diff --git a/package.json b/package.json
index 49c4241..16102ef 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "rx": "~4.1.0"
   },
   "devDependencies": {
-    "grunt": "^1.5.2",
+    "grunt": "^1.5.3",
     "grunt-cli": "^1.2.0",
     "grunt-contrib-clean": "^1.0.0",
     "grunt-contrib-concat": "^0.5.1",
diff --git a/yarn.lock b/yarn.lock
index e343cda..106d06a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -845,10 +845,10 @@ grunt-tsd@^0.2.0-beta.1:
   dependencies:
     tsd "0.6.0-beta.5"
 
-grunt@^1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/grunt/-/grunt-1.5.2.tgz#46b014e28d17c85baac19d5e891bb3f04923c098"
-  integrity sha512-XCtfaIu72OyDqK24MjWiGC9SwlkuhkS1mrULr1xzuJ2XqAFhP3ZAchZGHJeSCY6mkaOXU4F7SbmmCF7xIVoC9w==
+grunt@^1.5.3:
+  version "1.5.3"
+  resolved "https://registry.yarnpkg.com/grunt/-/grunt-1.5.3.tgz#3214101d11257b7e83cf2b38ea173b824deab76a"
+  integrity sha512-mKwmo4X2d8/4c/BmcOETHek675uOqw0RuA/zy12jaspWqvTp4+ZeQF1W+OTpcbncnaBsfbQJ6l0l4j+Sn/GmaQ==
   dependencies:
     dateformat "~3.0.3"
     eventemitter2 "~0.4.13"