diff --git a/package-lock.json b/package-lock.json
index 1dfcad9..a525463 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4355,7 +4355,8 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -4720,7 +4721,8 @@
         },
         "safe-buffer": {
           "version": "5.1.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -4768,6 +4770,7 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -4806,11 +4809,13 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         }
       }
     },
@@ -4941,6 +4946,7 @@
       "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"
       }
@@ -5758,7 +5764,8 @@
     "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",
@@ -5777,6 +5784,7 @@
       "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"
       }
@@ -7546,6 +7554,7 @@
       "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"
       }
@@ -11688,12 +11697,13 @@
       }
     },
     "sitemap": {
-      "version": "1.13.0",
-      "resolved": "https://registry.npmjs.org/sitemap/-/sitemap-1.13.0.tgz",
-      "integrity": "sha1-Vpy+IYAgKSamKiZs094Jyc60P4M=",
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/sitemap/-/sitemap-2.2.0.tgz",
+      "integrity": "sha512-9Zoi3UBhSIt5jWENDRUbzsqLMJ+Fha3P2aQ2PRghmh0FOivtHsC4FAJdkAEKHvATajd74BWp/57Yh7kz/UA53Q==",
       "requires": {
-        "underscore": "^1.7.0",
-        "url-join": "^1.1.0"
+        "lodash": "^4.17.10",
+        "url-join": "^4.0.0",
+        "xmlbuilder": "^10.0.0"
       }
     },
     "slash": {
@@ -12679,11 +12689,6 @@
         }
       }
     },
-    "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",
@@ -12843,9 +12848,9 @@
       }
     },
     "url-join": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/url-join/-/url-join-1.1.0.tgz",
-      "integrity": "sha1-dBxsL0WWxIMNZxhGCSDQySIC3Hg="
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/url-join/-/url-join-4.0.0.tgz",
+      "integrity": "sha1-TTNA6AfTdzvamZH4MFrNzCpmXSo="
     },
     "use": {
       "version": "3.1.1",
@@ -13927,6 +13932,11 @@
       "resolved": "https://registry.npmjs.org/x-xss-protection/-/x-xss-protection-1.1.0.tgz",
       "integrity": "sha512-rx3GzJlgEeZ08MIcDsU2vY2B1QEriUKJTSiNHHUIem6eg9pzVOr2TL3Y4Pd6TMAM5D5azGjcxqI62piITBDHVg=="
     },
+    "xmlbuilder": {
+      "version": "10.1.1",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-10.1.1.tgz",
+      "integrity": "sha512-OyzrcFLL/nb6fMGHbiRDuPup9ljBycsdCypwuyg5AAHvyWzGfChJpCXMG88AGTIMFhGZ9RccFN1e6lhg3hkwKg=="
+    },
     "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 7c2cdb7..d76b799 100644
--- a/package.json
+++ b/package.json
@@ -104,7 +104,7 @@
     "redux-thunk": "^2.3.0",
     "response-time": "^2.3.2",
     "sass-loader": "^7.1.0",
-    "sitemap": "^1.13.0",
+    "sitemap": "^2.2.0",
     "slug": "^0.9.1",
     "stripe": "^6.7.0",
     "theme": "file:theme",