diff --git a/services/web/frontend/js/ide/pdfng/directives/pdfJsLoader.js b/services/web/frontend/js/ide/pdfng/directives/pdfJsLoader.js
index 99cc6e40fc..dd5aabab63 100644
--- a/services/web/frontend/js/ide/pdfng/directives/pdfJsLoader.js
+++ b/services/web/frontend/js/ide/pdfng/directives/pdfJsLoader.js
@@ -18,8 +18,8 @@
  * to customise the loader's options. However the rest of the file is identical
  * to the one provided by PDF.js.
  */
-var pdfjs = require('pdfjs-dist/es5/build/pdf.js')
-var PdfjsWorker = require('pdfjs-dist/es5/build/pdf.worker.js')
+var pdfjs = require('pdfjs-dist/build/pdf.js')
+var PdfjsWorker = require('pdfjs-dist/build/pdf.worker.js')
 
 if (typeof window !== 'undefined' && 'Worker' in window) {
   pdfjs.GlobalWorkerOptions.workerPort = new PdfjsWorker()
diff --git a/services/web/package-lock.json b/services/web/package-lock.json
index 307d724edd..c810764d2b 100644
--- a/services/web/package-lock.json
+++ b/services/web/package-lock.json
@@ -5625,8 +5625,7 @@
     "big.js": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-3.2.0.tgz",
-      "integrity": "sha512-+hN/Zh2D08Mx65pZ/4g5bsmNiZUuChDiQfTUQ7qJr4/kuopCr88xZsAXv6mBoZEsUI4OuGHlX59qE94K2mMW8Q==",
-      "dev": true
+      "integrity": "sha512-+hN/Zh2D08Mx65pZ/4g5bsmNiZUuChDiQfTUQ7qJr4/kuopCr88xZsAXv6mBoZEsUI4OuGHlX59qE94K2mMW8Q=="
     },
     "bignumber.js": {
       "version": "7.2.1",
@@ -14937,7 +14936,6 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-1.1.0.tgz",
       "integrity": "sha512-gkD9aSEG9UGglyPcDJqY9YBTUtCLKaBK6ihD2VP1d1X60lTfFspNZNulGBBbUZLkPygy4LySYHyxBpq+VhjObQ==",
-      "dev": true,
       "requires": {
         "big.js": "^3.1.3",
         "emojis-list": "^2.0.0",
@@ -14947,8 +14945,7 @@
         "json5": {
           "version": "0.5.1",
           "resolved": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
-          "integrity": "sha512-4xrs1aW+6N5DalkqSVA8fxh458CXvR99WU8WLKmq4v8eWAL86Xo3BVqyd3SkA9wEVjCMqyvvRRkshAdOnBp5rw==",
-          "dev": true
+          "integrity": "sha512-4xrs1aW+6N5DalkqSVA8fxh458CXvR99WU8WLKmq4v8eWAL86Xo3BVqyd3SkA9wEVjCMqyvvRRkshAdOnBp5rw=="
         }
       }
     },
@@ -16503,6 +16500,11 @@
         "propagate": "^2.0.0"
       }
     },
+    "node-ensure": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/node-ensure/-/node-ensure-0.0.0.tgz",
+      "integrity": "sha512-DRI60hzo2oKN1ma0ckc6nQWlHU69RH6xN0sjQTjMpChPfTYvKZdcQFfdYK2RWbJcKyUizSIy/l8OTGxMAM1QDw=="
+    },
     "node-environment-flags": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/node-environment-flags/-/node-environment-flags-1.0.5.tgz",
@@ -18530,9 +18532,13 @@
       }
     },
     "pdfjs-dist": {
-      "version": "2.4.456",
-      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-2.4.456.tgz",
-      "integrity": "sha512-yckJEHq3F48hcp6wStEpbN9McOj328Ib09UrBlGAKxvN2k+qYPN5iq6TH6jD1C0pso7zTep+g/CKsYgdrQd5QA=="
+      "version": "2.2.228",
+      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-2.2.228.tgz",
+      "integrity": "sha512-W5LhYPMS2UKX0ELIa4u+CFCMoox5qQNQElt0bAK2mwz1V8jZL0rvLao+0tBujce84PK6PvWG36Nwr7agCCWFGQ==",
+      "requires": {
+        "node-ensure": "^0.0.0",
+        "worker-loader": "^2.0.0"
+      }
     },
     "pend": {
       "version": "1.2.0",
@@ -21699,41 +21705,36 @@
