diff --git a/_includes/upgrade-notice.html b/_includes/upgrade-notice.html
index 36bb7f9..6f680fc 100644
--- a/_includes/upgrade-notice.html
+++ b/_includes/upgrade-notice.html
@@ -1,35 +1,31 @@
 <script>
   function updateUpgradeNotice() {
-    const activationTime = 1605441600;
+    const activationTime = 1621080000;
     const secondsInAWeek = 604800;
 
     // When the upgrade activation is 10 weeks away, make the upgrade notice visible
     const unixTime = Math.floor((new Date()).getTime() / 1000);
     if ((unixTime > activationTime - 10 * secondsInAWeek) && (unixTime <= activationTime)) {
       $("#upgrade-notice-pre-activation").css("display", "");
     }
 
     // For the week following the upgrade activation, show a message for late-comers
     if ((unixTime > activationTime) && (unixTime < activationTime + secondsInAWeek)) {
       $("#upgrade-notice-post-activation").css("display", "");
     }
   }
   document.addEventListener('DOMContentLoaded', updateUpgradeNotice);
 </script>
 
 <div id="upgrade-notice-pre-activation" class="hero-box" style="background: #ffe090; display: none;">
-  <h3>Prepare for the November 2020 protocol upgrade today!</h3>
-  All release versions 0.22.0 and later are compatible with the
-  <a href="https://blog.bitcoinabc.org/2020/09/14/preparing-businesses-for-a-successful-network-upgrade/">planned protocol upgrade</a>
-  that is scheduled to activate on
-  <span style="font-weight: bold">November 15th, 2020</span>.
-  Update early to keep your node in sync with the BCHA or BCHN network.
+  <h3>Prepare for the May 2021 upgrade today!</h3>
+  In order to keep running after May 15th, 2021, your node needs to
+  be updated to version 0.23.0 or later.<br />
+  Update early to keep your node in sync with the BCHA network !
 </div>
 
 <div id="upgrade-notice-post-activation" class="hero-box" style="background: #ffb0a0; display: none;">
-  <h3>The November 2020 protocol upgrade has activated!</h3>
-  Bitcoin Cash is now following
-  <a href="https://blog.bitcoinabc.org/2020/09/14/preparing-businesses-for-a-successful-network-upgrade/">new protocol rules</a>.
-  If you forgot to upgrade to 0.22.0 or later, your node is no longer in sync with the rest of the network!
+  <h3>The May 2021 upgrade has activated!</h3>
+  If you forgot to upgrade to 0.23.0 or later, your node is no longer in sync with the rest of the network!
   Upgrade to the latest release below.
 </div>