diff --git a/package-lock.json b/package-lock.json
index 772055c..ed79ed2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,12 +25,27 @@
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-      "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ="
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@@ -684,7 +709,7 @@
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@@ -753,9 +778,9 @@
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@@ -1128,9 +1182,9 @@
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-      "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ="
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@@ -1172,7 +1226,8 @@
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@@ -1190,11 +1245,13 @@
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@@ -1207,15 +1264,18 @@
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@@ -1318,7 +1378,8 @@
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@@ -1328,6 +1389,7 @@
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@@ -1340,17 +1402,20 @@
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@@ -1439,7 +1505,8 @@
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@@ -1524,7 +1592,8 @@
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-      "integrity": "sha1-KzJxhOiZIQEXeyhWP7XnECrNDKk="
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+      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
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@@ -2569,7 +2642,7 @@
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@@ -2660,12 +2733,12 @@
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-      "integrity": "sha1-ZXFQT0e7mI7IGAJT+F3X4UlSvew=",
+      "version": "2.0.7",
+      "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
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-        "ipaddr.js": "1.5.2"
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-      "integrity": "sha1-9JvmtIeJTdxA3MlKMi9hEJLgDV4="
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@@ -2887,57 +2960,51 @@
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+      "resolved": "https://registry.npmjs.org/send/-/send-0.17.2.tgz",
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-        "depd": "~1.1.1",
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+        "encodeurl": "~1.0.2",
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         "fresh": "0.5.2",
-        "http-errors": "~1.6.2",
-        "mime": "1.4.1",
-        "ms": "2.0.0",
+        "http-errors": "1.8.1",
+        "mime": "1.6.0",
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-        "range-parser": "~1.2.0",
-        "statuses": "~1.3.1"
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-              "integrity": "sha1-V4O04cRZ8G+lyif5kfPQbnoxA1k="
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+          "requires": {
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+            "inherits": "2.0.4",
+            "setprototypeof": "1.2.0",
+            "statuses": ">= 1.5.0 < 2",
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+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
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-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+          "version": "2.1.3",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
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-          "integrity": "sha1-ZlZ+NwQ+608E2RvWWMDL77VbjgQ="
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-          "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.3.1.tgz",
-          "integrity": "sha1-+vUbnrdKrvOzrPStX2Gr8ky3uT4="
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
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@@ -3003,14 +3070,21 @@
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-      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.13.1.tgz",
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+      "version": "1.14.2",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.14.2.tgz",
+      "integrity": "sha512-+TMNA9AFxUEGuC0z2mevogSnn9MXKb4fa7ngeRMJaaGv8vTwnIEkKi+QGvPt33HSnf8pRS+WGM0EbMtCJLKMBQ==",
       "requires": {
-        "encodeurl": "~1.0.1",
+        "encodeurl": "~1.0.2",
         "escape-html": "~1.0.3",
-        "parseurl": "~1.3.2",
-        "send": "0.16.1"
+        "parseurl": "~1.3.3",
+        "send": "0.17.2"
+      },
+      "dependencies": {
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+          "version": "1.3.3",
+          "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
+          "integrity": "sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ=="
+        }
       }
     },
     "set-blocking": {
@@ -3365,6 +3439,11 @@
         "repeat-string": "^1.6.1"
       }
     },
+    "toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA=="
+    },
     "toposort-class": {
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       "resolved": "https://registry.npmjs.org/toposort-class/-/toposort-class-1.0.1.tgz",
@@ -3570,7 +3649,7 @@
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-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA=="
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@@ -3585,7 +3664,7 @@
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       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="
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@@ -3645,7 +3724,7 @@
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           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
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diff --git a/package.json b/package.json
index 87d16fb..674e067 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
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     "debug": "~2.6.0",
     "ejs": "~2.5.5",
-    "express": "^4.15.3",
+    "express": "^4.17.3",
     "morgan": "^1.9.1",
     "multer": "^1.3.0",
     "nodemon": "^1.18.9",