diff --git a/package-lock.json b/package-lock.json
index 9a7f4cf..e536fe9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -199,6 +199,23 @@
       "integrity": "sha1-ECyenpAF0+fjgpvwxPok7oYu6bk=",
       "dev": true
     },
+    "async": {
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.14"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.15",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
+          "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
+          "dev": true
+        }
+      }
+    },
     "async-each": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
@@ -4468,22 +4485,14 @@
       }
     },
     "sass-loader": {
-      "version": "3.2.3",
-      "resolved": "https://registry.npmjs.org/sass-loader/-/sass-loader-3.2.3.tgz",
-      "integrity": "sha1-dC6B/YFwqHcal54YYiUBZ0qI41U=",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/sass-loader/-/sass-loader-4.1.1.tgz",
+      "integrity": "sha1-ee+UaM8L9kbClSnh8sumvW5Rx7w=",
       "dev": true,
       "requires": {
-        "async": "^1.4.0",
-        "loader-utils": "^0.2.5",
-        "object-assign": "^4.0.1"
-      },
-      "dependencies": {
-        "async": {
-          "version": "1.5.2",
-          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
-          "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
-          "dev": true
-        }
+        "async": "^2.0.1",
+        "loader-utils": "^0.2.15",
+        "object-assign": "^4.1.0"
       }
     },
     "sax": {
diff --git a/package.json b/package.json
index 828b4aa..2dc5ea9 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "mocha-loader": "^0.7.1",
     "node-sass": "^3.3.3",
     "raw-loader": "^0.5.1",
-    "sass-loader": "^3.1.1",
+    "sass-loader": "^4.1.1",
     "style-loader": "^0.12.4",
     "transfer-webpack-plugin": "^0.1.4",
     "webpack": "^1.12.2"