diff --git a/package.json b/package.json
index 1ecd815..3bb1f47 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
     "build": "NODE_ENV=production gulp build:prod && workbox generateSW"
   },
   "devDependencies": {
-    "async": "^2.6.1",
+    "async": "^2.6.4",
     "babel-core": "^6.26.3",
     "babel-loader": "^7.1.5",
     "babel-preset-env": "^1.7.0",
diff --git a/yarn.lock b/yarn.lock
index 080f8c0..1926743 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -490,11 +490,11 @@ async@^1.5.0:
   version "1.5.2"
   resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
 
-async@^2.6.1:
-  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/async/-/async-2.6.1.tgz#b245a23ca71930044ec53fa46aa00a3e87c6a610"
+async@^2.6.4:
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/async/-/async-2.6.4.tgz#706b7ff6084664cd7eae713f6f965433b5504221"
   dependencies:
-    lodash "^4.17.10"
+    lodash "^4.17.14"
 
 async@~1.0.0:
   version "1.0.0"
@@ -5394,7 +5394,7 @@ lodash@^3.10.1, lodash@^3.2.0:
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
 
-lodash@^4.0.0, lodash@^4.12.0, lodash@^4.13.1, lodash@^4.17.10, lodash@^4.17.15, lodash@^4.17.21, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.17.5, lodash@^4.3.0, lodash@~4.17.10:
+lodash@^4.0.0, lodash@^4.12.0, lodash@^4.13.1, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.21, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.17.5, lodash@^4.3.0, lodash@~4.17.10:
   version "4.17.21"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"