diff --git a/HISTORY.md b/HISTORY.md
index 7ae4498cc..4f44cf6da 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,24 @@
+## v2.6.0, 2022-April-13
+
+* [#330](https://github.com/meteor/blaze/pull/330) Removed deprecated APIs from before Meteor 1.0
+  * This is potentially breaking, especially for old packages and apps.
+  * `blaze-html-templates@2.0.0`
+    * Dependency on `ui` and `spacebars` package has been removed
+  * `spacebars@1.3.0`
+    * `Spacebars.TemplateWith` has been removed, please use `Blaze._TemplateWith` if you need it.
+  * `blaze@2.6.0`
+    * `Blaze.InOuterTemplateScope` has been removed, if you need it, you can use `Blaze._InOuterTemplateScope`
+  * `templating-runtime@1.6.0`
+    * `Template.__define__` has been removed
+    * `UI.body` has been removed, you should be using `Template.body`
+    * `Template.__body__` has been removed, you should be using `Template.body`
+    * `Template.__body__.__contentParts` has been removed, you should be using `Template.body.contentViews`
+    * `Template.__body__.__instantiate` has been removed, you should be using `Template.body.renderToDocument`
+* [#341](https://github.com/meteor/blaze/pull/341) Add support for arbitrary iterables in #each templates
+* [#358](https://github.com/meteor/blaze/pull/358) Make Template.contentBlock consistent with/out data provided
+* [#359](https://github.com/meteor/blaze/pull/359) Underscore has been removed from observe sequence
+* Updated testing dependencies
+
 ## v2.5.0, 2021-June-5
 
 * [#331](https://github.com/meteor/blaze/pull/331) Remove underscore and all of its methods in the code
diff --git a/packages/blaze-hot/package.js b/packages/blaze-hot/package.js
index 6deb84557..f4cad2c35 100644
--- a/packages/blaze-hot/package.js
+++ b/packages/blaze-hot/package.js
@@ -1,7 +1,7 @@
 Package.describe({
   name: 'blaze-hot',
   summary: "Update files using Blaze's API with HMR",
-  version: '1.1.0',
+  version: '1.1.1',
   git: 'https://github.com/meteor/blaze.git',
   documentation: null,
   debugOnly: true
@@ -10,8 +10,8 @@ Package.describe({
 Package.onUse(function (api) {
   api.use('modules@0.16.0');
   api.use('ecmascript@0.15.1');
-  api.use('blaze@2.5.0');
-  api.use('templating-runtime@1.4.0');
+  api.use('blaze@2.6.0');
+  api.use('templating-runtime@1.6.0');
   api.use('hot-module-replacement@0.2.0', { weak: true });
 
   api.addFiles('hot.js', 'client');
diff --git a/packages/blaze-html-templates/package.js b/packages/blaze-html-templates/package.js
index dfe5a863b..99341411d 100644
--- a/packages/blaze-html-templates/package.js
+++ b/packages/blaze-html-templates/package.js
@@ -1,7 +1,7 @@
 Package.describe({
   name: 'blaze-html-templates',
   summary: "Compile HTML templates into reactive UI with Meteor Blaze",
-  version: '1.2.1',
+  version: '2.0.0',
   git: 'https://github.com/meteor/blaze.git'
 });
 
@@ -10,12 +10,6 @@ Package.onUse(function(api) {
     // A library for reactive user interfaces
     'blaze@2.5.0',
 
-    // The following packages are basically empty shells that just exist to
-    // satisfy code checking for the existence of a package. Rest assured that
-    // they are not adding any bloat to your bundle.
-    'ui@1.0.13', // XXX COMPAT WITH PACKAGES BUILT FOR 0.9.0.
-    'spacebars@1.2.0', // XXX COMPAT WITH PACKAGES BUILT FOR 0.9.0
-
     // Compile .html files into Blaze reactive views
     'templating@1.4.1'
   ]);
diff --git a/packages/blaze-tools/package.js b/packages/blaze-tools/package.js
index 81c24c326..7e9722bfd 100644
--- a/packages/blaze-tools/package.js
+++ b/packages/blaze-tools/package.js
@@ -1,13 +1,13 @@
 Package.describe({
   name: 'blaze-tools',
   summary: "Compile-time tools for Blaze",
-  version: '1.1.2',
+  version: '1.1.3',
   git: 'https://github.com/meteor/blaze.git'
 });
 
