diff --git a/package-lock.json b/package-lock.json
index 79c98f81f0..c8829f5bb5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -942,9 +942,9 @@
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-      "resolved": "https://registry.npmjs.org/@webcomponents/webcomponentsjs/-/webcomponentsjs-2.0.0-beta.2.tgz",
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+      "resolved": "https://registry.npmjs.org/@webcomponents/webcomponentsjs/-/webcomponentsjs-2.0.0-beta.3.tgz",
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@@ -6097,21 +6097,6 @@
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-          "version": "2.6.9",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-          "requires": {
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-        "safe-buffer": {
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-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.1.tgz",
-          "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg=="
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@@ -26711,6 +26696,18 @@
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       "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0="
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+    "sinon": {
+      "version": "1.17.7",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-1.17.7.tgz",
+      "integrity": "sha1-RUKk9JugxFwF6y6d2dID4rjv4L8=",
+      "dev": true,
+      "requires": {
+        "formatio": "1.1.1",
+        "lolex": "1.3.2",
+        "samsam": "1.1.2",
+        "util": "0.10.3"
+      }
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       "resolved": "https://registry.npmjs.org/sinon-chai/-/sinon-chai-2.14.0.tgz",
@@ -28129,9 +28126,9 @@
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-      "resolved": "https://registry.npmjs.org/wct-browser-legacy/-/wct-browser-legacy-0.0.1-pre.11.tgz",
-      "integrity": "sha512-BZ8DUAAtFAX5l/SRQhB3Gtcimazr4fHgIt3Zdi+++cEvz7TjYBDp67uVakmUXIdEg0Wpnt2n19PGxA8O0OwaUQ==",
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wct-browser-legacy/-/wct-browser-legacy-1.0.0.tgz",
+      "integrity": "sha512-eWbVuY0OdLOPZMXAQMEjhbs1xn7WR6IgKfueMWE8CKdTAoXAfquQ+7rQRuXVSBN2l21YG8MP+U36XqLaTvkRHg==",
       "dev": true,
       "requires": {
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@@ -28150,12 +28147,9 @@
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-          "resolved": "https://registry.npmjs.org/formatio/-/formatio-1.2.0.tgz",
-          "integrity": "sha1-87IWfZBoxGmKjVH092CjmlTYGOs=",
-          "dev": true,
-          "requires": {
-            "samsam": "1.3.0"
-          }
+          "resolved": "https://registry.npmjs.org/@webcomponents/webcomponentsjs/-/webcomponentsjs-1.2.0.tgz",
+          "integrity": "sha512-P9JWydfpBR+CK12UwtBaoD/lYF3PR9XBArAWk5J9nfPaJwA3OUox4StZmyFSVDLsvpFq5HsEtxU/OdHAlAWPnw==",
+          "dev": true
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@@ -28168,37 +28162,6 @@
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-          "resolved": "https://registry.npmjs.org/samsam/-/samsam-1.3.0.tgz",
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-          "dev": true
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-          "version": "5.5.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-5.5.0.tgz",
-          "integrity": "sha512-4SJ3dm0WAwWy/NVeioZh5AntkdJoWKxHxcmyP622fOkgHa4z3R0TdBJICINyaSDE6uNwVc8gZr+ZinwZAH4xIA=="
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-        "sinon": {
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-          "resolved": "https://registry.npmjs.org/sinon/-/sinon-1.17.7.tgz",
-          "integrity": "sha1-RUKk9JugxFwF6y6d2dID4rjv4L8=",
-          "dev": true,
-          "requires": {
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-            "lolex": "1.3.2",
-            "samsam": "1.1.2",
-            "util": "0.10.3"
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-          "dependencies": {
-            "samsam": {
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-              "resolved": "https://registry.npmjs.org/samsam/-/samsam-1.1.2.tgz",
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-              "dev": true
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diff --git a/package.json b/package.json
index 20ad69ea81..885f7bbf81 100644
--- a/package.json
+++ b/package.json
@@ -10,9 +10,9 @@
   "devDependencies": {
     "@polymer/gen-closure-declarations": "^0.4.0",
     "@polymer/gen-typescript-declarations": "^1.2.0",
-    "@polymer/iron-component-page": "3.0.0-pre.12",
-    "@polymer/test-fixture": "3.0.0-pre.12",
-    "@webcomponents/webcomponentsjs": "^2.0.0-beta.2",
+    "@polymer/iron-component-page": "^3.0.0-pre.12",
+    "@polymer/test-fixture": "^3.0.0-pre.12",
+    "@webcomponents/webcomponentsjs": "^2.0.0-beta.3",
     "babel-eslint": "^7.2.3",
     "babel-preset-minify": "^0.2.0",
     "del": "^3.0.0",
@@ -34,7 +34,7 @@
     "polymer-cli": "^1.7.0",
     "run-sequence": "^2.2.0",
     "through2": "^2.0.0",
-    "wct-browser-legacy": "0.0.1-pre.11"
+    "wct-browser-legacy": "^1.0.0"
   },
   "scripts": {
     "build": "gulp",