diff --git a/WORKSPACE b/WORKSPACE
index 25a797c804..766b77cd6b 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -1152,8 +1152,8 @@ bower_archive(
 bower_archive(
     name = "web-component-tester",
     package = "polymer/web-component-tester",
-    sha1 = "62739cb633fccfddc5eeed98e9e3f69cd0388b5b",
-    version = "6.5.0",
+    sha1 = "d84f6a13bde5f8fd39ee208d43f33925410530d7",
+    version = "6.5.1",
 )
 
 # Bower component transitive dependencies.
diff --git a/lib/js/bower_archives.bzl b/lib/js/bower_archives.bzl
index 60e857e4f6..1597c02848 100644
--- a/lib/js/bower_archives.bzl
+++ b/lib/js/bower_archives.bzl
@@ -149,7 +149,7 @@ def load_bower_archives():
     )
     bower_archive(
         name = "sinonjs",
-        package = "sinonjs",
+        package = "Polymer/sinon.js",
         version = "1.17.1",
         sha1 = "a26a6aab7358807de52ba738770f6ac709afd240",
     )
diff --git a/package.json b/package.json
index b85b695b95..db09e9c4c2 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "fried-twinkie": "^0.2.2",
     "polylint": "^2.10.4",
     "typescript": "^2.x.x",
-    "web-component-tester": "^6.5.0"
+    "web-component-tester": "^6.5.1"
   },
   "scripts": {
     "start": "polygerrit-ui/run-server.sh",