diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..1dab4ed
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1 @@
+save-exact = true
diff --git a/package.json b/package.json
index ec83dd6..1cf6451 100644
--- a/package.json
+++ b/package.json
@@ -13,10 +13,10 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "expect.js": "^0.3.1",
-    "mocha": "^3.0.2",
-    "serve": "^5.0.0",
-    "xo": "^0.17.0"
+    "expect.js": "0.3.1",
+    "mocha": "3.0.2",
+    "serve": "5.0.0",
+    "xo": "0.17.0"
   },
   "component": {
     "scripts": {