 Package.onUse(function (api) {
   api.use('ecmascript@0.15.1');
-  api.use('htmljs@1.1.0');
+  api.use('htmljs@1.1.1');
 
   api.export('BlazeTools');
   api.mainModule('preamble.js');
@@ -18,7 +18,7 @@ Package.onTest(function (api) {
   api.use('ecmascript');
 
   api.use('blaze-tools');
-  api.use('html-tools@1.1.1');
+  api.use('html-tools@1.1.3');
 
   api.addFiles([
     'token_tests.js'
diff --git a/packages/blaze/builtins.js b/packages/blaze/builtins.js
index e6549aec2..0735d3cb2 100644
--- a/packages/blaze/builtins.js
+++ b/packages/blaze/builtins.js
@@ -353,5 +353,3 @@ Blaze._InOuterTemplateScope = function (templateView, contentFunc) {
   return view;
 };
 
-// XXX COMPAT WITH 0.9.0
-Blaze.InOuterTemplateScope = Blaze._InOuterTemplateScope;
diff --git a/packages/blaze/lookup.js b/packages/blaze/lookup.js
index 9d5f36c8e..87d427238 100644
--- a/packages/blaze/lookup.js
+++ b/packages/blaze/lookup.js
@@ -84,6 +84,25 @@ var wrapHelper = function (f, templateFunc) {
   };
 };
 
+function _lexicalKeepGoing(currentView) {
+  if (!currentView.parentView) {
+    return undefined;
+  }
+  if (!currentView.__startsNewLexicalScope) {
+    return currentView.parentView;
+  }
+  if (currentView.parentView.__childDoesntStartNewLexicalScope) {
+    return currentView.parentView;
+  }
+  
+  // in the case of {{> Template.contentBlock data}} the contentBlock loses the lexical scope of it's parent, wheras {{> Template.contentBlock}} it does not
+  // this is because a #with sits between the include InOuterTemplateScope
+  if (currentView.parentView.name === "with" && currentView.parentView.parentView && currentView.parentView.parentView.__childDoesntStartNewLexicalScope) {
+    return currentView.parentView;
+  }
+  return undefined;
+}
+
 Blaze._lexicalBindingLookup = function (view, name) {
   var currentView = view;
   var blockHelpersStack = [];
@@ -99,10 +118,7 @@ Blaze._lexicalBindingLookup = function (view, name) {
         return bindingReactiveVar.get();
       };
     }
-  } while (! (currentView.__startsNewLexicalScope &&
-              ! (currentView.parentView &&
-                 currentView.parentView.__childDoesntStartNewLexicalScope))
-           && (currentView = currentView.parentView));
+  } while (currentView = _lexicalKeepGoing(currentView));
 
   return null;
 };
diff --git a/packages/blaze/package.js b/packages/blaze/package.js
index 5349f4fe3..60aa9a10f 100644
--- a/packages/blaze/package.js
+++ b/packages/blaze/package.js
@@ -1,7 +1,7 @@
 Package.describe({
   name: 'blaze',
   summary: "Meteor Reactive Templating library",
-  version: '2.5.0',
+  version: '2.6.0',
   git: 'https://github.com/meteor/blaze.git'
 });
 
@@ -27,8 +27,8 @@ Package.onUse(function (api) {
     'Handlebars'
   ]);
 
-  api.use('htmljs@1.1.0');
-  api.imply('htmljs@1.1.0');
+  api.use('htmljs@1.1.1');
+  api.imply('htmljs@1.1.1');
 
   api.addFiles([
     'preamble.js'
@@ -63,8 +63,8 @@ Package.onTest(function (api) {
   api.use('tracker@1.1.0');
 
   api.use('blaze');
-  api.use('blaze-tools@1.1.2'); // for BlazeTools.toJS
-  api.use('html-tools@1.1.0');
+  api.use('blaze-tools@1.1.3'); // for BlazeTools.toJS
+  api.use('html-tools@1.1.3');
   api.use('templating');
 
   api.addFiles('view_tests.js');
diff --git a/packages/html-tools/package.js b/packages/html-tools/package.js
index df1e2c988..af5d8d183 100644
--- a/packages/html-tools/package.js
+++ b/packages/html-tools/package.js
@@ -1,14 +1,14 @@
 Package.describe({
   name: 'html-tools',
   summary: "Standards-compliant HTML tools",
-  version: '1.1.2',
+  version: '1.1.3',
   git: 'https://github.com/meteor/blaze.git'
 });
 
