diff --git a/package-lock.json b/package-lock.json
index 5d3ccaedd..b33f48da0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,7 +24,7 @@
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     "express": {
       "version": "4.17.3",
       "resolved": "https://registry.npmjs.org/express/-/express-4.17.3.tgz",
@@ -32690,11 +32462,6 @@
         "pend": "~1.2.0"
       }
     },
-    "feature-policy": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/feature-policy/-/feature-policy-0.3.0.tgz",
-      "integrity": "sha512-ZtijOTFN7TzCujt1fnNhfWPFPSHeZkesff9AXZj+UEjYBynWNUIYpC87Ve4wHzyexQsImicLu7WsC2LHq7/xrQ=="
-    },
     "figgy-pudding": {
       "version": "3.5.1",
       "resolved": "https://registry.npmjs.org/figgy-pudding/-/figgy-pudding-3.5.1.tgz",
@@ -32957,11 +32724,6 @@
         "map-cache": "^0.2.2"
       }
     },
-    "frameguard": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/frameguard/-/frameguard-3.1.0.tgz",
-      "integrity": "sha512-TxgSKM+7LTA6sidjOiSZK9wxY0ffMPY3Wta//MqwmX0nZuEHc8QrkV8Fh3ZhMJeiH+Uyh/tcaarImRy8u77O7g=="
-    },
     "fresh": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
@@ -34138,49 +33900,9 @@
       "dev": true
     },
     "helmet": {
-      "version": "3.21.2",
-      "resolved": "https://registry.npmjs.org/helmet/-/helmet-3.21.2.tgz",
-      "integrity": "sha512-okUo+MeWgg00cKB8Csblu8EXgcIoDyb5ZS/3u0W4spCimeVuCUvVZ6Vj3O2VJ1Sxpyb8jCDvzu0L1KKT11pkIg==",
-      "requires": {
-        "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": "2.9.4",
-        "hide-powered-by": "1.1.0",
-        "hpkp": "2.0.0",
-        "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": "2.9.4",
-      "resolved": "https://registry.npmjs.org/helmet-csp/-/helmet-csp-2.9.4.tgz",
-      "integrity": "sha512-qUgGx8+yk7Xl8XFEGI4MFu1oNmulxhQVTlV8HP8tV3tpfslCs30OZz/9uQqsWPvDISiu/NwrrCowsZBhFADYqg==",
-      "requires": {
-        "bowser": "^2.7.0",
-        "camelize": "1.0.0",
-        "content-security-policy-builder": "2.1.0",
-        "dasherize": "2.0.0"
-      }
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-6.0.0.tgz",
+      "integrity": "sha512-FO9RpR1wNJepH/GbLPQVtkE2eESglXL641p7SdyoT4LngHFJcZheHMoyUcjCZF4qpuMMO1u5q6RK0l9Ux8JBcg=="
     },
     "hex-color-regex": {
       "version": "1.1.0",
@@ -34188,11 +33910,6 @@
       "integrity": "sha512-l9sfDFsuqtOqKDsQdqrMRk0U85RZc0RtOR9yPI7mRVOa4FsR/BVnZ0shmQRM96Ji99kYZP/7hn1cedc1+ApsTQ==",
       "dev": true
     },
-    "hide-powered-by": {
-      "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=="
-    },
     "highcharts": {
       "version": "9.3.3",
       "resolved": "https://registry.npmjs.org/highcharts/-/highcharts-9.3.3.tgz",
@@ -34230,11 +33947,6 @@
       "integrity": "sha512-kssjab8CvdXfcXMXVcvsXum4Hwdq9XGtRD3TteMEvEbq0LXyiNQr6AprqKqfeaDXze7SxWvRxdpwE6ku7ikLkg==",
       "dev": true
     },
-    "hpkp": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/hpkp/-/hpkp-2.0.0.tgz",
-      "integrity": "sha1-EOFCJk52IVpdMMROxD3mTe5tFnI="
-    },
     "hsl-regex": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/hsl-regex/-/hsl-regex-1.0.0.tgz",
@@ -34247,21 +33959,6 @@
