diff --git a/package.json b/package.json
index 683266f..a5b6304 100644
--- a/package.json
+++ b/package.json
@@ -5,17 +5,17 @@
   "main": "index.js",
   "dependencies": {
     "dsv": "0.0.x",
-    "which": "1.1.x",
+    "which": "~1.2.12",
     "mkdirp": "0.5.x"
   },
   "devDependencies": {
-    "istanbul": "0.3.x",
-    "pre-commit": "1.0.x",
-    "mocha": "2.2.x",
-    "sinon": "1.14.x",
-    "sinon-chai": "2.7.x",
-    "chai": "2.3.x",
-    "request": "2.56.x"
+    "istanbul": "~0.4.5",
+    "pre-commit": "~1.1.3",
+    "mocha": "~3.1.2",
+    "sinon": "~1.17.6",
+    "sinon-chai": "~2.8.0",
+    "chai": "~3.5.0",
+    "request": "~2.78.0"
   },
   "scripts": {
     "test": "mocha --ui bdd --reporter spec ./test/*.test.js",