diff --git a/package-lock.json b/package-lock.json
index 097b23a..7fb93b2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,15 +11,15 @@
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-      "integrity": "sha1-X6rZwsB/YN12dw9xzwJbYqY8/U4=",
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+      "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.6.tgz",
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-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-2.7.0.tgz",
-      "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc=",
+      "version": "8.7.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.7.1.tgz",
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@@ -40,14 +40,29 @@
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-      "integrity": "sha1-VbtemGkVB7dFedBRNBMhfDgMVM8=",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-6.0.0.tgz",
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       "dev": true,
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-        "acorn": "2.7.0"
+        "acorn": "^7.1.1",
+        "acorn-walk": "^7.1.1"
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+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
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+          "dev": true
+        }
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+    "acorn-walk": {
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+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz",
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+    },
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@@ -185,7 +200,7 @@
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-      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
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@@ -1040,15 +1055,6 @@
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@@ -1076,6 +1082,12 @@
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+      "resolved": "https://registry.npmjs.org/browser-process-hrtime/-/browser-process-hrtime-1.0.0.tgz",
+      "integrity": "sha512-9o5UecI3GhkpM6DrXr69PblIuWxPKk9Y0jHBRhdocZ2y7YECBFCsHm79Pr3OyR2AvjhDkabFJaDJMYRazHgsow==",
+      "dev": true
+    },
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@@ -1184,7 +1196,7 @@
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-      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
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@@ -1560,26 +1572,6 @@
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@@ -1599,18 +1591,26 @@
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-      "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.2.tgz",
-      "integrity": "sha1-uANhcMefB6kP8vFuIihAJ6JDhIs=",
+      "version": "0.4.4",
+      "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.4.4.tgz",
+      "integrity": "sha512-p3pvU7r1MyyqbTk+WbNJIgJjG2VmTIaB10rI93LzVPrmDJKkzKYMtxxyAvQXR/NS6otuzveI7+7BBq3SjBS2mw==",
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-      "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-0.2.37.tgz",
-      "integrity": "sha1-VBCXI0yyUTyDzu06zdwn/yeYfVQ=",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-2.3.0.tgz",
+      "integrity": "sha512-AZL67abkUzIuvcHqk7c09cezpGNcxUxU4Ioi/05xHk4DQeTkWmGYftIE6ctU6AEt+Gn4n1lDStOtj7FKycP71A==",
       "dev": true,
       "requires": {
-        "cssom": "0.3.2"
+        "cssom": "~0.3.6"
+      },
+      "dependencies": {
+        "cssom": {
+          "version": "0.3.8",
+          "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
+          "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg==",
+          "dev": true
+        }
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@@ -1631,6 +1631,17 @@
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+      "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-2.0.0.tgz",
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+      "dev": true,
+      "requires": {
+        "abab": "^2.0.3",
+        "whatwg-mimetype": "^2.3.0",
+        "whatwg-url": "^8.0.0"
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@@ -1652,10 +1663,16 @@
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+      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.3.1.tgz",
+      "integrity": "sha512-V0pfhfr8suzyPGOx3nmq4aHqabehUZn6Ch9kyFpV79TGDTWFmHqUqXdabR7QHqxzrYolF4+tVmJhUG4OURg5dQ==",
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-      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.4.tgz",
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@@ -1706,6 +1723,23 @@
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       "dev": true
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+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/domexception/-/domexception-2.0.1.tgz",
+      "integrity": "sha512-yxJ2mFy/sibVQlu5qHjOkf9J3K6zgmCxgJ94u2EdvDOV09H+32LtRswEcUsmUWN72pVLOEnTSRaIVVzVQgS0dg==",
+      "dev": true,
+      "requires": {
+        "webidl-conversions": "^5.0.0"
+      },
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+        "webidl-conversions": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-5.0.0.tgz",
+          "integrity": "sha512-VlZwKPCkYKxQgeSbH5EyngOmRp7Ww7I9rQLERETtf5ofd9pGeswWiOtogpEO850jziPRarreGxn5QIiTqpb2wA==",
+          "dev": true
+        }
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@@ -1844,16 +1878,31 @@
