diff --git a/script/tool/CHANGELOG.md b/script/tool/CHANGELOG.md
index 04101c228793..4b40aecefa9a 100644
--- a/script/tool/CHANGELOG.md
+++ b/script/tool/CHANGELOG.md
@@ -1,5 +1,7 @@
-## NEXT
+## 0.8.6
 
+- Adds `update-release-info` to apply changelog and optional version changes
+  across multiple packages.
 - Fixes changelog validation when reverting to a `NEXT` state.
 - Fixes multiplication of `--force` flag when publishing multiple packages.
 - Adds minimum deployment target flags to `xcode-analyze` to allow
diff --git a/script/tool/README.md b/script/tool/README.md
index d52ee08fdc34..cc9621f44086 100644
--- a/script/tool/README.md
+++ b/script/tool/README.md
@@ -118,6 +118,31 @@ cd <repository root>
 dart run ./script/tool/bin/flutter_plugin_tools.dart update-excerpts --packages plugin_name
 ```
 
+### Update CHANGELOG and Version
+
+`update-release-info` will automatically update the version and `CHANGELOG.md`
+following standard repository style and practice. It can be used for
+single-package updates to handle the details of getting the `CHANGELOG.md`
+format correct, but is especially useful for bulk updates across multiple packages.
+
+For instance, if you add a new analysis option that requires production
+code changes across many packages:
+
+```sh
+cd <repository root>
+dart run ./script/tool/bin/flutter_plugin_tools.dart update-release-info \
+  --version=minimal \
+  --changelog="Fixes violations of new analysis option some_new_option."
+```
+
+The `minimal` option for `--version` will skip unchanged packages, and treat
+each changed package as either `bugfix` or `next` depending on the files that
+have changed in that package, so it is often the best choice for a bulk change.
+
+For cases where you know the change time, `minor` or `bugfix` will make the
+corresponding version bump, or `next` will update only `CHANGELOG.md` without
+changing the version.
+
 ### Publish a Release
 
 **Releases are automated for `flutter/plugins` and `flutter/packages`.**
diff --git a/script/tool/lib/src/common/package_state_utils.dart b/script/tool/lib/src/common/package_state_utils.dart
new file mode 100644
index 000000000000..437bbf6df370
--- /dev/null
+++ b/script/tool/lib/src/common/package_state_utils.dart
@@ -0,0 +1,95 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:meta/meta.dart';
+import 'package:path/path.dart' as p;
+
+import 'repository_package.dart';
+
+/// The state of a package on disk relative to git state.
+@immutable
+class PackageChangeState {
+  /// Creates a new immutable state instance.
+  const PackageChangeState({
+    required this.hasChanges,
+    required this.hasChangelogChange,
+    required this.needsVersionChange,
+  });
+
+  /// True if there are any changes to files in the package.
+  final bool hasChanges;
+
+  /// True if the package's CHANGELOG.md has been changed.
+  final bool hasChangelogChange;
+
+  /// True if any changes in the package require a version change according
+  /// to repository policy.
+  final bool needsVersionChange;
+}
+
+/// Checks [package] against [changedPaths] to determine what changes it has
+/// and how those changes relate to repository policy about CHANGELOG and
+/// version updates.
+///
+/// [changedPaths] should be a list of POSIX-style paths from a common root,
+/// and [relativePackagePath] should be the path to [package] from that same
+/// root. Commonly these will come from `gitVersionFinder.getChangedFiles()`
+/// and `getRelativePoixPath(package.directory, gitDir.path)` respectively;
+/// they are arguments mainly to allow for caching the changed paths for an
+/// entire command run.
+PackageChangeState checkPackageChangeState(
+  RepositoryPackage package, {
+  required List<String> changedPaths,
+  required String relativePackagePath,
+}) {
+  final String packagePrefix = relativePackagePath.endsWith('/')
+      ? relativePackagePath
+      : '$relativePackagePath/';
+
+  bool hasChanges = false;
+  bool hasChangelogChange = false;
+  bool needsVersionChange = false;
+  for (final String path in changedPaths) {
+    // Only consider files within the package.