 Package.onUse(function (api) {
   api.use('ecmascript@0.15.1');
-  api.use('htmljs@1.1.0');
-  api.imply('htmljs@1.1.0');
+  api.use('htmljs@1.1.1');
+  api.imply('htmljs@1.1.1');
 
   api.export('HTMLTools');
   api.mainModule('main.js');
@@ -19,7 +19,7 @@ Package.onTest(function (api) {
   api.use('tinytest@1.1.0');
 
   api.use('html-tools');
-  api.use('htmljs@1.1.0');
+  api.use('htmljs@1.1.1');
   api.use('blaze-tools'); // for `toJS`
 
   api.addFiles([
diff --git a/packages/observe-sequence/observe_sequence.js b/packages/observe-sequence/observe_sequence.js
index 54fbfed19..fd4a591c3 100644
--- a/packages/observe-sequence/observe_sequence.js
+++ b/packages/observe-sequence/observe_sequence.js
@@ -1,3 +1,17 @@
+const isObject = function (value) {
+  var type = typeof value;
+  return value != null && (type == 'object' || type == 'function');
+}
+const has = function (obj, key) {
+  var keyParts = key.split('.');
+
+  return !!obj && (
+    keyParts.length > 1
+      ? has(obj[key.split('.')[0]], keyParts.slice(1).join('.'))
+      : hasOwnProperty.call(obj, key)
+  );
+};
+
 const warn = function () {
   if (ObserveSequence._suppressWarnings) {
     ObserveSequence._suppressWarnings--;
@@ -15,7 +29,18 @@ const warn = function () {
 // subclassed arrays: instanceof Array === true, _.isArray(arr) === false
 // see specific tests
 function isArray(arr) {
-  return arr instanceof Array || _.isArray(arr);
+  return arr instanceof Array || Array.isArray(arr);
+}
+
+// isIterable returns trues for objects implementing iterable protocol,
+// except strings, as {{#each 'string'}} doesn't make much sense.
+// Requires ES6+ and does not work in IE (but degrades gracefully).
+// Does not support the `length` + index protocol also supported by Array.from
+function isIterable (object) {
+  const iter = typeof Symbol != 'undefined' && Symbol.iterator;
+  return iter
+    && object instanceof Object // note: returns false for strings
+    && typeof object[iter] == 'function'; // implements iterable protocol
 }
 
 const idStringify = MongoID.idStringify;
@@ -94,7 +119,7 @@ ObserveSequence = {
         if (activeObserveHandle) {
           // If we were previously observing a cursor, replace lastSeqArray with
           // more up-to-date information.  Then stop the old observe.
-          lastSeqArray = _.map(lastSeq.fetch(), function (doc) {
+          lastSeqArray = lastSeq.fetch().map(function (doc) {
             return {_id: doc._id, item: doc};
           });
           activeObserveHandle.stop();
@@ -110,6 +135,9 @@ ObserveSequence = {
                 seqChangedToCursor(lastSeqArray, seq, callbacks);
           seqArray = result[0];
           activeObserveHandle = result[1];
+        } else if (isIterable(seq)) {
+          const array = Array.from(seq);
+          seqArray = seqChangedToArray(lastSeqArray, array, callbacks);
         } else {
           throw badSequenceError(seq);
         }
@@ -139,6 +167,8 @@ ObserveSequence = {
       return seq;
     } else if (isStoreCursor(seq)) {
       return seq.fetch();
+    } else if (isIterable(seq)) {
+      return Array.from(seq);
     } else {
       throw badSequenceError(seq);
     }
@@ -200,13 +230,17 @@ function sequenceGotValue(sequence) {
 
 const badSequenceError = function (sequence) {
   return new Error("{{#each}} currently only accepts " +
-                   "arrays, cursors or falsey values." +
+                   "arrays, cursors, iterables or falsey values." +
                    sequenceGotValue(sequence));
 };
 
+const isFunction = (func) => {
+  return typeof func === "function";
+}
+
 const isStoreCursor = function (cursor) {
-  return cursor && _.isObject(cursor) &&
-    _.isFunction(cursor.observe) && _.isFunction(cursor.fetch);
+  return cursor && isObject(cursor) &&
+    isFunction(cursor.observe) && isFunction(cursor.fetch);
 };
 
 // Calculates the differences between `lastSeqArray` and
@@ -221,11 +255,11 @@ const diffArray = function (lastSeqArray, seqArray, callbacks) {
   var posCur = {};
   var lengthCur = lastSeqArray.length;
 