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+      "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-2.0.0.tgz",
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-        "estraverse": "4.2.0",
-        "esutils": "2.0.2",
-        "optionator": "0.8.2",
-        "source-map": "0.5.7"
+        "esprima": "^4.0.1",
+        "estraverse": "^5.2.0",
+        "esutils": "^2.0.2",
+        "optionator": "^0.8.1",
+        "source-map": "~0.6.1"
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+          "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.3.0.tgz",
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+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
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+          "dev": true,
+          "optional": true
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@@ -1869,9 +1918,9 @@
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-      "integrity": "sha1-/cpRzuYTOJXjyI1TXOSdv/YqRjM=",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
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@@ -2001,10 +2050,16 @@
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       "dev": true
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+    "fast-json-stable-stringify": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz",
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+    },
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@@ -2078,14 +2133,25 @@
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-      "integrity": "sha1-b7lPvXGIUwbXPRXMSX/kzE7NRL8=",
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.3.tgz",
+      "integrity": "sha512-1lLKB2Mu3aGP1Q/2eCOx0fNbRMe7XdwktwOruhfqqd0rIJWwN4Dh+E3hrPSlDCXnSR7UtZ1N38rVXm+6+MEhJQ==",
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-        "asynckit": "0.4.0",
-        "combined-stream": "1.0.5",
-        "mime-types": "2.1.17"
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.6",
+        "mime-types": "^2.1.12"
+      },
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+          "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
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+          "dev": true,
+          "requires": {
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+          }
+        }
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@@ -2130,7 +2196,8 @@
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@@ -2181,7 +2248,8 @@
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@@ -2196,6 +2264,7 @@
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@@ -2204,6 +2273,7 @@
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@@ -2212,6 +2282,7 @@
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@@ -2220,7 +2291,8 @@
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@@ -2237,12 +2309,14 @@
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@@ -2250,17 +2324,20 @@
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@@ -2306,7 +2383,8 @@
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@@ -2332,7 +2410,8 @@
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@@ -2354,12 +2433,14 @@
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           "version": "1.0.0",
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-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -2415,6 +2496,7 @@
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@@ -2427,7 +2509,8 @@
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@@ -2466,7 +2549,8 @@
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@@ -2483,6 +2567,7 @@
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@@ -2491,7 +2576,8 @@
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+      "version": "8.7.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-8.7.0.tgz",
+      "integrity": "sha512-gAojqb/m9Q8a5IV96E3fHJM70AzCkgt4uXYX2O7EmuyOnLrViCQlsEBmF9UQIu3/aeAIp2U17rtbpZWNntQqdg==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.7.0",
+        "tr46": "^2.1.0",
+        "webidl-conversions": "^6.1.0"
       }
     },
     "which": {
@@ -6769,10 +7117,10 @@
       "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
       "dev": true
     },
-    "wordwrap": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
-      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
       "dev": true
     },
     "wrap-ansi": {
@@ -6804,10 +7152,22 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "ws": {
+      "version": "7.5.8",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.8.tgz",
+      "integrity": "sha512-ri1Id1WinAX5Jqn9HejiGb8crfRio0Qgu8+MtL36rlTA6RLsMdWt1Az/19A2Qij6uSHUMphEFaTKa4WG+UNHNw==",
+      "dev": true
+    },
     "xml-name-validator": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-2.0.1.tgz",
-      "integrity": "sha1-TYuPHszTQZqjYgYb7O9RXh5VljU=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
+    "xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
       "dev": true
     },
     "xtend": {
diff --git a/package.json b/package.json
index 9c19d25..de8d312 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "babel-loader": "^7.1.2",
     "babel-minify-webpack-plugin": "^0.2.0",
     "babel-preset-es2015": "^6.24.1",
-    "jsdom": "^7.0.0",
+    "jsdom": "^16.5.0",
     "parse5": "^3.0.2",
     "tap": "^10.3.0",
     "webcomponents.js": "github:webcomponents/webcomponentsjs#v0.7.24",