       "version": "0.4.7",
       "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-0.4.7.tgz",
       "integrity": "sha512-v/iwU6wvwGK8HbU9yi3/nhGzP0yGSuhQMzL6ySiec1FSrZZDkhm4noOSWzrNFo/jEc+SJY6jRTwuwbSXJPDUnQ==",
-      "dev": true,
       "requires": {
         "ajv": "^6.1.0",
         "ajv-keywords": "^3.1.0"
       },
       "dependencies": {
         "ajv": {
-          "version": "6.12.4",
-          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.4.tgz",
-          "integrity": "sha512-eienB2c9qVQs2KWexhkrdMLVDoIQCz5KSeLxwg9Lzk4DOfBtIK9PQwwufcsn1jjGuf9WZmqPMbGxOzfcuphJCQ==",
-          "dev": true,
+          "version": "6.10.2",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+          "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
           "requires": {
-            "fast-deep-equal": "^3.1.1",
+            "fast-deep-equal": "^2.0.1",
             "fast-json-stable-stringify": "^2.0.0",
             "json-schema-traverse": "^0.4.1",
             "uri-js": "^4.2.2"
           }
         },
         "ajv-keywords": {
-          "version": "3.5.2",
-          "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.5.2.tgz",
-          "integrity": "sha512-5p6WTN0DdTGVQk6VjcEju19IgaHudalcfabD7yhDGeA6bcQnmL+CpveLJq/3hvfwd1aof6L386Ougkx6RfyMIQ==",
-          "dev": true
+          "version": "3.4.1",
+          "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.4.1.tgz",
+          "integrity": "sha512-RO1ibKvd27e6FEShVFfPALuHI3WjSVNeK5FIsmme/LYRNxjKuNj+Dt7bucLa6NdSv3JcVTyMlm9kGR84z1XpaQ=="
         },
         "fast-deep-equal": {
-          "version": "3.1.3",
-          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
-          "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==",
-          "dev": true
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz",
+          "integrity": "sha512-bCK/2Z4zLidyB4ReuIsvALH6w31YfAQDmXMqMx6FyfHqvBxtjC0eRumeSu4Bs3XtXwpyIywtSTrVT99BxY1f9w=="
         },
         "json-schema-traverse": {
           "version": "0.4.1",
           "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
-          "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
-          "dev": true
+          "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg=="
         }
       }
     },
@@ -26636,7 +26637,6 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/worker-loader/-/worker-loader-2.0.0.tgz",
       "integrity": "sha512-tnvNp4K3KQOpfRnD20m8xltE3eWh89Ye+5oj7wXEEHKac1P4oZ6p9oTj8/8ExqoSBnk9nu5Pr4nKfQ1hn2APJw==",
-      "dev": true,
       "requires": {
         "loader-utils": "^1.0.0",
         "schema-utils": "^0.4.0"
diff --git a/services/web/package.json b/services/web/package.json
index 93645e400c..e8eb0a3267 100644
--- a/services/web/package.json
+++ b/services/web/package.json
@@ -115,7 +115,7 @@
     "passport-orcid": "0.0.4",
     "passport-saml": "^1.3.3",
     "passport-twitter": "^1.0.4",
-    "pdfjs-dist": "^2.4.456",
+    "pdfjs-dist": "^2.2.228",
     "prop-types": "^15.7.2",
     "pug": "^2.0.4",
     "qrcode": "^1.4.4",
@@ -215,7 +215,6 @@
     "webpack-cli": "^3.3.11",
     "webpack-dev-server": "^3.11.0",
     "webpack-manifest-plugin": "^2.2.0",
-    "webpack-merge": "^4.2.2",
-    "worker-loader": "^2.0.0"
+    "webpack-merge": "^4.2.2"
   }
 }