diff --git a/moodle/npm-shrinkwrap.json b/moodle/npm-shrinkwrap.json
index 94c49b7e..aa3e3ea4 100644
--- a/moodle/npm-shrinkwrap.json
+++ b/moodle/npm-shrinkwrap.json
@@ -1089,10 +1089,21 @@
       "dev": true
     },
     "async": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
-      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
-      "dev": true
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.14"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.21",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+          "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
+          "dev": true
+        }
+      }
     },
     "async-foreach": {
       "version": "0.1.3",
@@ -3370,6 +3381,12 @@
         "tiny-lr": "^0.2.1"
       },
       "dependencies": {
+        "async": {
+          "version": "1.5.2",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
+          "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+          "dev": true
+        },
         "lodash": {
           "version": "3.10.1",
           "resolved": "https://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz",
@@ -3461,6 +3478,12 @@
         "which": "~1.2.1"
       },
       "dependencies": {
+        "async": {
+          "version": "1.5.2",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
+          "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+          "dev": true
+        },
         "lodash": {
           "version": "4.3.0",
           "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.3.0.tgz",
diff --git a/moodle/package.json b/moodle/package.json
index f5f0cd45..17b7587d 100644
--- a/moodle/package.json
+++ b/moodle/package.json
@@ -10,7 +10,7 @@
     "@babel/plugin-syntax-import-meta": "7.2.0",
     "@babel/preset-env": "7.4.5",
     "ajv": "6.9.1",
-    "async": "1.5.2",
+    "async": "2.6.4",
     "babel-eslint": "10.0.1",
     "babel-plugin-system-import-transformer": "^4.0.0",
     "babel-plugin-transform-es2015-modules-amd-lazy": "2.0.1",