Exclude Current Post from Query

I have a sidebar that is pulling in related blog posts by tags but it is showing the current post in the sidebar instead of just pulling two random posts.

Sample page: http://staging.rswcreative.com/four-signs-that-mobile-learning-is-on-the-rise/

This is the code that I think needs to be edited.

<aside id="news-entry-sidebar">
           <div id="related-case-header">Related Case Studies</div>
		<?php
		$posttags = get_the_tags();
		$test = '';
		$sep = '';
		if ($posttags) {
			foreach($posttags as $tag) {
				$test .= $sep . $tag->name;
				$sep = ",";
			}
		}
		query_posts('tag=' .$test . '&showposts=1'); while (have_posts()) : the_post(); ?>
		<div class="post-page-work-entry">
			<?php the_post_thumbnail(); ?>
			<p style="line-height: 110%;"><?php the_field('client'); ?><br />
			<?php the_title(); ?><br />
			<span style="color: #888888; font-size: 16px;"><?php the_field('project_type'); ?></span></p>
			<p class="post-page-work-entry-excerpt"><?php the_excerpt(); ?><a href="<?php the_permalink(); ?>"></a></p>
		</div>

		<?php endwhile; wp_reset_query(); ?>

        </aside>