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  <div class="section" id="upgrading-from-1-3-3-to-1-4-0">
<h1>Upgrading from 1.3.3 to 1.4.0<a class="headerlink" href="#upgrading-from-1-3-3-to-1-4-0" title="Permalink to this headline">¶</a></h1>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The instructions on this page assume you are running version
1.3.3. If you have not upgraded to that version please do so first.</p>
</div>
<p>Before performing an update you should take your site offline by
replacing the index.php file with a static one.</p>
<div class="section" id="step-1-update-your-codeigniter-files">
<h2>Step 1: Update your CodeIgniter files<a class="headerlink" href="#step-1-update-your-codeigniter-files" title="Permalink to this headline">¶</a></h2>
<p>Replace the following directories in your “system” folder with the new
versions:</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If you have any custom developed files in these folders please
make copies of them first.</p>
</div>
<ul class="simple">
<li>application/config/<strong>hooks.php</strong></li>
<li>application/config/<strong>mimes.php</strong></li>
<li>codeigniter</li>
<li>drivers</li>
<li>helpers</li>
<li>init</li>
<li>language</li>
<li>libraries</li>
<li>scaffolding</li>
</ul>
</div>
<div class="section" id="step-2-update-your-config-php-file">
<h2>Step 2: Update your config.php file<a class="headerlink" href="#step-2-update-your-config-php-file" title="Permalink to this headline">¶</a></h2>
<p>Open your application/config/config.php file and add these new items:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="cm">/*</span>
<span class="cm">|--------------------------------------------------------------------------</span>
<span class="cm">| Enable/Disable System Hooks</span>
<span class="cm">|--------------------------------------------------------------------------</span>
<span class="cm">|</span>
<span class="cm">| If you would like to use the &quot;hooks&quot; feature you must enable it by</span>
<span class="cm">| setting this variable to TRUE (boolean).  See the user guide for details.</span>
<span class="cm">|</span>
<span class="cm">*/</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;enable_hooks&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">FALSE</span><span class="p">;</span>

<span class="cm">/*</span>
<span class="cm">|--------------------------------------------------------------------------</span>
<span class="cm">| Allowed URL Characters</span>
<span class="cm">|--------------------------------------------------------------------------</span>
<span class="cm">|</span>
<span class="cm">| This lets you specify which characters are permitted within your URLs.</span>
<span class="cm">| When someone tries to submit a URL with disallowed characters they will</span>
<span class="cm">| get a warning message.</span>
<span class="cm">|</span>
<span class="cm">| As a security measure you are STRONGLY encouraged to restrict URLs to</span>
<span class="cm">| as few characters as possible.  By default only these are allowed: a-z 0-9~%.:_-</span>
<span class="cm">|</span>
<span class="cm">| Leave blank to allow all characters -- but only if you are insane.</span>
<span class="cm">|</span>
<span class="cm">| DO NOT CHANGE THIS UNLESS YOU FULLY UNDERSTAND THE REPERCUSSIONS!!</span>
<span class="cm">|</span>
<span class="cm">*/</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;permitted_uri_chars&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;a-z 0-9~%.:_-&#39;</span><span class="p">;</span>
</pre></div>
</div>
</div>
<div class="section" id="step-3-update-your-user-guide">
<h2>Step 3: Update your user guide<a class="headerlink" href="#step-3-update-your-user-guide" title="Permalink to this headline">¶</a></h2>
<p>Please also replace your local copy of the user guide with the new
version.</p>
</div>
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