diff --git a/rock.json b/rock.json
index 6b9675e..d0e5502 100644
--- a/rock.json
+++ b/rock.json
@@ -2,6 +2,7 @@
     "configVersion": 1,
     "rock": {
         "name": "io",
+        "version": "0.0.1",
         "gccArgs": [],
         "description": "Input / Output",
         "dependencies": {