diff --git a/action/lib/parse.js b/action/lib/parse.js
index 8bc6dff8..ac7d72e5 100644
--- a/action/lib/parse.js
+++ b/action/lib/parse.js
@@ -45,13 +45,13 @@ export default function ({ title, labels = [], config = [], dependencies = {} })
   const from = title.match(new RegExp('from v?' + regex.semver.source))?.groups
   const to = title.match(new RegExp('to v?' + regex.semver.source))?.groups
 
-  if (!from || !to) {
+  if (!to) {
     core.warning('failed to parse title: no recognizable versions')
     return process.exit(0) // soft exit
   }
 
   // exit early
-  if (!semver.valid(from.version) || !semver.valid(to.version)) {
+  if (!semver.valid(to.version)) {
     core.warning('failed to parse title: invalid semver')
     return process.exit(0) // soft exit
   }
@@ -78,13 +78,17 @@ export default function ({ title, labels = [], config = [], dependencies = {} })
   }
 
   // log
-  core.info(`from: ${from.version}`)
+  core.info(`from: ${from ? from.version : 'unknown'}`)
   core.info(`to: ${to.version}`)
   core.info(`dependency type: ${isProd ? 'production' : 'development'}`)
   core.info(`security critical: ${isSecurity}`)
 
   // analyze with semver
-  const versionChange = semver.diff(from.version, to.version)
+  let versionChange
+
+  if (from && from.version) {
+    versionChange = semver.diff(from.version, to.version)
+  }
 
   // check all configuration variants to see if one matches
   for (const { match: { dependency_name, dependency_type, update_type } } of config) {
@@ -119,6 +123,17 @@ export default function ({ title, labels = [], config = [], dependencies = {} })
           // skip when config is for security update and PR is not security
           if (type === 'security' && !isSecurity) continue
 
+          if (target === 'all') {
+            core.info(`${dependency_name || dependency_type}:${update_type} detected, will auto-merge`)
+            return true
+          }
+
+          // when there is no "from" version, there is no change detected
+          if (!versionChange) {
+            core.warning('no version range detected in PR title')
+            continue
+          }
+
           // evaluate weight of detected change
           if ((weight[target] || 0) >= (weight[versionChange] || 0)) {
           // tell dependabot to merge
diff --git a/action/test/parse/dep-name.js b/action/test/parse/dep-name.js
index 02dfa825..704b9d6a 100644
--- a/action/test/parse/dep-name.js
+++ b/action/test/parse/dep-name.js
@@ -85,7 +85,8 @@ tap.test('parse -> out of range', async assert => {
 tap.test('parse -> edge cases', async assert => {
   const titles = [
     { message: 'Update rake requirement from 10.4.0 to 13.0.0', name: 'rake' },
-    { message: 'Bump actions/cache from v2.0.0 to v2.1.2', name: 'actions/cache' }
+    { message: 'Bump actions/cache from v2.0.0 to v2.1.2', name: 'actions/cache' },
+    { message: 'Update actions/setup-python requirement to v2.1.4', name: 'actions/setup-python' }
   ]
 
   assert.plan(titles.length * 3)
diff --git a/action/test/parse/match-target.js b/action/test/parse/match-target.js
index 04db8c6d..834ad9c0 100644
--- a/action/test/parse/match-target.js
+++ b/action/test/parse/match-target.js
@@ -8,8 +8,8 @@ import fs from 'fs'
 // module
 import parse from '../../lib/parse.js'
 
-function config (target) {
-  return [{ match: { dependency_type: 'all', update_type: `semver:${target}` } }]
+function config (update_type) {
+  return [{ match: { dependency_type: 'all', update_type } }]
 }
 
 tap.test('title -> in range', async assert => {
@@ -20,7 +20,7 @@ tap.test('title -> in range', async assert => {
 
   const options = {
     title: 'chore(deps): bump api-problem from 6.1.2 to 6.1.4 in /path',
-    config: config('major')
+    config: config('semver:major')
   }
 
   assert.ok(parse(options))
@@ -36,6 +36,60 @@ tap.test('title -> in range', async assert => {
   fs.existsSync.restore()
 })
 