-  _.each(seqArray, function (doc, i) {
+  seqArray.forEach(function (doc, i) {
     newIdObjects.push({_id: doc._id});
     posNew[idStringify(doc._id)] = i;
   });
-  _.each(lastSeqArray, function (doc, i) {
+  lastSeqArray.forEach(function (doc, i) {
     oldIdObjects.push({_id: doc._id});
     posOld[idStringify(doc._id)] = i;
     posCur[idStringify(doc._id)] = i;
@@ -242,7 +276,7 @@ const diffArray = function (lastSeqArray, seqArray, callbacks) {
       if (before) {
         // If not adding at the end, we need to update indexes.
         // XXX this can still be improved greatly!
-        _.each(posCur, function (pos, id) {
+        Object.entries(posCur).forEach(function ([id, pos]) {
           if (pos >= position)
             posCur[id]++;
         });
@@ -285,7 +319,7 @@ const diffArray = function (lastSeqArray, seqArray, callbacks) {
       //   2. The element is moved back. Then the positions in between *and* the
       //   element that is currently standing on the moved element's future
       //   position are moved forward.
-      _.each(posCur, function (elCurPosition, id) {
+      Object.entries(posCur).forEach(function ([id, elCurPosition]) {
         if (oldPosition < elCurPosition && elCurPosition < newPosition)
           posCur[id]--;
         else if (newPosition <= elCurPosition && elCurPosition < oldPosition)
@@ -305,7 +339,7 @@ const diffArray = function (lastSeqArray, seqArray, callbacks) {
     removed: function (id) {
       var prevPosition = posCur[idStringify(id)];
 
-      _.each(posCur, function (pos, id) {
+      Object.entries(posCur).forEach(function ([id, pos]) {
         if (pos >= prevPosition)
           posCur[id]--;
       });
@@ -319,10 +353,12 @@ const diffArray = function (lastSeqArray, seqArray, callbacks) {
         prevPosition);
     }
   });
+  
+  Object.entries(posNew).forEach(function ([idString, pos]) {
 
-  _.each(posNew, function (pos, idString) {
     var id = idParse(idString);
-    if (_.has(posOld, idString)) {
+    
+    if (has(posOld, idString)) {
       // specifically for primitive types, compare equality before
       // firing the 'changedAt' callback. otherwise, always fire it
       // because doing a deep EJSON comparison is not guaranteed to
@@ -345,7 +381,7 @@ seqChangedToEmpty = function (lastSeqArray, callbacks) {
 
 seqChangedToArray = function (lastSeqArray, array, callbacks) {
   var idsUsed = {};
-  var seqArray = _.map(array, function (item, index) {
+  var seqArray = array.map(function (item, index) {
     var id;
     if (typeof item === 'string') {
       // ensure not empty, since other layers (eg DomRange) assume this as well
diff --git a/packages/observe-sequence/observe_sequence_tests.js b/packages/observe-sequence/observe_sequence_tests.js
index 55ab55e8b..7f62a0f47 100644
--- a/packages/observe-sequence/observe_sequence_tests.js
+++ b/packages/observe-sequence/observe_sequence_tests.js
@@ -20,11 +20,11 @@ runOneObserveSequenceTestCase = function (test, sequenceFunc,
 
   var firedCallbacks = [];
   var handle = ObserveSequence.observe(sequenceFunc, {
-    addedAt: function () {
-      firedCallbacks.push({addedAt: _.toArray(arguments)});
+    addedAt: function (...args) {
+      firedCallbacks.push({addedAt: args});
     },
-    changedAt: function () {
-      var obj = {changedAt: _.toArray(arguments)};
+    changedAt: function (...args) {
+      var obj = {changedAt: args};
 
       // Browsers are inconsistent about the order in which 'changedAt'
       // callbacks fire. To ensure consistent behavior of these tests,
@@ -45,11 +45,11 @@ runOneObserveSequenceTestCase = function (test, sequenceFunc,
 
       firedCallbacks.splice(i, 0, obj);
     },
-    removedAt: function () {
-      firedCallbacks.push({removedAt: _.toArray(arguments)});
+    removedAt: function (...args) {
+      firedCallbacks.push({removedAt: args});
     },
-    movedTo: function () {
-      firedCallbacks.push({movedTo: _.toArray(arguments)});
+    movedTo: function (...args) {
+      firedCallbacks.push({movedTo: args});
     }
   });
 