+    if (!path.startsWith(packagePrefix)) {
+      continue;
+    }
+    final String packageRelativePath = path.substring(packagePrefix.length);
+    hasChanges = true;
+
+    final List<String> components = p.posix.split(packageRelativePath);
+    if (components.isEmpty) {
+      continue;
+    }
+    final bool isChangelog = components.first == 'CHANGELOG.md';
+    if (isChangelog) {
+      hasChangelogChange = true;
+    }
+
+    if (!needsVersionChange &&
+        !isChangelog &&
+        // One of a few special files example will be shown on pub.dev, but for
+        // anything else in the example publishing has no purpose.
+        !(components.first == 'example' &&
+            !<String>{'main.dart', 'readme.md', 'example.md'}
+                .contains(components.last.toLowerCase())) &&
+        // Changes to tests don't need to be published.
+        !components.contains('test') &&
+        !components.contains('androidTest') &&
+        !components.contains('RunnerTests') &&
+        !components.contains('RunnerUITests') &&
+        // The top-level "tool" directory is for non-client-facing utility code,
+        // so doesn't need to be published.
+        components.first != 'tool' &&
+        // Ignoring lints doesn't affect clients.
+        !components.contains('lint-baseline.xml')) {
+      needsVersionChange = true;
+    }
+  }
+
+  return PackageChangeState(
+      hasChanges: hasChanges,
+      hasChangelogChange: hasChangelogChange,
+      needsVersionChange: needsVersionChange);
+}
diff --git a/script/tool/lib/src/main.dart b/script/tool/lib/src/main.dart
index 9c572ee270e0..739aef56878d 100644
--- a/script/tool/lib/src/main.dart
+++ b/script/tool/lib/src/main.dart
@@ -29,6 +29,7 @@ import 'pubspec_check_command.dart';
 import 'readme_check_command.dart';
 import 'test_command.dart';
 import 'update_excerpts_command.dart';
+import 'update_release_info_command.dart';
 import 'version_check_command.dart';
 import 'xcode_analyze_command.dart';
 
@@ -70,6 +71,7 @@ void main(List<String> args) {
     ..addCommand(ReadmeCheckCommand(packagesDir))
     ..addCommand(TestCommand(packagesDir))
     ..addCommand(UpdateExcerptsCommand(packagesDir))
+    ..addCommand(UpdateReleaseInfoCommand(packagesDir))
     ..addCommand(VersionCheckCommand(packagesDir))
     ..addCommand(XcodeAnalyzeCommand(packagesDir));
 
diff --git a/script/tool/lib/src/update_release_info_command.dart b/script/tool/lib/src/update_release_info_command.dart
new file mode 100644
index 000000000000..b998615ead17
--- /dev/null
+++ b/script/tool/lib/src/update_release_info_command.dart
@@ -0,0 +1,310 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:args/command_runner.dart';
+import 'package:file/file.dart';
+import 'package:flutter_plugin_tools/src/common/core.dart';
+import 'package:git/git.dart';
+import 'package:pub_semver/pub_semver.dart';
+import 'package:yaml_edit/yaml_edit.dart';
+
+import 'common/git_version_finder.dart';
+import 'common/package_looping_command.dart';
+import 'common/package_state_utils.dart';
+import 'common/repository_package.dart';
+
+/// Supported version change types, from smallest to largest component.
+enum _VersionIncrementType { build, bugfix, minor }
+
+/// Possible results of attempting to update a CHANGELOG.md file.
+enum _ChangelogUpdateOutcome { addedSection, updatedSection, failed }
+
+/// A state machine for the process of updating a CHANGELOG.md.
+enum _ChangelogUpdateState {
+  /// Looking for the first version section.
