diff --git a/README.md b/README.md
index a51d4bf1..53485a9f 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ const RENDER_OPTIONS = {
   rotate: 0
 };
 
-pdfjsLib.workerSrc = 'pdf.worker.js';
+pdfjsLib.GlobalWorkerOptions.workerSrc = 'pdf.worker.js';
 PDFJSAnnotate.setStoreAdapter(PDFJSAnnotate.LocalStoreAdapter);
 
 pdfjsLib.getDocument(RENDER_OPTIONS.documentId).promise.then((pdf) => {
diff --git a/sandbox/basic/index.js b/sandbox/basic/index.js
index 94acfc1e..04bd9e89 100644
--- a/sandbox/basic/index.js
+++ b/sandbox/basic/index.js
@@ -3,7 +3,7 @@ import annotations from './annotations';
 
 const DOCUMENT_ID = 'PDFJSAnnotate.pdf';
 
-pdfjsViewer.workerSrc = '../shared/pdf.worker.js';
+pdfjsViewer.GlobalWorkerOptions.workerSrc = '../shared/pdf.worker.js';
 
 PDFJSAnnotate.StoreAdapter.getAnnotations = (documentId, pageNumber) => {
   return new Promise((resolve, reject) => {
diff --git a/web/index.js b/web/index.js
index 907c80ab..73cb41db 100644
--- a/web/index.js
+++ b/web/index.js
@@ -21,7 +21,7 @@ let RENDER_OPTIONS = {
 };
 
 PDFJSAnnotate.setStoreAdapter(new PDFJSAnnotate.LocalStoreAdapter());
-pdfjsLib.workerSrc = './shared/pdf.worker.js';
+pdfjsLib.GlobalWorkerOptions.workerSrc = './shared/pdf.worker.js';
 
 // Render stuff
 let NUM_PAGES = 0;