@@ -69,11 +69,11 @@ runOneObserveSequenceTestCase = function (test, sequenceFunc,
   var commonLength = Math.min(firedCallbacks.length, expectedCallbacks.length);
   for (var i = 0; i < commonLength; i++) {
     var callback = expectedCallbacks[i];
-    if (_.keys(callback).length !== 1)
+    if (Object.keys(callback).length !== 1)
       throw new Error("Callbacks should be objects with one key, eg `addedAt`");
-    var callbackName = _.keys(callback)[0];
-    var args = _.values(callback)[0];
-    _.each(args, function (arg, argIndex) {
+    var callbackName = Object.keys(callback)[0];
+    var args = Object.values(callback)[0];
+    args.forEach(function (arg, argIndex) {
       if (arg && typeof arg === 'object' &&
           'NOT' in arg &&
           firedCallbacks[i][callbackName]) {
@@ -205,6 +205,19 @@ Tinytest.add('observe-sequence - initial data for all sequence types', function
     {addedAt: ["13", {_id: "13", foo: 1}, 0, null]},
     {addedAt: [{NOT: "13"}, {_id: "13", foo: 2}, 1, null]}
   ], /*numExpectedWarnings = */1);
+
+  // non-array iterable (empty)
+  if(typeof Map == 'function') runOneObserveSequenceTestCase(test, function () {
+    return new Map();
+  }, function () {}, []);
+
+  // non-array iterable (non-empty)
+  if(typeof Set == 'function') runOneObserveSequenceTestCase(test, function () {
+    return new Set([{foo: 1}, {bar: 2}]);
+  }, function () {}, [
+    {addedAt: [0, {foo: 1}, 0, null]},
+    {addedAt: [1, {bar: 2}, 1, null]}
+  ]);
 });
 
 Tinytest.add('observe-sequence - array to other array', function (test) {
@@ -544,7 +557,7 @@ Tinytest.add('observe-sequence - cursor to other cursor', function (test) {
 Tinytest.add('observe-sequence - cursor to other cursor with transform', function (test) {
   var dep = new Tracker.Dependency;
   var transform = function(doc) {
-    return _.extend({idCopy: doc._id}, doc);
+    return Object.assign({idCopy: doc._id}, doc);
   };
 
   var coll = new Mongo.Collection(null, {transform: transform});
@@ -678,7 +691,7 @@ Tinytest.add('observe-sequence - vm generated number arrays', function (test) {
 });
 
 Tinytest.add('observe-sequence - number arrays, _id:0 correctly handled, no duplicate ids warning #4049', function (test) {
-  var seq = _.map(_.range(3), function (i) { return { _id: i}; });
+  var seq = [...Array(3).keys()].map(function (i) { return { _id: i}; });
   var dep = new Tracker.Dependency;
 
   runOneObserveSequenceTestCase(test, function () {
@@ -689,7 +702,7 @@ Tinytest.add('observe-sequence - number arrays, _id:0 correctly handled, no dupl
     // _id. An expression like `(item && item._id) || index` would incorrectly
     // return '2' for the last item because the _id is falsy (although it is not
     // undefined, but 0!).
-    seq = _.map([1, 2, 0], function (i) { return { _id: i}; });
+    seq = [1, 2, 0].map(function (i) { return { _id: i}; });
     dep.changed();
   }, [
     {addedAt: [0, {_id: 0}, 0, null]},
diff --git a/packages/observe-sequence/package.js b/packages/observe-sequence/package.js
index dd11afa63..934901033 100644
--- a/packages/observe-sequence/package.js
+++ b/packages/observe-sequence/package.js
@@ -1,13 +1,12 @@
 Package.describe({
   summary: "Observe changes to various sequence types such as arrays, cursors and objects",
-  version: "1.0.19"
+  version: "1.0.20"
 });
 
 Package.onUse(function (api) {
   api.use('tracker@1.2.0');
   api.use('mongo-id@1.0.8');  // for idStringify
   api.use('diff-sequence@1.1.1');
-  api.use('underscore@1.0.10');
   api.use('random@1.2.0');
   api.export('ObserveSequence');
   api.addFiles(['observe_sequence.js']);
@@ -17,7 +16,6 @@ Package.onTest(function (api) {
   api.use([
     'tinytest',
     'observe-sequence',
-    'underscore',
     'ejson',
     'tracker',
     'mongo'
diff --git a/packages/spacebars-compiler/package.js b/packages/spacebars-compiler/package.js
index 7a9ff7d00..1b88b0bb2 100644
--- a/packages/spacebars-compiler/package.js
+++ b/packages/spacebars-compiler/package.js
@@ -1,7 +1,7 @@
 Package.describe({
   name: 'spacebars-compiler',
   summary: "Compiler for Spacebars template language",
-  version: '1.3.0',
+  version: '1.3.1',
   git: 'https://github.com/meteor/blaze.git'
 });
 