+  findingFirstSection,
+
+  /// Looking for the first list entry in an existing section.
+  findingFirstListItem,
+
+  /// Finished with updates.
+  finishedUpdating,
+}
+
+/// A command to update the changelog, and optionally version, of packages.
+class UpdateReleaseInfoCommand extends PackageLoopingCommand {
+  /// Creates a publish metadata updater command instance.
+  UpdateReleaseInfoCommand(
+    Directory packagesDir, {
+    GitDir? gitDir,
+  }) : super(packagesDir, gitDir: gitDir) {
+    argParser.addOption(_changelogFlag,
+        mandatory: true,
+        help: 'The changelog entry to add. '
+            'Each line will be a separate list entry.');
+    argParser.addOption(_versionTypeFlag,
+        mandatory: true,
+        help: 'The version change level',
+        allowed: <String>[
+          _versionNext,
+          _versionMinimal,
+          _versionBugfix,
+          _versionMinor,
+        ],
+        allowedHelp: <String, String>{
+          _versionNext:
+              'No version change; just adds a NEXT entry to the changelog.',
+          _versionBugfix: 'Increments the bugfix version.',
+          _versionMinor: 'Increments the minor version.',
+          _versionMinimal: 'Depending on the changes to each package: '
+              'increments the bugfix version (for publishable changes), '
+              "uses NEXT (for changes that don't need to be published), "
+              'or skips (if no changes).',
+        });
+  }
+
+  static const String _changelogFlag = 'changelog';
+  static const String _versionTypeFlag = 'version';
+
+  static const String _versionNext = 'next';
+  static const String _versionBugfix = 'bugfix';
+  static const String _versionMinor = 'minor';
+  static const String _versionMinimal = 'minimal';
+
+  // The version change type, if there is a set type for all platforms.
+  //
+  // If null, either there is no version change, or it is dynamic (`minimal`).
+  _VersionIncrementType? _versionChange;
+
+  // The cache of changed files, for dynamic version change determination.
+  //
+  // Only set for `minimal` version change.
+  late final List<String> _changedFiles;
+
+  @override
+  final String name = 'update-release-info';
+
+  @override
+  final String description = 'Updates CHANGELOG.md files, and optionally the '
+      'version in pubspec.yaml, in a way that is consistent with version-check '
+      'enforcement.';
+
+  @override
+  bool get hasLongOutput => false;
+
+  @override
+  Future<void> initializeRun() async {
+    if (getStringArg(_changelogFlag).trim().isEmpty) {
+      throw UsageException('Changelog message must not be empty.', usage);
+    }
+    switch (getStringArg(_versionTypeFlag)) {
+      case _versionMinor:
+        _versionChange = _VersionIncrementType.minor;
+        break;
+      case _versionBugfix:
+        _versionChange = _VersionIncrementType.bugfix;
+        break;
+      case _versionMinimal:
+        final GitVersionFinder gitVersionFinder = await retrieveVersionFinder();
+        _changedFiles = await gitVersionFinder.getChangedFiles();
+        // Anothing other than a fixed change is null.
+        _versionChange = null;
+        break;
+      case _versionNext:
+        _versionChange = null;
+        break;
+      default:
+        throw UnimplementedError('Unimplemented version change type');
+    }
+  }
+
+  @override
+  Future<PackageResult> runForPackage(RepositoryPackage package) async {
+    String nextVersionString;
+
+    _VersionIncrementType? versionChange = _versionChange;
+
+    // If the change type is `minimal` determine what changes, if any, are
+    // needed.
