diff --git a/package-lock.json b/package-lock.json
index 0f02738..b535fe7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -195,11 +195,24 @@
         "any-observable": "^0.3.0"
       }
     },
+    "@types/node": {
+      "version": "12.7.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.2.tgz",
+      "integrity": "sha512-dyYO+f6ihZEtNPDcWNR1fkoTDf3zAK3lAABDze3mz6POyIercH0lEUawUFXlG8xaQZmm1yEBON/4TsYv/laDYg=="
+    },
     "@types/q": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/@types/q/-/q-1.5.2.tgz",
       "integrity": "sha512-ce5d3q03Ex0sy4R14722Rmt6MT07Ua+k4FwDfdcToYJcMKNtRVQvJ6JCAPdAmAnbRb6CsX6aYb9m96NGod9uTw=="
     },
+    "@types/sax": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@types/sax/-/sax-1.2.0.tgz",
+      "integrity": "sha512-D8ef/GGUjiHuUOiXV6tkJw6Zq2Sm8vcBScJSvj+monDI5YncJ6M3oNIXR7EtmWPVqJw0jsZF2ARN/X5gvGmQSA==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@webassemblyjs/ast": {
       "version": "1.8.5",
       "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.8.5.tgz",
@@ -480,6 +493,11 @@
         "readable-stream": "^2.0.6"
       }
     },
+    "arg": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/arg/-/arg-4.1.1.tgz",
+      "integrity": "sha512-SlmP3fEA88MBv0PypnXZ8ZfJhwmDeIE3SP71j37AiXQBXYosPV0x6uISAaHYSlSVhmHOVkomen0tbGk6Anlebw=="
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -4946,6 +4964,7 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-2.0.0.tgz",
       "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
+      "optional": true,
       "requires": {
         "is-glob": "^2.0.0"
       }
@@ -5763,7 +5782,8 @@
     "is-extglob": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-1.0.0.tgz",
-      "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA="
+      "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA=",
+      "optional": true
     },
     "is-finite": {
       "version": "1.0.2",
@@ -5782,6 +5802,7 @@
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-2.0.1.tgz",
       "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
+      "optional": true,
       "requires": {
         "is-extglob": "^1.0.0"
       }
@@ -7551,6 +7572,7 @@
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
       "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
+      "optional": true,
       "requires": {
         "remove-trailing-separator": "^1.0.1"
       }
@@ -11693,12 +11715,15 @@
       }
     },
     "sitemap": {
-      "version": "1.13.0",
-      "resolved": "https://registry.npmjs.org/sitemap/-/sitemap-1.13.0.tgz",
-      "integrity": "sha1-Vpy+IYAgKSamKiZs094Jyc60P4M=",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/sitemap/-/sitemap-4.1.1.tgz",
+      "integrity": "sha512-+8yd66IxyIFEMFkFpVoPuoPwBvdiL7Ap/HS5YD7igqO4phkyTPFIprCAE9NMHehAY5ZGN3MkAze4lDrOAX3sVQ==",
       "requires": {
-        "underscore": "^1.7.0",
-        "url-join": "^1.1.0"
+        "@types/node": "^12.0.2",
+        "@types/sax": "^1.2.0",
+        "arg": "^4.1.1",
+        "sax": "^1.2.4",
+        "xmlbuilder": "^13.0.0"
       }
     },
     "slash": {
@@ -12684,11 +12709,6 @@
         }
       }
     },
-    "underscore": {
-      "version": "1.9.1",
-      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.9.1.tgz",
-      "integrity": "sha512-5/4etnCkd9c8gwgowi5/om/mYO5ajCaOgdzj/oW+0eQV9WxKBDZw5+ycmKmeaTXjInS/W0BzpGLo2xR2aBwZdg=="
-    },
     "unicode": {
       "version": "11.0.1",
       "resolved": "https://registry.npmjs.org/unicode/-/unicode-11.0.1.tgz",
@@ -12847,11 +12867,6 @@
         }
       }
     },
-    "url-join": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/url-join/-/url-join-1.1.0.tgz",
-      "integrity": "sha1-dBxsL0WWxIMNZxhGCSDQySIC3Hg="
-    },
     "use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
@@ -13932,6 +13947,11 @@
       "resolved": "https://registry.npmjs.org/x-xss-protection/-/x-xss-protection-1.1.0.tgz",
       "integrity": "sha512-rx3GzJlgEeZ08MIcDsU2vY2B1QEriUKJTSiNHHUIem6eg9pzVOr2TL3Y4Pd6TMAM5D5azGjcxqI62piITBDHVg=="
     },
+    "xmlbuilder": {
+      "version": "13.0.2",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-13.0.2.tgz",
+      "integrity": "sha512-Eux0i2QdDYKbdbA6AM6xE4m6ZTZr4G4xF9kahI2ukSEMCzwce2eX9WlTI5J3s+NU7hpasFsr8hWIONae7LluAQ=="
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
diff --git a/package.json b/package.json
index 5fb9f80..73d0d05 100644
--- a/package.json
+++ b/package.json
@@ -102,7 +102,7 @@
     "redux-thunk": "^2.3.0",
     "response-time": "^2.3.2",
     "sass-loader": "^7.1.0",
-    "sitemap": "^1.13.0",
+    "sitemap": "^4.1.1",
     "slug": "^0.9.1",
     "stripe": "^6.7.0",
     "theme": "file:theme",