diff --git a/acorn.js b/acorn.js
index 0f11931752..cf598f860c 100644
--- a/acorn.js
+++ b/acorn.js
@@ -27,7 +27,7 @@
 })(this, function(exports) {
   "use strict";
 
-  exports.version = "0.4.1";
+  exports.version = "0.5.0";
 
   // The main exported interface (under `self.acorn` when in the
   // browser) is a `parse` function that takes a code string and
diff --git a/index.html b/index.html
index f189721410..198882659c 100644
--- a/index.html
+++ b/index.html
@@ -21,7 +21,7 @@ with a <a href="acorn_loose.js">error-tolerant parser</a> and an
 <span class="p">})(</span><span class="k">this</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">exports</span><span class="p">)</span> <span class="p">{</span>
   <span class="s2">&quot;use strict&quot;</span><span class="p">;</span>
 
-  <span class="nx">exports</span><span class="p">.</span><span class="nx">version</span> <span class="o">=</span> <span class="s2">&quot;0.4.1&quot;</span><span class="p">;</span></pre></div>             </td>           </tr>                               <tr id="section-2">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-2">&#182;</a>               </div>               <p>The main exported interface (under <code>self.acorn</code> when in the
+  <span class="nx">exports</span><span class="p">.</span><span class="nx">version</span> <span class="o">=</span> <span class="s2">&quot;0.5.0&quot;</span><span class="p">;</span></pre></div>             </td>           </tr>                               <tr id="section-2">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-2">&#182;</a>               </div>               <p>The main exported interface (under <code>self.acorn</code> when in the
 browser) is a <code>parse</code> function that takes a code string and
 returns an abstract syntax tree as specified by <a href="https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API">Mozilla parser
 API</a>, with the caveat that the SpiderMonkey-specific syntax
diff --git a/package.json b/package.json
index e51f64a469..b5b3e7c608 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
     "description": "ECMAScript parser",
     "homepage": "http://marijnhaverbeke.nl/acorn/",
     "main": "acorn.js",
-    "version": "0.4.2",
+    "version": "0.5.0",
     "engines": {"node": ">=0.4.0"},
     "maintainers": [{"name": "Marijn Haverbeke",
                      "email": "marijnh@gmail.com",