diff --git a/README.md b/README.md
index 8c9313630..34b6afd7e 100644
--- a/README.md
+++ b/README.md
@@ -13,13 +13,13 @@ See the [Wiki](https://github.com/igvteam/igv.js/wiki) for more documentation.
  
 # Examples
  
-***[Alignments](https://igv.org/web/release/2.2.12/examples/cram.html)***
+***[Alignments](https://igv.org/web/release/2.2.13/examples/cram.html)***
 
-***[Copy number](https://igv.org/web/release/2.2.12/examples/copyNumber.html)***
+***[Copy number](https://igv.org/web/release/2.2.13/examples/copyNumber.html)***
 
-***[Multiple regions](https://igv.org/web/release/2.2.12/examples/multi-locus.html)***
+***[Multiple regions](https://igv.org/web/release/2.2.13/examples/multi-locus.html)***
 
-***[More](https://igv.org/web/release/2.2.12/examples/)***
+***[More](https://igv.org/web/release/2.2.13/examples/)***
 
  
 # Quickstart
@@ -28,11 +28,11 @@ See the [Wiki](https://github.com/igvteam/igv.js/wiki) for more documentation.
 igv.js consists of a single javascript file with no external dependencies.  To link directly to the current release copy this snippet
 
 ```html
-<script src="https://cdn.jsdelivr.net/npm/igv@2.2.12/dist/igv.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/igv@2.2.13/dist/igv.min.js"></script>
 ``` 
 
 Pre-built files for ES5 (igv.min.js) and ES6 (igv.esm.min.js)
-can be downloaded from [https://cdn.jsdelivr.net/npm/igv@2.2.12/dist/](https://cdn.jsdelivr.net/npm/igv@2.2.12/dist/).   
+can be downloaded from [https://cdn.jsdelivr.net/npm/igv@2.2.13/dist/](https://cdn.jsdelivr.net/npm/igv@2.2.13/dist/).   
  
 Alternatively you can install with npm  
  
@@ -46,11 +46,11 @@ To use igv.js include it with a script tag
 
 ***or*** import it as a requirejs module 
 
-```requirejs(['igv.min'], function (igv) {...}```   *(see [examples/igv-require.html](https://cdn.jsdelivr.net/npm/igv@2.2.12/examples/igv-require.html))*
+```requirejs(['igv.min'], function (igv) {...}```   *(see [examples/igv-require.html](https://cdn.jsdelivr.net/npm/igv@2.2.13/examples/igv-require.html))*
 
 ***or*** import it as an es6 module 
 
-```import igv from 'igv.esm.min.js'```  *(see [examples/igv-esm.html](https://cdn.jsdelivr.net/npm/igv@2.2.12/examples/igv-esm.html))*
+```import igv from 'igv.esm.min.js'```  *(see [examples/igv-esm.html](https://cdn.jsdelivr.net/npm/igv@2.2.13/examples/igv-esm.html))*
 
 
 
diff --git a/js/igvxhr.js b/js/igvxhr.js
index 3afe0b1d1..d6af6369b 100644
--- a/js/igvxhr.js
+++ b/js/igvxhr.js
@@ -22,6 +22,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+"use strict";
 
 var igv = (function (igv) {
 
diff --git a/package.json b/package.json
index d8211a9c9..0637bdae9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "igv",
-  "version": "2.2.12",
+  "version": "2.2.13",
   "description": "Embeddable genomic visualization component based on the Integrative Genomics Viewer",
   "main": "dist/igv.esm.js",
   "files": [