diff --git a/CHANGELOG.md b/CHANGELOG.md
index 03beab596..81918d5dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+# 4.2.1
+
+This minor release addresses a few bugs discovered after deploying 4.2.0:
+
+* The 4.2.0 release included major improvements to the sheet application. This introduced breaking changes to the "lock" system in the application. Existing spreadsheets (before 4.2.0) that were closed by a user without "unlocking" all cells first became impossible to open after the 4.2.0 changes. This has been fixed.
+* Team owners can now properly upload a team avatar.
+* We've improved the file upload script to better recognize markdown files.
+* We've fixed a few issues resulting in an error screen:
+  * New users were unable to create a drive without registering first.
+  * Snapshots in the sheet application couldn't be loaded.
+  * Loading an existing drive as an unregistered user could fail.
+
 # 4.2.0 (C)
 
 ## Goals
diff --git a/customize.dist/pages.js b/customize.dist/pages.js
index 708041915..3ea9606d6 100644
--- a/customize.dist/pages.js
+++ b/customize.dist/pages.js
@@ -62,7 +62,7 @@ define([
     var imprintUrl = AppConfig.imprint && (typeof(AppConfig.imprint) === "boolean" ?
                         '/imprint.html' : AppConfig.imprint);
 
-    Pages.versionString = "v4.2.0";
+    Pages.versionString = "v4.2.1";
 
     // used for the about menu
     Pages.imprintLink = AppConfig.imprint ? footLink(imprintUrl, 'imprint') : undefined;
diff --git a/www/common/outer/messenger.js b/www/common/outer/messenger.js
index adac6d758..1ac7a6e17 100644
--- a/www/common/outer/messenger.js
+++ b/www/common/outer/messenger.js
@@ -537,6 +537,13 @@ define([
             if (peer === hk) { return; }
             if (channel.readOnly) { return; }
 
+            // XXX review
+            // Sending myData is used to build a "mapId" object which links
+            // netflux IDs to a curvePublic/uid. We use this map in friend chat
+            // to detect is the other user is online and we also use it in team chat
+            // to show if other team members are online (in the roster section).
+            // It is not needed in the pad chat for now and only causes useless
+            // network usage.
             if (channel.isPadChat) { return; }
 
             // Join event will be sent once we are able to ID this peer
diff --git a/www/common/outer/team.js b/www/common/outer/team.js
index f959ee11b..31785e26b 100644
--- a/www/common/outer/team.js
+++ b/www/common/outer/team.js
@@ -1046,6 +1046,7 @@ define([
         if (!team) { return void cb ({error: 'ENOENT'}); }
         if (team.offline) { return void cb({error: 'OFFLINE'}); }
         if (!team.roster) { return void cb({error: 'NO_ROSTER'}); }
+        if (data.metadata) { delete data.metadata.offline; }
         team.roster.metadata(data.metadata, function (err) {
             if (err) { return void cb({error: err}); }
             var localTeam = ctx.store.proxy.teams[teamId];
diff --git a/www/common/sframe-common-outer.js b/www/common/sframe-common-outer.js
index 3614372a0..df49ee6a3 100644
--- a/www/common/sframe-common-outer.js
+++ b/www/common/sframe-common-outer.js
@@ -1742,7 +1742,7 @@ define([
                 var cpNfCfg = {
                     sframeChan: sframeChan,
                     channel: secret.channel,
-                    versionHash: parsed.hashData && parsed.hashData.versionHash,
+                    versionHash: cfg.type !== 'oo' && parsed.hashData && parsed.hashData.versionHash,
                     padRpc: Cryptpad.padRpc,
                     validateKey: secret.keys.validateKey || undefined,
                     isNewHash: isNewHash,