       "integrity": "sha512-7Wn5GMLuHBjZCb2bTmnDOycho0p/7UVaAeqXZGbHrBCl6Yd/xDhQJAXe6Ga9AXJH2I5zY1dEdYw2u1UptnSBJA==",
       "dev": true
     },
-    "hsts": {
-      "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=="
-        }
-      }
-    },
     "html-entities": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/html-entities/-/html-entities-1.2.1.tgz",
@@ -34409,11 +34106,6 @@
       "integrity": "sha512-4vf7I2LYV/HaWerSo3XmlMkp5eZ83i+/CDluXi/IGTs/O1sejBNhTtnxzmRZfvOUqj7lZjqHkeTvpgSFDlWZTg==",
       "dev": true
     },
-    "ienoopen": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/ienoopen/-/ienoopen-1.1.0.tgz",
-      "integrity": "sha512-MFs36e/ca6ohEKtinTJ5VvAJ6oDRAYFdYXweUnGY9L9vcoqFOU4n2ZhmJ0C4z/cwGZ3YIQRSB3XZ1+ghZkY5NQ=="
-    },
     "iferr": {
       "version": "0.1.5",
       "resolved": "https://registry.npmjs.org/iferr/-/iferr-0.1.5.tgz",
@@ -36961,11 +36653,6 @@
         }
       }
     },
-    "nocache": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/nocache/-/nocache-2.1.0.tgz",
-      "integrity": "sha512-0L9FvHG3nfnnmaEQPjT9xhfN4ISk0A8/2j4M37Np4mcDesJjHgEUfgPhdCyZuFI954tjokaIj/A3NdpFNdEh4Q=="
-    },
     "nock": {
       "version": "11.0.0",
       "resolved": "https://registry.npmjs.org/nock/-/nock-11.0.0.tgz",
@@ -40031,11 +39718,6 @@
         "strip-indent": "^3.0.0"
       }
     },
-    "referrer-policy": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/referrer-policy/-/referrer-policy-1.2.0.tgz",
-      "integrity": "sha512-LgQJIuS6nAy1Jd88DCQRemyE3mS+ispwlqMk3b0yjZ257fI1v9c+/p6SD5gP5FGyXUIgrNOAfmyioHwZtYv2VA=="
-    },
     "reflect.ownkeys": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/reflect.ownkeys/-/reflect.ownkeys-0.2.0.tgz",
@@ -43503,11 +43185,6 @@
         "mkdirp": "^0.5.1"
       }
     },
-    "x-xss-protection": {
-      "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=="
-    },
     "xml-name-validator": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-2.0.1.tgz",
diff --git a/package.json b/package.json
index 574fdbfa7..44158a633 100644
--- a/package.json
+++ b/package.json
@@ -82,7 +82,7 @@
     "express": "4.17.3",
     "file-saver": "1.3.3",
     "fs-promise": "2.0.3",
-    "helmet": "3.21.2",
+    "helmet": "6.0.0",
     "highlight.js": "11.4.0",
     "immutable": "4.0.0-rc.9",
     "immutable-class": "0.9.8",
@@ -126,7 +126,6 @@
     "@types/file-saver": "1.3.0",
     "@types/fs-promise": "1.0.3",
     "@types/geojson": "7946.0.0",
-    "@types/helmet": "0.0.37",
     "@types/js-yaml": "3.10.1",
     "@types/jsdom": "2.0.28",
     "@types/lz-string": "1.3.32",
diff --git a/src/server/app.ts b/src/server/app.ts
index fabed025c..5ee4a8b11 100644
--- a/src/server/app.ts
+++ b/src/server/app.ts
@@ -76,7 +76,7 @@ export default function createApp(serverSettings: ServerSettings, settingsManage
   if (serverSettings.strictTransportSecurity === "always") {
     app.use(hsts({
       maxAge: 10886400000,     // Must be at least 18 weeks to be approved by Google
-      includeSubdomains: true, // Must be enabled to be approved by Google
+      includeSubDomains: true, // Must be enabled to be approved by Google
       preload: true
     }));
   }