diff --git a/package-lock.json b/package-lock.json
index 67ee690..f37d609 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,7 @@
 			"devDependencies": {
 				"eslint-config-wikimedia": "0.21.0",
 				"eslint-plugin-html": "6.1.2",
-				"grunt": "1.5.2",
+				"grunt": "1.5.3",
 				"grunt-contrib-qunit": "4.0.0",
 				"grunt-eslint": "23.0.0",
 				"grunt-stylelint": "0.17.0",
@@ -2706,9 +2706,9 @@
 			"dev": true
 		},
 		"node_modules/grunt": {
-			"version": "1.5.2",
-			"resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.2.tgz",
-			"integrity": "sha512-XCtfaIu72OyDqK24MjWiGC9SwlkuhkS1mrULr1xzuJ2XqAFhP3ZAchZGHJeSCY6mkaOXU4F7SbmmCF7xIVoC9w==",
+			"version": "1.5.3",
+			"resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.3.tgz",
+			"integrity": "sha512-mKwmo4X2d8/4c/BmcOETHek675uOqw0RuA/zy12jaspWqvTp4+ZeQF1W+OTpcbncnaBsfbQJ6l0l4j+Sn/GmaQ==",
 			"dev": true,
 			"dependencies": {
 				"dateformat": "~3.0.3",
@@ -7586,9 +7586,9 @@
 			"dev": true
 		},
 		"grunt": {
-			"version": "1.5.2",
-			"resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.2.tgz",
-			"integrity": "sha512-XCtfaIu72OyDqK24MjWiGC9SwlkuhkS1mrULr1xzuJ2XqAFhP3ZAchZGHJeSCY6mkaOXU4F7SbmmCF7xIVoC9w==",
+			"version": "1.5.3",
+			"resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.3.tgz",
+			"integrity": "sha512-mKwmo4X2d8/4c/BmcOETHek675uOqw0RuA/zy12jaspWqvTp4+ZeQF1W+OTpcbncnaBsfbQJ6l0l4j+Sn/GmaQ==",
 			"dev": true,
 			"requires": {
 				"dateformat": "~3.0.3",
diff --git a/package.json b/package.json
index 9d627dc..e9c70ee 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
 	"devDependencies": {
 		"eslint-config-wikimedia": "0.21.0",
 		"eslint-plugin-html": "6.1.2",
-		"grunt": "1.5.2",
+		"grunt": "1.5.3",
 		"grunt-contrib-qunit": "4.0.0",
 		"grunt-eslint": "23.0.0",
 		"grunt-stylelint": "0.17.0",