diff --git a/package.json b/package.json
index 4c2e636..7344960 100644
--- a/package.json
+++ b/package.json
@@ -30,16 +30,16 @@
   },
   "homepage": "https://unexpected.js.org/unexpected-set",
   "devDependencies": {
-    "coveralls": "3.0.0",
-    "eslint": "2.13.1",
-    "eslint-config-onelint": "1.2.0",
-    "istanbul": "0.4.5",
-    "mocha": "2.4.5",
-    "unexpected": "10.37.4",
+    "coveralls": "^3.0.0",
+    "eslint": "^2.13.1",
+    "eslint-config-onelint": "^1.2.0",
+    "istanbul": "^0.4.5",
+    "mocha": "^2.4.5",
+    "unexpected": "^10.37.4",
     "unexpected-documentation-site-generator": "^4.0.0",
     "unexpected-markdown": "^1.3.4"
   },
   "dependencies": {
-    "es6-set": "0.1.5"
+    "es6-set": "^0.1.5"
   }
 }