diff --git a/packages/babel-compiler/package.js b/packages/babel-compiler/package.js
index c40bcb4ee0..bab25ee049 100644
--- a/packages/babel-compiler/package.js
+++ b/packages/babel-compiler/package.js
@@ -6,7 +6,7 @@ Package.describe({
   // isn't possible because you can't publish a non-recommended
   // release with package versions that don't have a pre-release
   // identifier at the end (eg, -dev)
-  version: '6.8.3'
+  version: '6.8.3-rc.0'
 });
 
 Npm.depends({
diff --git a/packages/coffeescript/package.js b/packages/coffeescript/package.js
index babf6d718d..19e8732ac2 100644
--- a/packages/coffeescript/package.js
+++ b/packages/coffeescript/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   summary: "Javascript dialect with fewer braces and semicolons",
-  version: "1.1.1"
+  version: "1.1.2-rc.0"
 });
 
 Package.registerBuildPlugin({
diff --git a/packages/ecmascript/package.js b/packages/ecmascript/package.js
index b49194bc83..2edabb67c7 100644
--- a/packages/ecmascript/package.js
+++ b/packages/ecmascript/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   name: 'ecmascript',
-  version: '0.4.5',
+  version: '0.4.6-rc.0',
   summary: 'Compiler plugin that supports ES2015+ in all .js files',
   documentation: 'README.md'
 });
diff --git a/packages/http/package.js b/packages/http/package.js
index 825793ef26..1517439db5 100644
--- a/packages/http/package.js
+++ b/packages/http/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   summary: "Make HTTP calls to remote servers",
-  version: '1.1.7'
+  version: '1.1.7-rc.0'
 });
 
 Npm.depends({
diff --git a/packages/less/package.js b/packages/less/package.js
index 0c2a9b4d17..1562074194 100644
--- a/packages/less/package.js
+++ b/packages/less/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   name: 'less',
-  version: '2.6.2',
+  version: '2.6.3-rc.0',
   summary: 'Leaner CSS language',
   documentation: 'README.md'
 });
diff --git a/packages/meteor-tool/package.js b/packages/meteor-tool/package.js
index 475a746ff3..70d3aa606e 100644
--- a/packages/meteor-tool/package.js
+++ b/packages/meteor-tool/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   summary: "The Meteor command-line tool",
-  version: '1.3.3_1'
+  version: '1.3.4-rc.0'
 });
 
 Package.includeTool();
diff --git a/packages/modules/package.js b/packages/modules/package.js
index f445ac250c..91c125b5c7 100644
--- a/packages/modules/package.js
+++ b/packages/modules/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   name: "modules",
-  version: "0.6.4",
+  version: "0.6.4-rc.0",
   summary: "CommonJS module system",
   documentation: "README.md"
 });
diff --git a/packages/static-html/package.js b/packages/static-html/package.js
index aa859a5bfd..1956afc931 100644
--- a/packages/static-html/package.js
+++ b/packages/static-html/package.js
@@ -1,5 +1,5 @@
 Package.describe({
-  version: '1.0.9',
+  version: '1.0.10-rc.0',
   // Brief, one-line summary of the package.
   summary: 'Define static page content in .html files',
   git: 'https://github.com/meteor/meteor',
diff --git a/packages/stylus/package.js b/packages/stylus/package.js
index 341d97bc04..e281d53dbd 100644
--- a/packages/stylus/package.js
+++ b/packages/stylus/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   summary: 'Expressive, dynamic, robust CSS',
-  version: "2.512.2"
+  version: "2.512.3-rc.0"
 });
 
 Package.registerBuildPlugin({
diff --git a/packages/templating/package.js b/packages/templating/package.js
index e3870cfef7..4ea79c7bdb 100644
--- a/packages/templating/package.js
+++ b/packages/templating/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   summary: "Allows templates to be defined in .html files",
-  version: '1.1.11'
+  version: '1.1.12-rc.0'
 });
 
 // Today, this package is closely intertwined with Handlebars, meaning
diff --git a/scripts/admin/meteor-release-experimental.json b/scripts/admin/meteor-release-experimental.json
index 485570cc95..8675f311ba 100644
--- a/scripts/admin/meteor-release-experimental.json
+++ b/scripts/admin/meteor-release-experimental.json
@@ -1,6 +1,6 @@
 {
  "track": "METEOR",
- "version": "1.3.3.1-rc.2",
+ "version": "1.3.4-rc.0",
  "recommended": false,
  "official": false,
  "description": "Meteor"