+tap.test('title -> in range, no from', async assert => {
+  assert.plan(8)
+
+  sinon.stub(core, 'info')
+  // sinon.stub(core, 'warning')
+  sinon.stub(fs, 'existsSync').returns(false)
+
+  const options = {
+    title: 'Update actions/setup-python requirement to v2.1.4 in /path',
+    config: config('all')
+  }
+
+  assert.ok(parse(options))
+  assert.ok(core.info.called)
+  // assert.ok(core.warning.called)
+  assert.equal(core.info.getCall(0)?.firstArg, 'title: "Update actions/setup-python requirement to v2.1.4 in /path"')
+  assert.equal(core.info.getCall(1)?.firstArg, 'depName: actions/setup-python')
+  assert.equal(core.info.getCall(2)?.firstArg, 'from: unknown')
+  assert.equal(core.info.getCall(3)?.firstArg, 'to: 2.1.4')
+  assert.equal(core.info.getCall(6)?.firstArg, 'config: all:all')
+  assert.equal(core.info.getCall(7)?.firstArg, 'all:all detected, will auto-merge')
+  // assert.equal(core.warning.getCall(0)?.firstArg, 'no version range detected in PR title')
+
+  core.info.restore()
+  fs.existsSync.restore()
+})
+
+tap.test('title -> in range, no from', async assert => {
+  assert.plan(8)
+
+  sinon.stub(core, 'info')
+  // sinon.stub(core, 'warning')
+  sinon.stub(fs, 'existsSync').returns(false)
+
+  const options = {
+    title: 'Update actions/setup-python requirement to v2.1.4 in /path',
+    config: config('semver:all')
+  }
+
+  assert.ok(parse(options))
+  assert.ok(core.info.called)
+  // assert.ok(core.warning.called)
+  assert.equal(core.info.getCall(0)?.firstArg, 'title: "Update actions/setup-python requirement to v2.1.4 in /path"')
+  assert.equal(core.info.getCall(1)?.firstArg, 'depName: actions/setup-python')
+  assert.equal(core.info.getCall(2)?.firstArg, 'from: unknown')
+  assert.equal(core.info.getCall(3)?.firstArg, 'to: 2.1.4')
+  assert.equal(core.info.getCall(6)?.firstArg, 'config: all:semver:all')
+  assert.equal(core.info.getCall(7)?.firstArg, 'all:semver:all detected, will auto-merge')
+  // assert.equal(core.warning.getCall(0)?.firstArg, 'no version range detected in PR title')
+
+  core.info.restore()
+  fs.existsSync.restore()
+})
+
 tap.test('parse -> out of range', async assert => {
   assert.plan(5)
 
@@ -44,7 +98,7 @@ tap.test('parse -> out of range', async assert => {
 
   const options = {
     title: 'chore(deps): bump api-problem from 6.1.2 to 7.0.0 in /path',
-    config: config('patch')
+    config: config('semver:patch')
   }
 
   assert.notOk(parse(options), false)
@@ -56,3 +110,31 @@ tap.test('parse -> out of range', async assert => {
   core.info.restore()
   fs.existsSync.restore()
 })
+
+tap.test('title -> out of range, no from', async assert => {
+  assert.plan(10)
+
+  sinon.stub(core, 'info')
+  sinon.stub(core, 'warning')
+  sinon.stub(fs, 'existsSync').returns(false)
+
+  const options = {
+    title: 'Update actions/setup-python requirement to v2.1.4 in /path',
+    config: config('semver:major')
+  }
+
+  assert.notOk(parse(options))
+  assert.ok(core.info.called)
+  assert.ok(core.warning.called)
+  assert.equal(core.info.getCall(0)?.firstArg, 'title: "Update actions/setup-python requirement to v2.1.4 in /path"')
+  assert.equal(core.info.getCall(1)?.firstArg, 'depName: actions/setup-python')
+  assert.equal(core.info.getCall(2)?.firstArg, 'from: unknown')
+  assert.equal(core.info.getCall(3)?.firstArg, 'to: 2.1.4')
+  assert.equal(core.info.getCall(6)?.firstArg, 'config: all:semver:major')
+  assert.equal(core.info.getCall(7)?.firstArg, 'manual merging required')
+  assert.equal(core.warning.getCall(0)?.firstArg, 'no version range detected in PR title')
+
+  core.info.restore()
+  core.warning.restore()
+  fs.existsSync.restore()
+})