>
                 <em:minVersion>31.0</em:minVersion>
                 <em:maxVersion>52.*</em:maxVersion>
-                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.20/uBlock0_1.16.4.20.firefox-legacy.xpi</em:updateLink>
+                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.21/uBlock0_1.16.4.21.firefox-legacy.xpi</em:updateLink>
               </RDF:Description>
             </em:targetApplication>
             <!-- Iceape-UXP -->
@@ -57,7 +57,7 @@
                 <em:id>{9184b6fe-4a5c-484d-8b4b-efbfccbfb514}</em:id>
                 <em:minVersion>52.0</em:minVersion>
                 <em:maxVersion>52.*</em:maxVersion>
-                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.20/uBlock0_1.16.4.20.firefox-legacy.xpi</em:updateLink>
+                <em:updateLink>https://github.com/gorhill/uBlock-for-firefox-legacy/releases/download/firefox-legacy-1.16.4.21/uBlock0_1.16.4.21.firefox-legacy.xpi</em:updateLink>
               </RDF:Description>
             </em:targetApplication>
           </RDF:Description>