+    if (versionChange == null &&
+        getStringArg(_versionTypeFlag) == _versionMinimal) {
+      final Directory gitRoot =
+          packagesDir.fileSystem.directory((await gitDir).path);
+      final String relativePackagePath =
+          getRelativePosixPath(package.directory, from: gitRoot);
+      final PackageChangeState state = checkPackageChangeState(package,
+          changedPaths: _changedFiles,
+          relativePackagePath: relativePackagePath);
+
+      if (!state.hasChanges) {
+        return PackageResult.skip('No changes to package');
+      }
+      if (state.needsVersionChange) {
+        versionChange = _VersionIncrementType.bugfix;
+      }
+    }
+
+    if (versionChange != null) {
+      final Version? updatedVersion =
+          _updatePubspecVersion(package, versionChange);
+      if (updatedVersion == null) {
+        return PackageResult.fail(
+            <String>['Could not determine current version.']);
+      }
+      nextVersionString = updatedVersion.toString();
+      print('${indentation}Incremented version to $nextVersionString.');
+    } else {
+      nextVersionString = 'NEXT';
+    }
+
+    final _ChangelogUpdateOutcome updateOutcome =
+        _updateChangelog(package, nextVersionString);
+    switch (updateOutcome) {
+      case _ChangelogUpdateOutcome.addedSection:
+        print('${indentation}Added a $nextVersionString section.');
+        break;
+      case _ChangelogUpdateOutcome.updatedSection:
+        print('${indentation}Updated NEXT section.');
+        break;
+      case _ChangelogUpdateOutcome.failed:
+        return PackageResult.fail(<String>['Could not update CHANGELOG.md.']);
+    }
+
+    return PackageResult.success();
+  }
+
+  _ChangelogUpdateOutcome _updateChangelog(
+      RepositoryPackage package, String version) {
+    if (!package.changelogFile.existsSync()) {
+      printError('${indentation}Missing CHANGELOG.md.');
+      return _ChangelogUpdateOutcome.failed;
+    }
+
+    final String newHeader = '## $version';
+    final RegExp listItemPattern = RegExp(r'^(\s*[-*])');
+
+    final StringBuffer newChangelog = StringBuffer();
+    _ChangelogUpdateState state = _ChangelogUpdateState.findingFirstSection;
+    bool updatedExistingSection = false;
+
+    for (final String line in package.changelogFile.readAsLinesSync()) {
+      switch (state) {
+        case _ChangelogUpdateState.findingFirstSection:
+          final String trimmedLine = line.trim();
+          if (trimmedLine.isEmpty) {
+            // Discard any whitespace at the top of the file.
+          } else if (trimmedLine == '## NEXT') {
+            // Replace the header with the new version (which may also be NEXT).
+            newChangelog.writeln(newHeader);
+            // Find the existing list to add to.
+            state = _ChangelogUpdateState.findingFirstListItem;
+          } else {
+            // The first content in the file isn't a NEXT section, so just add
+            // the new section.
+            <String>[
+              newHeader,
+              '',
+              ..._changelogAdditionsAsList(),
+              '',
+              line, // Don't drop the current line.
+            ].forEach(newChangelog.writeln);
+            state = _ChangelogUpdateState.finishedUpdating;
+          }
+          break;
+        case _ChangelogUpdateState.findingFirstListItem:
+          final RegExpMatch? match = listItemPattern.firstMatch(line);
+          if (match != null) {
+            final String listMarker = match[1]!;
+            // Add the new items on top. If the new change is changing the
+            // version, then the new item should be more relevant to package
+            // clients than anything that was already there. If it's still
+            // NEXT, the order doesn't matter.
+            <String>[
+              ..._changelogAdditionsAsList(listMarker: listMarker),
+              line, // Don't drop the current line.
+            ].forEach(newChangelog.writeln);
+            state = _ChangelogUpdateState.finishedUpdating;
+            updatedExistingSection = true;
+          } else if (line.trim().isEmpty) {
+            // Scan past empty lines, but keep them.
+            newChangelog.writeln(line);
+          } else {
+            printError('  Existing NEXT section has unrecognized format.');
+            return _ChangelogUpdateOutcome.failed;
+          }
+          break;
+        case _ChangelogUpdateState.finishedUpdating:
+          // Once changes are done, add the rest of the lines as-is.
