diff --git a/package.json b/package.json
index d204e173..d5e65858 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "url": "https://github.com/phetsims/ratio-and-proportion.git"
   },
   "devDependencies": {
-    "grunt": "~1.1.0"
+    "grunt": "~1.4.0"
   },
   "phet": {
     "requirejsNamespace": "RATIO_AND_PROPORTION",
diff --git a/ratio-and-proportion-tests.html b/ratio-and-proportion-tests.html
index f5742847..26f60994 100644
--- a/ratio-and-proportion-tests.html
+++ b/ratio-and-proportion-tests.html
@@ -30,7 +30,7 @@
         "url": "https://github.com/phetsims/ratio-and-proportion.git"
       },
       "devDependencies": {
-        "grunt": "~1.1.0"
+        "grunt": "~1.4.0"
       },
       "phet": {
         "requirejsNamespace": "RATIO_AND_PROPORTION",
diff --git a/ratio-and-proportion_en.html b/ratio-and-proportion_en.html
index ede9583f..c263232e 100644
--- a/ratio-and-proportion_en.html
+++ b/ratio-and-proportion_en.html
@@ -29,7 +29,7 @@
         "url": "https://github.com/phetsims/ratio-and-proportion.git"
       },
       "devDependencies": {
-        "grunt": "~1.1.0"
+        "grunt": "~1.4.0"
       },
       "phet": {
         "requirejsNamespace": "RATIO_AND_PROPORTION",