diff --git a/HISTORY.md b/HISTORY.md
index 46170ea4..ed07b8be 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -50,6 +50,9 @@
     * German
     * Chinese, thanks, Simon!
 
+### 2021-11-09
+* objects, store: refactored block-migration mechanism
+
 ### 2021-11-08
 * objects: renamed some internal color methods
 * objects, store: renamed internal pen color channel cache
diff --git a/snap.html b/snap.html
index 72018aa6..f8db8835 100755
--- a/snap.html
+++ b/snap.html
@@ -18,7 +18,7 @@
         <script src="src/widgets.js?version=2021-17-07"></script>
         <script src="src/blocks.js?version=2021-11-08"></script>
         <script src="src/threads.js?version=2021-11-08"></script>
-        <script src="src/objects.js?version=2021-11-08"></script>
+        <script src="src/objects.js?version=2021-11-09"></script>
         <script src="src/scenes.js?version=2021-10-12"></script>
         <script src="src/gui.js?version=2021-11-08"></script>
         <script src="src/paint.js?version=2021-07-05"></script>
@@ -30,7 +30,7 @@
         <script src="src/maps.js?version=2021-06-15"></script>
         <script src="src/extensions.js?version=2021-11-08"></script>
         <script src="src/xml.js?version=2021-07-05"></script>
-        <script src="src/store.js?version=2021-11-08"></script>
+        <script src="src/store.js?version=2021-11-09"></script>
         <script src="src/locale.js?version=2021-10-28"></script>
         <script src="src/cloud.js?version=2021-02-04"></script>
         <script src="src/api.js?version=2021-07-05"></script>
diff --git a/src/objects.js b/src/objects.js
index 6986f0fc..9e4c4d2d 100644
--- a/src/objects.js
+++ b/src/objects.js
@@ -87,7 +87,7 @@ BlockVisibilityDialogMorph*/
 
 /*jshint esversion: 6*/
 
-modules.objects = '2021-November-08';
+modules.objects = '2021-November-09';
 
 var SpriteMorph;
 var StageMorph;
@@ -1618,8 +1618,7 @@ SpriteMorph.prototype.initBlockMigrations = function () {
             offset: 1
         },
         setPenHSVA: {
-            selector: 'setPenColorDimension',
-            offset: 0
+            selector: 'setPenColorDimension'
         },
         changeHue: {
             selector: 'changePenColorDimension',
@@ -1632,16 +1631,13 @@ SpriteMorph.prototype.initBlockMigrations = function () {
             offset: 1
         },
         changePenHSVA: {
-            selector: 'changePenColorDimension',
-            offset: 0
+            selector: 'changePenColorDimension'
         },
         setBackgroundHSVA: {
-            selector: 'setBackgroundColorDimension',
-            offset: 0
+            selector: 'setBackgroundColorDimension'
         },
         changeBackgroundHSVA: {
-            selector: 'changeBackgroundColorDimension',
-            offset: 0
+            selector: 'changeBackgroundColorDimension'
         },
         reportIsFastTracking: {
             selector: 'reportGlobalFlag',
@@ -1670,8 +1666,7 @@ SpriteMorph.prototype.initBlockMigrations = function () {
         },
         doSend: {
             selector: 'doBroadcast',
-            expand: 1,
-            offset: 0
+            expand: 1
         }
     };
 };
diff --git a/src/store.js b/src/store.js
index 53a3539c..e2ebbc57 100644
--- a/src/store.js
+++ b/src/store.js
@@ -63,7 +63,7 @@ Project*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.store = '2021-November-08';
+modules.store = '2021-November-09';
 
 // XML_Serializer ///////////////////////////////////////////////////////
 /*
@@ -1199,7 +1199,7 @@ SnapSerializer.prototype.loadBlock = function (model, isReporter, object) {
                 model.attributes.s
             ];
             if (migration) {
-                migrationOffset = migration.offset;
+                migrationOffset = migration.offset || 0;
             }
         }
     } else if (model.tag === 'custom-block') {