diff --git a/bump.js b/bump.js
index c30c04c..1bd218c 100644
--- a/bump.js
+++ b/bump.js
@@ -35,10 +35,10 @@ function bump(jsonPath, incrementType) {
   let newVersion
   switch (incrementType) {
   case 'major':
-    newVersion = `${bumped}.${oldVersion[1]}.${oldVersion[2]}`
+    newVersion = `${bumped}.0.0}`
     break
   case 'minor':
-    newVersion = `${oldVersion[0]}.${bumped}.${oldVersion[2]}`
+    newVersion = `${oldVersion[0]}.${bumped}.0}`
     break
   case 'patch':
     newVersion = `${oldVersion[0]}.${oldVersion[1]}.${bumped}`