@@ -12,9 +12,9 @@ Npm.depends({
 Package.onUse(function (api) {
   api.use('ecmascript@0.15.1');
 
-  api.use('htmljs@1.1.0');
-  api.use('html-tools@1.1.2');
-  api.use('blaze-tools@1.1.2');
+  api.use('htmljs@1.1.1');
+  api.use('html-tools@1.1.3');
+  api.use('blaze-tools@1.1.3');
 
   api.export('SpacebarsCompiler');
 
diff --git a/packages/spacebars/package.js b/packages/spacebars/package.js
index e0ebc0b7f..a9ba4b0e1 100644
--- a/packages/spacebars/package.js
+++ b/packages/spacebars/package.js
@@ -1,7 +1,7 @@
 Package.describe({
   name: 'spacebars',
   summary: "Handlebars-like template language for Meteor",
-  version: '1.2.0',
+  version: '1.3.0',
   git: 'https://github.com/meteor/blaze.git'
 });
 
@@ -19,7 +19,7 @@ Package.onUse(function (api) {
 
   api.export('Spacebars');
 
-  api.use('htmljs@1.1.0');
+  api.use('htmljs@1.1.1');
   api.use('blaze@2.5.0');
 
   api.addFiles([
diff --git a/packages/spacebars/spacebars-runtime.js b/packages/spacebars/spacebars-runtime.js
index a7cebb77d..f02849c8d 100644
--- a/packages/spacebars/spacebars-runtime.js
+++ b/packages/spacebars/spacebars-runtime.js
@@ -278,6 +278,3 @@ Spacebars.With = function (argFunc, contentFunc, elseFunc) {
 
   return view;
 };
-
-// XXX COMPAT WITH 0.9.0
-Spacebars.TemplateWith = Blaze._TemplateWith;
diff --git a/packages/templating-runtime/package.js b/packages/templating-runtime/package.js
index ad5a13dac..e5da34431 100644
--- a/packages/templating-runtime/package.js
+++ b/packages/templating-runtime/package.js
@@ -1,7 +1,7 @@
 Package.describe({
   name: 'templating-runtime',
   summary: "Runtime for compiled .html files",
-  version: '1.5.0',
+  version: '1.6.0',
   git: 'https://github.com/meteor/blaze.git',
   documentation: null
 });
@@ -23,14 +23,14 @@ Package.onUse(function (api) {
   // Blaze, so anybody using templating (eg apps) need to implicitly use
   // 'meteor' and 'blaze'.
   api.use([
-    'blaze@2.5.0',
-    'spacebars@1.2.0',
+    'blaze@2.6.0',
+    'spacebars@1.2.1',
     'ecmascript@0.15.1'
   ]);
   api.imply([
     'meteor@1.2.17', // TODO update
-    'blaze@2.5.0',
-    'spacebars@1.2.0'
+    'blaze@2.6.0',
+    'spacebars@1.2.1'
   ], 'client');
 
   // to be able to compile dynamic.html. this compiler is used
diff --git a/packages/templating-runtime/templating.js b/packages/templating-runtime/templating.js
index 2da2c0056..223226310 100644
--- a/packages/templating-runtime/templating.js
+++ b/packages/templating-runtime/templating.js
@@ -26,18 +26,6 @@ Template.__checkName = function (name) {
   }
 };
 
-// XXX COMPAT WITH 0.8.3
-Template.__define__ = function (name, renderFunc) {
-  Template.__checkName(name);
-  Template[name] = new Template("Template." + name, renderFunc);
-  // Exempt packages built pre-0.9.0 from warnings about using old
-  // helper syntax, because we can.  It's not very useful to get a
-  // warning about someone else's code (like a package on Atmosphere),
-  // and this should at least put a bit of a dent in number of warnings
-  // that come from packages that haven't been updated lately.
-  Template[name]._NOWARN_OLDSTYLE_HELPERS = true;
-};
-
 // Define a template `Template.body` that renders its
 // `contentRenderFuncs`.  `<body>` tags (of which there may be
 // multiple) will have their contents added to it.
@@ -175,12 +163,3 @@ Template._migrateTemplate = function (templateName, newTemplate, migrate) {
   Template.__checkName(templateName);
   Template[templateName] = newTemplate;
 };
-
-// XXX COMPAT WITH 0.9.0
-UI.body = Template.body;
-
-// XXX COMPAT WITH 0.9.0
-// (<body> tags in packages built with 0.9.0)
-Template.__body__ = Template.body;
-Template.__body__.__contentParts = Template.body.contentViews;
-Template.__body__.__instantiate = Template.body.renderToDocument;
diff --git a/packages/templating-tools/package.js b/packages/templating-tools/package.js
index afdb5d168..bba37aedb 100644
--- a/packages/templating-tools/package.js
+++ b/packages/templating-tools/package.js
@@ -1,7 +1,7 @@
 Package.describe({
   name: 'templating-tools',
   summary: "Tools to scan HTML and compile tags when building a templating package",
-  version: '1.2.1',
+  version: '1.2.2',
   git: 'https://github.com/meteor/blaze.git'
 });
 
