diff --git a/package-lock.json b/package-lock.json
index e759169..05f7a65 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -290,12 +290,20 @@
       "dev": true
     },
     "async": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.5.0.tgz",
-      "integrity": "sha512-e+lJAJeNWuPCNyxZKOBdaJGyLGHugXVQtrAwtuAe2vhxTYxFTKE73p8JuTmdH0qdQZtDvI4dhJwjZc5zsfIsYw==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "dev": true,
       "requires": {
-        "lodash": "^4.14.0"
+        "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-each": {
diff --git a/package.json b/package.json
index e49dfd6..78051b3 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "url": "https://github.com/fmidev/metolib.git"
   },
   "devDependencies": {
-    "async": "~2.5",
+    "async": "~2.6",
     "babel-core": "^6.26.0",
     "babel-loader": "^7.1.2",
     "babel-preset-es2015": "^6.24.1",