diff --git a/package.json b/package.json
index 9efcd87..7b594c1 100644
--- a/package.json
+++ b/package.json
@@ -36,9 +36,9 @@
   },
   "homepage": "https://github.com/bigpipe/extendible",
   "devDependencies": {
-    "assume": "1.2.x",
-    "istanbul": "0.3.x",
-    "mocha": "2.2.x",
-    "pre-commit": "1.0.x"
+    "assume": "~1.4.1",
+    "istanbul": "~0.4.5",
+    "mocha": "~3.1.2",
+    "pre-commit": "~1.1.3"
   }
 }