diff --git a/package-lock.json b/package-lock.json
index 2070c48..96808cd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -86,11 +86,11 @@
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
     },
     "async": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.1.tgz",
-      "integrity": "sha512-fNEiL2+AZt6AlAw/29Cr0UDe4sRAHCpEHh54WMz+Bb7QfNcFw4h3loofyJpLeQs4Yx7yuqu/2dLgM5hKOs6HlQ==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "requires": {
-        "lodash": "4.17.11"
+        "lodash": "^4.17.14"
       }
     },
     "asynckit": {
@@ -1031,9 +1031,9 @@
       "integrity": "sha1-odePw6UEdMuAhF07O24dpJpEbo4="
     },
     "lodash": {
-      "version": "4.17.11",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
-      "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg=="
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
     },
     "lodash._baseassign": {
       "version": "3.2.0",
diff --git a/package.json b/package.json
index 8e3e4e0..f0f54a3 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "test": "./node_modules/.bin/mocha tests --timeout 1500000"
   },
   "dependencies": {
-    "async": "^2.5.0",
+    "async": "^2.6.4",
     "body-parser": "~1.17.1",
     "cookie-parser": "~1.4.3",
     "debug": "~2.6.3",