@@ -17,7 +17,7 @@ Package.onUse(function(api) {
   api.export('TemplatingTools');
 
   api.use([
-    'spacebars-compiler@1.3.0'
+    'spacebars-compiler@1.3.1'
   ]);
 
   api.mainModule('templating-tools.js');
diff --git a/packages/templating/package.js b/packages/templating/package.js
index 00451744d..9fe1b9b06 100644
--- a/packages/templating/package.js
+++ b/packages/templating/package.js
@@ -1,7 +1,7 @@
 Package.describe({
   name: 'templating',
   summary: "Allows templates to be defined in .html files",
-  version: '1.4.1',
+  version: '1.4.2',
   git: 'https://github.com/meteor/blaze.git'
 });
 
@@ -13,7 +13,7 @@ Package.describe({
 Package.onUse(function (api) {
   api.export('Template', 'client');
 
-  api.use('templating-runtime@1.5.0');
+  api.use('templating-runtime@1.6.0');
   api.imply('templating-runtime');
 
   api.imply('templating-compiler@1.4.1');
diff --git a/publish-all.sh b/publish-all.sh
index afe09173f..0960fa882 100755
--- a/publish-all.sh
+++ b/publish-all.sh
@@ -4,7 +4,7 @@ set -e
 set -u
 
 # the order is important
-for package in htmljs html-tools blaze-tools spacebars-compiler templating-tools caching-html-compiler static-html blaze spacebars templating-compiler templating-runtime blaze-hot templating spacebars-tests blaze-html-templates ; do
+for package in htmljs html-tools blaze-tools spacebars-compiler templating-tools caching-html-compiler observe-sequence blaze spacebars templating-compiler templating-runtime blaze-hot templating spacebars-tests blaze-html-templates ; do
   echo "Publishing $package"
   (cd packages/$package && meteor publish)
 done
diff --git a/test-app/.meteor/packages b/test-app/.meteor/packages
index c5dacff3f..668d61eaa 100644
--- a/test-app/.meteor/packages
+++ b/test-app/.meteor/packages
@@ -4,16 +4,16 @@
 # 'meteor add' and 'meteor remove' will edit this file for you,
 # but you can also edit it by hand.
 
-meteor-base@1.4.0             # Packages every Meteor app needs to have
+meteor-base@1.5.1             # Packages every Meteor app needs to have
 mobile-experience@1.1.0       # Packages for a great mobile UX
-mongo@1.11.0                   # The database Meteor supports right now
-static-html             # Define static page content in .html files
+mongo@1.14.6                   # The database Meteor supports right now
+static-html@1.3.2             # Define static page content in .html files
 reactive-var@1.0.11            # Reactive variable for tracker
 tracker@1.2.0                 # Meteor's client-side reactive programming library
 
