diff --git a/CHANGES.md b/CHANGES.md
index 769572c..3b7cbe9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,8 @@
 #### [unreleased]
+
+#### 2.0.1 / 2019-01-11
 * added `composer.json` and automatically create POT with `composer update`
+* added check for `register_block_type()` for WP 4.9.x and below
 
 #### 2.0.0 / 2018-12-20 🎂
 * a proper PDF block was added with much help from [Alex Kirk](https://github.com/akirk), many thanks
diff --git a/embed-pdf-viewer.php b/embed-pdf-viewer.php
index 7a355da..0b839fe 100644
--- a/embed-pdf-viewer.php
+++ b/embed-pdf-viewer.php
@@ -5,7 +5,7 @@
  * Description:       Embed a PDF from the Media Library or elsewhere via oEmbed or as a block into an `object` tag or Google Doc Viewer as fallback.
  * Author:            Andy Fragen
  * Author URI:        https://github.com/afragen
- * Version:           2.0.0.1
+ * Version:           2.0.1
  * License:           GPLv2+
  * Domain Path:       /languages
  * Text Domain:       embed-pdf-viewer
@@ -50,13 +50,14 @@ function() {
 			array( 'wp-blocks', 'wp-element' )
 		);
 
-		register_block_type(
-			'embed-pdf-viewer/index',
-			array(
-				'editor_script' => 'embed-pdf-viewer',
-			)
-		);
-
+		if ( function_exists( 'register_block_type' ) ) {
+			register_block_type(
+				'embed-pdf-viewer/index',
+				array(
+					'editor_script' => 'embed-pdf-viewer',
+				)
+			);
+		}
 	}
 );
 
diff --git a/languages/embed-pdf-viewer.pot b/languages/embed-pdf-viewer.pot
index 887a5b7..207f1a4 100644
--- a/languages/embed-pdf-viewer.pot
+++ b/languages/embed-pdf-viewer.pot
@@ -2,14 +2,14 @@
 # This file is distributed under the same license as the Embed PDF Viewer plugin.
 msgid ""
 msgstr ""
-"Project-Id-Version: Embed PDF Viewer 2.0.0.1\n"
+"Project-Id-Version: Embed PDF Viewer 2.0.1\n"
 "Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/embed-pdf-viewer\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"POT-Creation-Date: 2019-01-02T19:26:00+00:00\n"
+"POT-Creation-Date: 2019-01-11T16:02:16+00:00\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "X-Generator: WP-CLI 2.1.0\n"
 "X-Domain: embed-pdf-viewer\n"
diff --git a/readme.txt b/readme.txt
index 8a9f467..85b25a3 100644
--- a/readme.txt
+++ b/readme.txt
@@ -5,7 +5,7 @@ Tags: pdf, embed, oembed, viewer, block
 Requires at least: 5.0
 Tested up to: 5.0
 Requires PHP: 5.6
-Stable tag: 2.0.0
+Stable tag: 2.0.1
 License: GPL v2+
 License URI: <https://www.gnu.org/licenses/gpl-2.0.html>
 
@@ -22,6 +22,10 @@ Development on [GitHub](https://github.com/afragen/embed-pdf-viewer). Pull reque
 
 ## Changelog
 
+#### 2.0.1 / 2019-01-11
+* added `composer.json` and automatically create POT with `composer update`
+* added check for `register_block_type()` for WP 4.9.x and below
+
 #### 2.0.0 / 2018-12-20 🎂
 * a proper PDF block was added with much help from [Alex Kirk](https://github.com/akirk), many thanks