diff --git a/package-lock.json b/package-lock.json
index bb72779..ec8269b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -382,10 +382,16 @@
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+			"integrity": "sha1-On+GgzS0B96gbaFtiNXNKeQ1/s8=",
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@@ -2069,12 +2278,28 @@
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+			"integrity": "sha1-bVuTSkVpk7I9N/QKOC1vFmao5cY=",
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+		"path-root": {
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+			"resolved": "https://registry.npmjs.org/path-root/-/path-root-0.1.1.tgz",
+			"integrity": "sha1-mkpoFMrBwM1zNgqV8yCDyOpHRbc=",
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+			"resolved": "https://registry.npmjs.org/path-root-regex/-/path-root-regex-0.1.2.tgz",
+			"integrity": "sha1-v8zcjfWxLcUsi0PsONGNcsBLqW0=",
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-			"integrity": "sha1-z5Fqsf1fHxbfsggi3W7H9zDCr94=",
+		"rechoir": {
+			"version": "0.7.1",
+			"resolved": "https://registry.npmjs.org/rechoir/-/rechoir-0.7.1.tgz",
+			"integrity": "sha512-/njmZ8s1wVeR6pjTZ+0nCnv8SpZNRMT2D1RLOJQESlYFDBvwpTA4KWJpZ+sBJ4+vhjILRcK7JIFdGCdxEAAitg==",
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@@ -2481,15 +2666,6 @@
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@@ -2505,6 +2681,42 @@
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+			"integrity": "sha1-eaQGRMNivoLybv/nOcm7U4IEb0M=",
+			"dev": true,
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+					"resolved": "https://registry.npmjs.org/global-modules/-/global-modules-1.0.0.tgz",
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+					"dev": true,
+					"requires": {
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+						"is-windows": "^1.0.1",
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+				"global-prefix": {
+					"version": "1.0.2",
+					"resolved": "https://registry.npmjs.org/global-prefix/-/global-prefix-1.0.2.tgz",
+					"integrity": "sha1-2/dDxsFJklk8ZVVoy2btMsASLr4=",
+					"dev": true,
+					"requires": {
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+						"homedir-polyfill": "^1.0.1",
+						"ini": "^1.3.4",
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@@ -2740,24 +2952,6 @@
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@@ -3064,6 +3258,12 @@
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+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
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+			"dev": true
+		},
 		"svg-tags": {
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@@ -3149,12 +3349,6 @@
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@@ -3197,14 +3391,28 @@
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+			"version": "0.1.2",
+			"resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
+			"integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo=",
+			"dev": true
+		},
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+			"version": "3.3.6",
+			"resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.6.tgz",
+			"integrity": "sha512-VoC83HWXmCrF6rgkyxS9GHv8W9Q5nhMKho+OadDJGzL2oDYbYEppBaCMH6pFlwLeqj2QS+hhkw2kpXkSdD1JxQ==",
 			"dev": true,
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-				"sprintf-js": "^1.0.3",
+				"sprintf-js": "^1.1.1",
 				"util-deprecate": "^1.0.2"
+			},
+			"dependencies": {
+				"sprintf-js": {
+					"version": "1.1.2",
+					"resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.1.2.tgz",
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+					"dev": true
+				}
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@@ -3311,6 +3519,15 @@
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 			"dev": true
 		},
+		"v8flags": {
+			"version": "3.2.0",
+			"resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.2.0.tgz",
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+			"dev": true,
+			"requires": {
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+			}
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 		"validate-npm-package-license": {
 			"version": "3.0.4",
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diff --git a/package.json b/package.json
index c21a403..2d88d5a 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
 	},
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 		"eslint-config-wikimedia": "0.15.0",
-		"grunt": "1.1.0",
+		"grunt": "1.5.2",
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 		"grunt-eslint": "22.0.0",
 		"grunt-stylelint": "0.14.0",