-standard-minifier-css@1.7.2   # CSS minifier run for production mode
-standard-minifier-js@2.6.0    # JS minifier run for production mode
+standard-minifier-css@1.8.1   # CSS minifier run for production mode
+standard-minifier-js@2.8.0    # JS minifier run for production mode
 es5-shim@4.8.0                # ECMAScript 5 compatibility for older browsers
-ecmascript@0.15.1              # Enable ECMAScript2015+ syntax in app code
-typescript@4.2.2              # Enable TypeScript syntax in .ts and .tsx modules
+ecmascript@0.16.2              # Enable ECMAScript2015+ syntax in app code
+typescript@4.5.4              # Enable TypeScript syntax in .ts and .tsx modules
 shell-server@0.5.0            # Server-side component of the `meteor shell` command
diff --git a/test-app/.meteor/release b/test-app/.meteor/release
index 59245ca5f..8e3f1708a 100644
--- a/test-app/.meteor/release
+++ b/test-app/.meteor/release
@@ -1 +1 @@
-METEOR@2.2.1
+METEOR@2.7.1
diff --git a/test-app/.meteor/versions b/test-app/.meteor/versions
index 6323f5c34..0876ac00b 100644
--- a/test-app/.meteor/versions
+++ b/test-app/.meteor/versions
@@ -1,6 +1,6 @@
-allow-deny@1.1.0
-autoupdate@1.7.0
-babel-compiler@7.6.2
+allow-deny@1.1.1
+autoupdate@1.8.0
+babel-compiler@7.9.0
 babel-runtime@1.5.0
 base64@1.0.12
 binary-heap@1.0.11
@@ -8,19 +8,19 @@ blaze-tools@1.1.2
 boilerplate-generator@1.7.1
 caching-compiler@1.2.2
 caching-html-compiler@1.2.1
-callback-hook@1.3.0
+callback-hook@1.4.0
 check@1.3.1
 ddp@1.4.0
-ddp-client@2.4.1
+ddp-client@2.5.0
 ddp-common@1.4.0
-ddp-server@2.3.3
+ddp-server@2.5.0
 diff-sequence@1.1.1
-dynamic-import@0.6.0
-ecmascript@0.15.1
-ecmascript-runtime@0.7.0
-ecmascript-runtime-client@0.11.1
-ecmascript-runtime-server@0.10.1
-ejson@1.1.1
+dynamic-import@0.7.2
+ecmascript@0.16.2
+ecmascript-runtime@0.8.0
+ecmascript-runtime-client@0.12.1
+ecmascript-runtime-server@0.11.0
+ejson@1.1.2
 es5-shim@4.8.0
 fetch@0.1.1
 geojson-utils@1.0.10
@@ -29,41 +29,40 @@ html-tools@1.1.2
 htmljs@1.1.1
 id-map@1.1.1
 inter-process-messaging@0.1.1
-launch-screen@1.2.1
-livedata@1.0.18
-logging@1.2.0
-meteor@1.9.3
-meteor-base@1.4.0
-minifier-css@1.5.4
-minifier-js@2.6.0
-minimongo@1.6.2
+launch-screen@1.3.0
+logging@1.3.1
+meteor@1.10.0
+meteor-base@1.5.1
+minifier-css@1.6.0
+minifier-js@2.7.4
+minimongo@1.8.0
 mobile-experience@1.1.0
 mobile-status-bar@1.1.0
-modern-browsers@0.1.5
-modules@0.16.0
-modules-runtime@0.12.0
-mongo@1.11.1
+modern-browsers@0.1.7
+modules@0.18.0
+modules-runtime@0.13.0
+mongo@1.14.6
 mongo-decimal@0.1.2
 mongo-dev-server@1.1.0
 mongo-id@1.0.8
-npm-mongo@3.9.0
+npm-mongo@4.3.1
 ordered-dict@1.1.0
-promise@0.11.2
+promise@0.12.0
 random@1.2.0
-react-fast-refresh@0.1.1
+react-fast-refresh@0.2.3
 reactive-var@1.0.11
 reload@1.3.1
 retry@1.1.0
-routepolicy@1.1.0
+routepolicy@1.1.1
 shell-server@0.5.0
-socket-stream-client@0.3.3
+socket-stream-client@0.4.0
 spacebars-compiler@1.3.0
-standard-minifier-css@1.7.3
-standard-minifier-js@2.6.1
+standard-minifier-css@1.8.1
+standard-minifier-js@2.8.0
 static-html@1.3.2
 templating-tools@1.2.1
 tracker@1.2.0
-typescript@4.2.2
+typescript@4.5.4
 underscore@1.0.10
-webapp@1.10.1
+webapp@1.13.1
 webapp-hashing@1.1.0
diff --git a/test-app/package.json b/test-app/package.json
index 941a15a0f..457975df6 100644
--- a/test-app/package.json
+++ b/test-app/package.json
@@ -13,9 +13,9 @@
   },
   "license": "MIT",
   "dependencies": {
+    "@babel/runtime": "^7.17.9",
     "jquery": "^3.6.0",
-    "@babel/runtime": "^7.15.3",
-    "meteor-node-stubs": "^1.1.0",
-    "puppeteer": "^8.0.0"
+    "meteor-node-stubs": "^1.2.1",
+    "puppeteer": "^10.4.0"
   }
 }