diff --git a/package-lock.json b/package-lock.json
index 187d9ad..0291a53 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -35,6 +35,11 @@
         "type-is": "1.6.15"
       }
     },
+    "bowser": {
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+      "resolved": "https://registry.npmjs.org/bowser/-/bowser-2.6.1.tgz",
+      "integrity": "sha512-hySGUuLhi0KetfxPZpuJOsjM0kRvCiCgPBygBkzGzJNsq/nbJmaO8QJc6xlWfeFFnMvtd/LeKkhDJGVrmVobUA=="
+    },
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       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
@@ -73,12 +78,9 @@
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-      "resolved": "https://registry.npmjs.org/content-security-policy-builder/-/content-security-policy-builder-1.1.0.tgz",
-      "integrity": "sha1-2R8bB2I2wRmFDH3umSS/VeBXcrM=",
-      "requires": {
-        "dashify": "0.2.2"
-      }
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/content-security-policy-builder/-/content-security-policy-builder-2.1.0.tgz",
+      "integrity": "sha512-/MtLWhJVvJNkA9dVLAp6fg9LxD2gfI6R2Fi1hPmfjYXSahJJzcfvoeDOxSyp4NvxMuwWv3WMssE9o31DoULHrQ=="
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@@ -105,11 +107,6 @@
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       "integrity": "sha1-bYCcnNDPe7iVLYD8hPoT1H3bEwg="
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-    "dashify": {
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-      "resolved": "https://registry.npmjs.org/dashify/-/dashify-0.2.2.tgz",
-      "integrity": "sha1-agdBWgHJH69KMuONnfunH2HLIP4="
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@@ -134,14 +131,14 @@
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-      "resolved": "https://registry.npmjs.org/dns-prefetch-control/-/dns-prefetch-control-0.1.0.tgz",
-      "integrity": "sha1-YN20V3dOF48flBXwyrsOhbCzALI="
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/dns-prefetch-control/-/dns-prefetch-control-0.2.0.tgz",
+      "integrity": "sha512-hvSnros73+qyZXhHFjx2CMLwoj3Fe7eR9EJsFsqmcI1bB2OBWL/+0YzaEaKssCHnj/6crawNnUyw74Gm2EKe+Q=="
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-      "resolved": "https://registry.npmjs.org/dont-sniff-mimetype/-/dont-sniff-mimetype-1.0.0.tgz",
-      "integrity": "sha1-WTKJDcn04vGeXrAqIAJuXl78j1g="
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/dont-sniff-mimetype/-/dont-sniff-mimetype-1.1.0.tgz",
+      "integrity": "sha512-ZjI4zqTaxveH2/tTlzS1wFp+7ncxNZaIEWYg3lzZRHkKf5zPT/MnEG6WL0BhHMJUabkh8GeU5NL5j+rEUCb7Ug=="
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@@ -164,9 +161,9 @@
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     },
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-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/expect-ct/-/expect-ct-0.1.0.tgz",
-      "integrity": "sha1-UnNWeN4YUwiQ2Ne5XwrGNkCVgJQ="
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/expect-ct/-/expect-ct-0.2.0.tgz",
+      "integrity": "sha512-6SK3MG/Bbhm8MsgyJAylg+ucIOU71/FzyFalcfu5nY19dH8y/z0tBJU0wrNBXD4B27EoQtqPF/9wqH0iYAd04g=="
     },
     "express": {
       "version": "4.16.2",
@@ -205,6 +202,11 @@
         "vary": "1.1.2"
       }
     },
+    "feature-policy": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/feature-policy/-/feature-policy-0.3.0.tgz",
+      "integrity": "sha512-ZtijOTFN7TzCujt1fnNhfWPFPSHeZkesff9AXZj+UEjYBynWNUIYpC87Ve4wHzyexQsImicLu7WsC2LHq7/xrQ=="
+    },
     "finalhandler": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.0.tgz",
@@ -225,9 +227,9 @@
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     },
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-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/frameguard/-/frameguard-3.0.0.tgz",
