diff --git a/content-featured.php b/content-featured.php
index 346d36b..06da21f 100644
--- a/content-featured.php
+++ b/content-featured.php
@@ -11,7 +11,7 @@
 			<?php if ( has_post_thumbnail() ): ?>
 				<?php the_post_thumbnail('minimer-medium'); ?>
 			<?php else: ?>
-				<img src="<?php echo get_template_directory_uri(); ?>/img/thumb-medium.png" alt="<?php the_title_attribute(); ?>" />
+				<img src="<?php echo esc_url( get_template_directory_uri() ); ?>/img/thumb-medium.png" alt="<?php the_title_attribute(); ?>" />
 			<?php endif; ?>
 			<?php if ( has_post_format('video') && !is_sticky() ) echo'<span class="thumb-icon"><i class="fas fa-play"></i></span>'; ?>
 			<?php if ( has_post_format('audio') && !is_sticky() ) echo'<span class="thumb-icon"><i class="fas fa-volume-up"></i></span>'; ?>
diff --git a/inc/related-posts.php b/inc/related-posts.php
index 4deb67d..22b1074 100644
--- a/inc/related-posts.php
+++ b/inc/related-posts.php
@@ -17,7 +17,7 @@
 					<?php if ( has_post_thumbnail() ): ?>
 						<?php the_post_thumbnail('minimer-medium'); ?>
 					<?php elseif ( get_theme_mod('placeholder') != 'off' ): ?>
-						<img src="<?php echo get_template_directory_uri(); ?>/img/thumb-medium.png" alt="<?php the_title_attribute(); ?>" />
+						<img src="<?php echo esc_url( get_template_directory_uri() ); ?>/img/thumb-medium.png" alt="<?php the_title_attribute(); ?>" />
 					<?php endif; ?>
 					<?php if ( has_post_format('video') && !is_sticky() ) echo'<span class="thumb-icon small"><i class="fas fa-play"></i></span>'; ?>
 					<?php if ( has_post_format('audio') && !is_sticky() ) echo'<span class="thumb-icon small"><i class="fas fa-volume-up"></i></span>'; ?>
diff --git a/style.css b/style.css
index 0652bbc..fecb14a 100644
--- a/style.css
+++ b/style.css
@@ -4,6 +4,7 @@ Theme URI: http://alx.media/themes/minimer/
 Version: 1.2.0
 Requires at least: 5.0
 Requires PHP: 5.6
+Tested up to: 5.5
 Description: <a href="http://alx.media/themes/minimer/">Minimer</a> is a flexible personal blog theme with plenty of options. Optimized for all devices, this theme will stand out with a unique slanted sidebar including profile image, name and description. It also includes a featured posts carousel that can be enabled. Set the theme to any width and boxed style if you so wish. Use a sidebar to the left or right, set it to any color you want, or disable it entirely for a more clean look. Demo: http://demo.alx.media/x/?theme=Minimer
 Author: Alexander Agnarson
 Author URI: http://alx.media