+          newChangelog.writeln(line);
+          break;
+      }
+    }
+
+    package.changelogFile.writeAsStringSync(newChangelog.toString());
+
+    return updatedExistingSection
+        ? _ChangelogUpdateOutcome.updatedSection
+        : _ChangelogUpdateOutcome.addedSection;
+  }
+
+  /// Returns the changelog to add as a Markdown list, using the given list
+  /// bullet style (default to the repository standard of '*'), and adding
+  /// any missing periods.
+  ///
+  /// E.g., 'A line\nAnother line.' will become:
+  /// ```
+  /// [ '* A line.', '* Another line.' ]
+  /// ```
+  Iterable<String> _changelogAdditionsAsList({String listMarker = '*'}) {
+    return getStringArg(_changelogFlag).split('\n').map((String entry) {
+      String standardizedEntry = entry.trim();
+      if (!standardizedEntry.endsWith('.')) {
+        standardizedEntry = '$standardizedEntry.';
+      }
+      return '$listMarker $standardizedEntry';
+    });
+  }
+
+  /// Updates the version in [package]'s pubspec according to [type], returning
+  /// the new version, or null if there was an error updating the version.
+  Version? _updatePubspecVersion(
+      RepositoryPackage package, _VersionIncrementType type) {
+    final Pubspec pubspec = package.parsePubspec();
+    final Version? currentVersion = pubspec.version;
+    if (currentVersion == null) {
+      printError('${indentation}No version in pubspec.yaml');
+      return null;
+    }
+
+    // For versions less than 1.0, shift the change down one component per
+    // Dart versioning conventions.
+    final _VersionIncrementType adjustedType = currentVersion.major > 0
+        ? type
+        : _VersionIncrementType.values[type.index - 1];
+
+    final Version newVersion = _nextVersion(currentVersion, adjustedType);
+
+    // Write the new version to the pubspec.
+    final YamlEditor editablePubspec =
+        YamlEditor(package.pubspecFile.readAsStringSync());
+    editablePubspec.update(<String>['version'], newVersion.toString());
+    package.pubspecFile.writeAsStringSync(editablePubspec.toString());
+
+    return newVersion;
+  }
+
+  Version _nextVersion(Version version, _VersionIncrementType type) {
+    switch (type) {
+      case _VersionIncrementType.minor:
+        return version.nextMinor;
+      case _VersionIncrementType.bugfix:
+        return version.nextPatch;
+      case _VersionIncrementType.build:
+        final int buildNumber =
+            version.build.isEmpty ? 0 : version.build.first as int;
+        return Version(version.major, version.minor, version.patch,
+            build: '${buildNumber + 1}');
+    }
+  }
+}
diff --git a/script/tool/lib/src/version_check_command.dart b/script/tool/lib/src/version_check_command.dart
index b816ee56999c..62abdb2a432b 100644
--- a/script/tool/lib/src/version_check_command.dart
+++ b/script/tool/lib/src/version_check_command.dart
@@ -13,6 +13,7 @@ import 'package:pub_semver/pub_semver.dart';
 import 'common/core.dart';
 import 'common/git_version_finder.dart';
 import 'common/package_looping_command.dart';
+import 'common/package_state_utils.dart';
 import 'common/process_runner.dart';
 import 'common/pub_version_finder.dart';
 import 'common/repository_package.dart';
@@ -531,44 +532,16 @@ ${indentation}The first version listed in CHANGELOG.md is $fromChangeLog.
     final Directory gitRoot =
         packagesDir.fileSystem.directory((await gitDir).path);
     final String relativePackagePath =
-        '${getRelativePosixPath(package.directory, from: gitRoot)}/';
-    bool hasChanges = false;
-    bool needsVersionChange = false;
-    bool hasChangelogChange = false;
-    for (final String path in _changedFiles) {
-      // Only consider files within the package.