-      "integrity": "sha1-e8rUae57lukdEs6zlZx4I1qScuk="
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/frameguard/-/frameguard-3.1.0.tgz",
+      "integrity": "sha512-TxgSKM+7LTA6sidjOiSZK9wxY0ffMPY3Wta//MqwmX0nZuEHc8QrkV8Fh3ZhMJeiH+Uyh/tcaarImRy8u77O7g=="
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@@ -240,40 +242,54 @@
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     },
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-      "version": "3.9.0",
-      "resolved": "https://registry.npmjs.org/helmet/-/helmet-3.9.0.tgz",
-      "integrity": "sha512-czCyS77TyanWlfVSoGlb9GBJV2Q2zJayKxU5uBw0N1TzDTs/qVNh1SL8Q688KU0i0Sb7lQ/oLtnaEqXzl2yWvA==",
+      "version": "3.21.1",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-3.21.1.tgz",
+      "integrity": "sha512-IC/54Lxvvad2YiUdgLmPlNFKLhNuG++waTF5KPYq/Feo3NNhqMFbcLAlbVkai+9q0+4uxjxGPJ9bNykG+3zZNg==",
       "requires": {
-        "dns-prefetch-control": "0.1.0",
-        "dont-sniff-mimetype": "1.0.0",
-        "expect-ct": "0.1.0",
-        "frameguard": "3.0.0",
-        "helmet-csp": "2.6.0",
-        "hide-powered-by": "1.0.0",
+        "depd": "2.0.0",
+        "dns-prefetch-control": "0.2.0",
+        "dont-sniff-mimetype": "1.1.0",
+        "expect-ct": "0.2.0",
+        "feature-policy": "0.3.0",
+        "frameguard": "3.1.0",
+        "helmet-crossdomain": "0.4.0",
+        "helmet-csp": "2.9.2",
+        "hide-powered-by": "1.1.0",
         "hpkp": "2.0.0",
-        "hsts": "2.1.0",
-        "ienoopen": "1.0.0",
-        "nocache": "2.0.0",
-        "referrer-policy": "1.1.0",
-        "x-xss-protection": "1.0.0"
+        "hsts": "2.2.0",
+        "ienoopen": "1.1.0",
+        "nocache": "2.1.0",
+        "referrer-policy": "1.2.0",
+        "x-xss-protection": "1.3.0"
+      },
+      "dependencies": {
+        "depd": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+          "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw=="
+        }
       }
     },
+    "helmet-crossdomain": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/helmet-crossdomain/-/helmet-crossdomain-0.4.0.tgz",
+      "integrity": "sha512-AB4DTykRw3HCOxovD1nPR16hllrVImeFp5VBV9/twj66lJ2nU75DP8FPL0/Jp4jj79JhTfG+pFI2MD02kWJ+fA=="
+    },
     "helmet-csp": {
-      "version": "2.6.0",
-      "resolved": "https://registry.npmjs.org/helmet-csp/-/helmet-csp-2.6.0.tgz",
-      "integrity": "sha512-n/oW9l6RtO4f9YvphsNzdvk1zITrSN7iRT8ojgrJu/N3mVdHl9zE4OjbiHWcR64JK32kbqx90/yshWGXcjUEhw==",
+      "version": "2.9.2",
+      "resolved": "https://registry.npmjs.org/helmet-csp/-/helmet-csp-2.9.2.tgz",
+      "integrity": "sha512-Lt5WqNfbNjEJ6ysD4UNpVktSyjEKfU9LVJ1LaFmPfYseg/xPealPfgHhtqdAdjPDopp5zbg/VWCyp4cluMIckw==",
       "requires": {
+        "bowser": "^2.6.1",
         "camelize": "1.0.0",
-        "content-security-policy-builder": "1.1.0",
-        "dasherize": "2.0.0",
-        "lodash.reduce": "4.6.0",
-        "platform": "1.3.4"
+        "content-security-policy-builder": "2.1.0",
+        "dasherize": "2.0.0"
       }
     },
     "hide-powered-by": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/hide-powered-by/-/hide-powered-by-1.0.0.tgz",
-      "integrity": "sha1-SoWtZYgfYoV/xwr3F0oRhNzM4ys="
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/hide-powered-by/-/hide-powered-by-1.1.0.tgz",
+      "integrity": "sha512-Io1zA2yOA1YJslkr+AJlWSf2yWFkKjvkcL9Ni1XSUqnGLr/qRQe2UI3Cn/J9MsJht7yEVCe0SscY1HgVMujbgg=="
     },
     "hpack.js": {
       "version": "2.1.6",
@@ -292,9 +308,19 @@
       "integrity": "sha1-EOFCJk52IVpdMMROxD3mTe5tFnI="
     },
     "hsts": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/hsts/-/hsts-2.1.0.tgz",
-      "integrity": "sha512-zXhh/DqgrTXJ7erTN6Fh5k/xjMhDGXCqdYN3wvxUvGUQvnxcFfUd8E+6vLg/nk3ss1TYMb+DhRl25fYABioTvA=="
