diff --git a/package-lock.json b/package-lock.json
index 131346c7d0..0a32738d36 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3604,9 +3604,9 @@
       }
     },
     "google-closure-compiler": {
-      "version": "20170626.0.0",
-      "resolved": "https://registry.npmjs.org/google-closure-compiler/-/google-closure-compiler-20170626.0.0.tgz",
-      "integrity": "sha1-DSqXXTReGqE7N+VYMlCdWbqKh+A=",
+      "version": "20170806.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-compiler/-/google-closure-compiler-20170806.0.0.tgz",
+      "integrity": "sha1-GwTZgFqLblxvl/2b4Ktx4aeIjuE=",
       "dev": true,
       "requires": {
         "chalk": "1.1.3",
diff --git a/package.json b/package.json
index 9d1c72d1de..f71d5f7a94 100644
--- a/package.json
+++ b/package.json
@@ -9,8 +9,8 @@
   },
   "devDependencies": {
     "@polymer/gen-closure-declarations": "^0.2.0",
-    "@webcomponents/shadycss": "^1.0.0",
-    "@webcomponents/webcomponentsjs": "^1.0.2",
+    "@webcomponents/shadycss": "^1.0.4",
+    "@webcomponents/webcomponentsjs": "^1.0.7",
     "babel-preset-babili": "^0.1.4",
     "del": "^3.0.0",
     "dom5": "^2.3.0",
@@ -28,7 +28,7 @@
     "polymer-build": "^2.0.0",
     "run-sequence": "^2.1.0",
     "through2": "^2.0.0",
-    "web-component-tester": "^6.0.0"
+    "web-component-tester": "^6.0.1"
   },
   "scripts": {
     "build": "gulp",