diff --git a/package-lock.json b/package-lock.json
index 8ff344cdf..4b6fb2296 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -637,6 +637,11 @@
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@@ -5804,6 +5965,20 @@
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@@ -5983,6 +6158,28 @@
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@@ -6238,6 +6435,29 @@
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@@ -6881,6 +7124,11 @@
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@@ -8567,6 +8812,354 @@
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       "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
-      "dev": true,
       "requires": {
         "async-limiter": "1.0.0",
         "safe-buffer": "5.1.1",
@@ -25499,8 +27059,7 @@
         "ultron": {
           "version": "1.1.1",
           "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
-          "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og==",
-          "dev": true
+          "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og=="
         }
       }
     },
@@ -25531,6 +27090,28 @@
         "xtend": "4.0.1"
       }
     },
+    "xhr-request": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/xhr-request/-/xhr-request-1.1.0.tgz",
+      "integrity": "sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==",
+      "requires": {
+        "buffer-to-arraybuffer": "0.0.5",
+        "object-assign": "4.1.1",
+        "query-string": "5.1.1",
+        "simple-get": "2.8.1",
+        "timed-out": "4.0.1",
+        "url-set-query": "1.0.0",
+        "xhr": "2.4.1"
+      }
+    },
+    "xhr-request-promise": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/xhr-request-promise/-/xhr-request-promise-0.1.2.tgz",
+      "integrity": "sha1-NDxE0e53JrhkgGloLQ+EDIO0Jh0=",
+      "requires": {
+        "xhr-request": "1.1.0"
+      }
+    },
     "xhr2": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/xhr2/-/xhr2-0.1.3.tgz",
@@ -25598,6 +27179,11 @@
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
       "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
     },
+    "yaeti": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
+      "integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc="
+    },
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
diff --git a/package.json b/package.json
index 88f73a609..e9ffb627d 100644
--- a/package.json
+++ b/package.json
@@ -272,7 +272,7 @@
     "stylelint-config-standard": "^18.2.0",
     "tape": "^4.5.1",
     "testem": "^2.0.0",
-    "uglifyify": "^4.0.5",
+    "uglifyify": "github:danfinlay/uglifyify#keep-flags",
     "vinyl-buffer": "^1.0.1",
     "vinyl-source-stream": "^2.0.0",
     "watchify": "^3.9.0"