diff --git a/README.md b/README.md
index d3a028a..86f862a 100644
--- a/README.md
+++ b/README.md
@@ -10,11 +10,11 @@ To get started with Emscripten development, grab one of the packages below:
 
 Windows:
 * Emscripten SDK Web Installer is a NSIS installer that always gets you the latest Emscripten SDK from the web:
-  * [emsdk-1.30.0-web-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.30.0-web-64bit.exe)
+  * [emsdk-1.34.1-web-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.34.1-web-64bit.exe)
 * Emscripten SDK Offline Installer is a NSIS installer that bundles together the Emscripten toolchain as an offline-installable package:
-  * [emsdk-1.30.0-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.30.0-full-64bit.exe)
+  * [emsdk-1.34.1-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.34.1-full-64bit.exe)
 * Portable Emscripten SDK is a zipped package of the Emscripten SDK that does not require system installation privileges. Just unzip and go:
-  * [emsdk-1.30.0-portable-64bit.zip](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.30.0-portable-64bit.zip)
+  * [emsdk-1.34.1-portable-64bit.zip](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.34.1-portable-64bit.zip)
 
 Linux and Mac OS X:
 * [emsdk-portable.tar.gz](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz): Emscripten SDK is available as a portable web-installer for Linux and OS X.
@@ -209,5 +209,6 @@ On Windows, you can install one of the **old versions** via an offline NSIS inst
  - [emsdk-1.22.0-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.22.0-full-64bit.exe)
  - [emsdk-1.25.0-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.25.0-full-64bit.exe)
  - [emsdk-1.27.0-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.27.0-full-64bit.exe) (last release based on Clang 3.3)
- - [emsdk-1.29.0-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.29.0-full-64bit.exe) (first and last release based on Clang 3.4)
- - [emsdk-1.30.0-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.30.0-full-64bit.exe) (first and last release based on Clang 3.5)
+ - [emsdk-1.29.0-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.29.0-full-64bit.exe) (the only release based on Clang 3.4)
+ - [emsdk-1.30.0-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.30.0-full-64bit.exe) (the only release based on Clang 3.5)
+ - [emsdk-1.34.1-full-64bit.exe](https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-1.30.0-full-64bit.exe) (first release based on Clang 3.7)
diff --git a/emsdk_manifest.json b/emsdk_manifest.json
index 0f69f4d..cb4fa0b 100644
--- a/emsdk_manifest.json
+++ b/emsdk_manifest.json
@@ -211,7 +211,8 @@
     "windows_url": "emscripten-clang_e1.29.0.zip",
     "osx_url": "emscripten-clang_e1.29.0.tar.gz",
     "activated_path": "%installation_dir%",
-    "activated_cfg": "LLVM_ROOT='%installation_dir%';EMSCRIPTEN_NATIVE_OPTIMIZER='%installation_dir%/optimizer%.exe%'"
+    "activated_cfg": "LLVM_ROOT='%installation_dir%';EMSCRIPTEN_NATIVE_OPTIMIZER='%installation_dir%/optimizer%.exe%'",
+    "is_old": true
   },
   {
     "id": "clang",
@@ -222,6 +223,15 @@
     "activated_path": "%installation_dir%",
     "activated_cfg": "LLVM_ROOT='%installation_dir%';EMSCRIPTEN_NATIVE_OPTIMIZER='%installation_dir%/optimizer%.exe%'"
   },
+  {
+    "id": "clang",
+    "version": "e1.34.1",
+    "bitness": 64,
+    "windows_url": "emscripten-clang_e1.34.1.zip",
+    "osx_url": "emscripten-clang_e1.34.1.tar.gz",
+    "activated_path": "%installation_dir%",
+    "activated_cfg": "LLVM_ROOT='%installation_dir%';EMSCRIPTEN_NATIVE_OPTIMIZER='%installation_dir%/optimizer%.exe%'"
+  },
   {
     "id": "node",
     "version": "0.10.17",
@@ -539,7 +549,8 @@
     "unix_url": "emscripten-1.29.0.tar.gz",
     "activated_cfg": "EMSCRIPTEN_ROOT='%installation_dir%'",
     "activated_path": "%installation_dir%",
-    "activated_env": "EMSCRIPTEN=%installation_dir%"
+    "activated_env": "EMSCRIPTEN=%installation_dir%",
+    "is_old": true
   },
   {
     "id": "emscripten",
@@ -550,6 +561,15 @@
     "activated_path": "%installation_dir%",
     "activated_env": "EMSCRIPTEN=%installation_dir%"
   },
+  {
+    "id": "emscripten",
+    "version": "1.34.1",
+    "windows_url": "emscripten-1.34.1.zip",
+    "unix_url": "emscripten-1.34.1.tar.gz",
+    "activated_cfg": "EMSCRIPTEN_ROOT='%installation_dir%'",
+    "activated_path": "%installation_dir%",
+    "activated_env": "EMSCRIPTEN=%installation_dir%"
+  },
   {
     "id": "emscripten",
     "version": "tag-%tag%",
@@ -1009,13 +1029,15 @@
     "version": "1.29.0",
     "bitness": 64,
     "uses": ["clang-e1.29.0-64bit", "node-0.10.17-64bit", "python-2.7.5.3-64bit", "emscripten-1.29.0"],
-    "os": "win"
+    "os": "win",
+    "is_old": true
   },
   {
     "version": "1.29.0",
     "bitness": 64,
     "uses": ["clang-e1.29.0-64bit", "node-0.10.18-64bit", "emscripten-1.29.0"],
-    "os": "osx"
+    "os": "osx",
+    "is_old": true
   },
   {
     "version": "1.30.0",
@@ -1029,6 +1051,18 @@
     "uses": ["clang-e1.30.0-64bit", "node-0.12.2-64bit", "emscripten-1.30.0"],
     "os": "osx"
   },
+  {
+    "version": "1.34.1",
+    "bitness": 64,
+    "uses": ["clang-e1.34.1-64bit", "node-0.12.2-64bit", "python-2.7.5.3-64bit", "emscripten-1.34.1"],
+    "os": "win"
+  },
+  {
+    "version": "1.34.1",
+    "bitness": 64,
+    "uses": ["clang-e1.34.1-64bit", "node-0.12.2-64bit", "emscripten-1.34.1"],
+    "os": "osx"
+  },
   {
     "version": "tag-%tag%",
     "bitness": 32,