diff --git a/lib/type/analyze.js b/lib/type/analyze.js
new file mode 100644
index 00000000..966bb833
--- /dev/null
+++ b/lib/type/analyze.js
@@ -0,0 +1,20 @@
+'use strict'
+
+module.exports = function (commits) {
+  var type = null
+
+  commits.every(function (commit) {
+    if (commit.breaks.length) {
+      type = 'major'
+      return false
+    }
+
+    if (commit.type === 'feat') type = 'minor'
+
+    if (!type && commit.type === 'fix') type = 'patch'
+
+    return true
+  })
+
+  return type
+}
diff --git a/lib/type/commits.js b/lib/type/commits.js
new file mode 100644
index 00000000..5cbe98e1
--- /dev/null
+++ b/lib/type/commits.js
@@ -0,0 +1,14 @@
+'use strict'
+
+var git = require('conventional-changelog/lib/git')
+
+module.exports = function (cb) {
+  git.latestTag(function (err, from) {
+    if (err) return cb(err)
+
+    git.getCommits({from: from}, function (err, commits) {
+      if (err) return cb(err)
+      cb(null, commits)
+    })
+  })
+}
diff --git a/lib/type/index.js b/lib/type/index.js
new file mode 100644
index 00000000..e17115ae
--- /dev/null
+++ b/lib/type/index.js
@@ -0,0 +1,12 @@
+'use strict'
+
+var commits = require('./commits')
+var analyze = require('./analyze')
+
+module.exports = function (cb) {
+  commits(function (err, commits) {
+    if (err) return cb(err)
+
+    cb(null, analyze(commits))
+  })
+}
diff --git a/lib/version.js b/lib/version.js
new file mode 100644
index 00000000..bc0d0a14
--- /dev/null
+++ b/lib/version.js
@@ -0,0 +1,18 @@
+'use strict'
+
+var exec = require('child_process').exec
+var unlink = require('fs').unlinkSync
+
+module.exports = function (pkg, cb) {
+  if (!pkg.name) return cb('Package must have a name')
+
+  exec('npm show ' + pkg.name + ' version', function(err, stdout, stderr) {
+    if (err) unlink('./npm-debug.log')
+
+    if (err && /is not in the npm registry/m.test(stderr)) return cb(null, null, true)
+
+    if (err) return cb(err)
+
+    cb(null, stdout.trim())
+  })
+}
diff --git a/src/pre.js b/src/pre.js
new file mode 100644
index 00000000..4ecdf919
--- /dev/null
+++ b/src/pre.js
@@ -0,0 +1,26 @@
+'use strict'
+
+var fs = require('fs')
+
+var semver = require('semver')
+
+var type = require('../lib/type')
+var version = require('../lib/version')
+
+module.exports = function (options, cb) {
+  type(function (err, type) {
+    if (err) return cb(err)
+    if (!type) return cb(null, null)
+
+    var path = './package.json'
+    var pkg = JSON.parse(fs.readFileSync(path))
+    version(pkg, function (err, version, unpublished) {
+      if (err) return cb(err)
+
+      pkg.version = unpublished ? '1.0.0' : semver.inc(version, type)
+      if (!options.debug) fs.writeFileSync(path, JSON.stringify(pkg, null, 2))
+
+      cb(null, pkg.version)
+    })
+  })
+}