diff --git a/aio/package.json b/aio/package.json
index a956636266..34141bae3a 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -85,7 +85,7 @@
     "rxjs": "^5.5.0",
     "tslib": "^1.7.1",
     "web-animations-js": "^2.2.5",
-    "zone.js": "^0.8.16"
+    "zone.js": "0.8.16"
   },
   "devDependencies": {
     "@angular/cli": "1.5.0-rc.3",
diff --git a/aio/scripts/_payload-limits.sh b/aio/scripts/_payload-limits.sh
index 7f836b15e5..e942355801 100755
--- a/aio/scripts/_payload-limits.sh
+++ b/aio/scripts/_payload-limits.sh
@@ -5,10 +5,10 @@ set -u -e -o pipefail
 declare -A payloadLimits
 payloadLimits["aio", "uncompressed", "inline"]=1600
 payloadLimits["aio", "uncompressed", "main"]=525500
-payloadLimits["aio", "uncompressed", "polyfills"]=40100
+payloadLimits["aio", "uncompressed", "polyfills"]=38000
 payloadLimits["aio", "gzip7", "inline"]=1000
 payloadLimits["aio", "gzip7", "main"]=127000
-payloadLimits["aio", "gzip7", "polyfills"]=13000
+payloadLimits["aio", "gzip7", "polyfills"]=12500
 payloadLimits["aio", "gzip9", "inline"]=1000
 payloadLimits["aio", "gzip9", "main"]=127000
-payloadLimits["aio", "gzip9", "polyfills"]=13000
+payloadLimits["aio", "gzip9", "polyfills"]=12500
diff --git a/aio/yarn.lock b/aio/yarn.lock
index d5e0d277d3..87ec1650ee 100644
--- a/aio/yarn.lock
+++ b/aio/yarn.lock
@@ -9391,6 +9391,10 @@ zip-stream@~0.6.0:
     lodash "~3.10.1"
     readable-stream "~1.0.26"
 
-zone.js@^0.8.14, zone.js@^0.8.16:
+zone.js@0.8.16:
+  version "0.8.16"
+  resolved "https://registry.yarnpkg.com/zone.js/-/zone.js-0.8.16.tgz#ac31b6c418f88c0f918ad6acd8a402aca9313abb"
+
+zone.js@^0.8.14:
   version "0.8.18"
   resolved "https://registry.yarnpkg.com/zone.js/-/zone.js-0.8.18.tgz#8cecb3977fcd1b3090562ff4570e2847e752b48d"