diff --git a/package.json b/package.json
index f7452fa..1c0ec23 100644
--- a/package.json
+++ b/package.json
@@ -29,11 +29,11 @@
         "Konstantin Käfer <kkaefer>"
     ],
     "dependencies": {
-        "optimist": "0.2.x",
+        "optimist": "~0.3.1",
         "sqlite3": "~2.1.1",
-        "step": "0.0.x",
-        "sphericalmercator": "1.0.x",
-        "underscore": "1.1.x"
+        "step": "~0.0.5",
+        "sphericalmercator": "~1.0.1",
+        "underscore": "~1.1.7"
     },
     "devDependencies": {
         "expresso": "~0.9.0"