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/hsts/-/hsts-2.2.0.tgz",
+      "integrity": "sha512-ToaTnQ2TbJkochoVcdXYm4HOCliNozlviNsg+X2XQLQvZNI/kCHR9rZxVYpJB3UPcHz80PgxRyWQ7PdU1r+VBQ==",
+      "requires": {
+        "depd": "2.0.0"
+      },
+      "dependencies": {
+        "depd": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+          "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw=="
+        }
+      }
     },
     "http-deceiver": {
       "version": "1.2.7",
@@ -325,9 +351,9 @@
       "integrity": "sha512-oTZqweIP51xaGPI4uPa56/Pri/480R+mo7SeU+YETByQNhDG55ycFyNLIgta9vXhILrxXDmF7ZGhqZIcuN0gJQ=="
     },
     "ienoopen": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/ienoopen/-/ienoopen-1.0.0.tgz",
-      "integrity": "sha1-NGpCj0dKrI9QzzeE6i0PFvYr2ms="
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/ienoopen/-/ienoopen-1.1.0.tgz",
+      "integrity": "sha512-MFs36e/ca6ohEKtinTJ5VvAJ6oDRAYFdYXweUnGY9L9vcoqFOU4n2ZhmJ0C4z/cwGZ3YIQRSB3XZ1+ghZkY5NQ=="
     },
     "inherits": {
       "version": "2.0.3",
@@ -344,11 +370,6 @@
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
       "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
     },
-    "lodash.reduce": {
-      "version": "4.6.0",
-      "resolved": "https://registry.npmjs.org/lodash.reduce/-/lodash.reduce-4.6.0.tgz",
-      "integrity": "sha1-8atrg5KZrUj3hKu/R2WW8DuRTTs="
-    },
     "media-typer": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
@@ -398,9 +419,9 @@
       "integrity": "sha1-KzJxhOiZIQEXeyhWP7XnECrNDKk="
     },
     "nocache": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/nocache/-/nocache-2.0.0.tgz",
-      "integrity": "sha1-ICtIAhoMTL3i34DeFaF0Q8i0OYA="
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/nocache/-/nocache-2.1.0.tgz",
+      "integrity": "sha512-0L9FvHG3nfnnmaEQPjT9xhfN4ISk0A8/2j4M37Np4mcDesJjHgEUfgPhdCyZuFI954tjokaIj/A3NdpFNdEh4Q=="
     },
     "obuf": {
       "version": "1.1.1",
@@ -430,11 +451,6 @@
       "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
       "integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w="
     },
-    "platform": {
-      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/platform/-/platform-1.3.4.tgz",
-      "integrity": "sha1-bw+xftqqSPIUQrOpdcBjEw8cPr0="
-    },
     "process-nextick-args": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
@@ -485,9 +501,9 @@
       }
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     "referrer-policy": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/referrer-policy/-/referrer-policy-1.1.0.tgz",
-      "integrity": "sha1-NXdOtzW/UPtsB46DM0tHI1AgfXk="
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/referrer-policy/-/referrer-policy-1.2.0.tgz",
+      "integrity": "sha512-LgQJIuS6nAy1Jd88DCQRemyE3mS+ispwlqMk3b0yjZ257fI1v9c+/p6SD5gP5FGyXUIgrNOAfmyioHwZtYv2VA=="
     },
     "safe-buffer": {
       "version": "5.1.1",
@@ -613,9 +629,9 @@
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     "x-xss-protection": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/x-xss-protection/-/x-xss-protection-1.0.0.tgz",
-      "integrity": "sha1-iYr7k4abJGYc+cUvnujbjtB2Tdk="
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/x-xss-protection/-/x-xss-protection-1.3.0.tgz",
+      "integrity": "sha512-kpyBI9TlVipZO4diReZMAHWtS0MMa/7Kgx8hwG/EuZLiA6sg4Ah/4TRdASHhRRN3boobzcYgFRUFSgHRge6Qhg=="
     }
   }
 }
diff --git a/package.json b/package.json
index eb6572f..74f08e8 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   "dependencies": {
     "compression": "^1.7.1",
     "express": "^4.16.2",
-    "helmet": "^3.9.0",
+    "helmet": "^3.21.1",
     "spdy": "^3.4.7"
   }
 }