-      if (!path.startsWith(relativePackagePath)) {
-        continue;
-      }
-      hasChanges = true;
-
-      final List<String> components = p.posix.split(path);
-      final bool isChangelog = components.last == 'CHANGELOG.md';
-      if (isChangelog) {
-        hasChangelogChange = true;
-      }
+        getRelativePosixPath(package.directory, from: gitRoot);
 
-      if (!needsVersionChange &&
-          !isChangelog &&
-          // The example's main.dart is shown on pub.dev, but for anything else
-          // in the example publishing has no purpose.
-          !(components.contains('example') && components.last != 'main.dart') &&
-          // Changes to tests don't need to be published.
-          !components.contains('test') &&
-          !components.contains('androidTest') &&
-          !components.contains('RunnerTests') &&
-          !components.contains('RunnerUITests') &&
-          // Ignoring lints doesn't affect clients.
-          !components.contains('lint-baseline.xml')) {
-        needsVersionChange = true;
-      }
-    }
+    final PackageChangeState state = checkPackageChangeState(package,
+        changedPaths: _changedFiles, relativePackagePath: relativePackagePath);
 
-    if (!hasChanges) {
+    if (!state.hasChanges) {
       return null;
     }
 
-    if (needsVersionChange) {
+    if (state.needsVersionChange) {
       if (_getChangeDescription().split('\n').any((String line) =>
           line.startsWith(_missingVersionChangeJustificationMarker))) {
         logWarning('Ignoring lack of version change due to '
@@ -586,7 +559,7 @@ ${indentation}The first version listed in CHANGELOG.md is $fromChangeLog.
       }
     }
 
-    if (!hasChangelogChange) {
+    if (!state.hasChangelogChange) {
       if (_getChangeDescription().split('\n').any((String line) =>
           line.startsWith(_missingChangelogChangeJustificationMarker))) {
         logWarning('Ignoring lack of CHANGELOG update due to '
diff --git a/script/tool/pubspec.yaml b/script/tool/pubspec.yaml
index 32bfc1b62281..138c1183fa1c 100644
--- a/script/tool/pubspec.yaml
+++ b/script/tool/pubspec.yaml
@@ -1,7 +1,7 @@
 name: flutter_plugin_tools
 description: Productivity utils for flutter/plugins and flutter/packages
 repository: https://github.com/flutter/plugins/tree/main/script/tool
-version: 0.8.5
+version: 0.8.6
 
 dependencies:
   args: ^2.1.0
diff --git a/script/tool/test/common/package_state_utils_test.dart b/script/tool/test/common/package_state_utils_test.dart
new file mode 100644
index 000000000000..cc9116a9ea25
--- /dev/null
+++ b/script/tool/test/common/package_state_utils_test.dart
@@ -0,0 +1,140 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+import 'package:file/file.dart';
+import 'package:file/memory.dart';
+import 'package:flutter_plugin_tools/src/common/package_state_utils.dart';
+import 'package:test/test.dart';
+
+import '../util.dart';
+
+void main() {
+  late FileSystem fileSystem;
+  late Directory packagesDir;
+
+  setUp(() {
+    fileSystem = MemoryFileSystem();
+    packagesDir = createPackagesDirectory(fileSystem: fileSystem);
+  });
+
+  group('checkPackageChangeState', () {
+    test('reports version change needed for code changes', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir);
+
+      const List<String> changedFiles = <String>[
+        'packages/a_package/lib/plugin.dart',
+      ];
+
+      final PackageChangeState state = checkPackageChangeState(package,
+          changedPaths: changedFiles,
+          relativePackagePath: 'packages/a_package');
+
+      expect(state.hasChanges, true);
+      expect(state.needsVersionChange, true);
+    });
+
+    test('handles trailing slash on package path', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir);
+
+      const List<String> changedFiles = <String>[
+        'packages/a_package/lib/plugin.dart',
+      ];
+
+      final PackageChangeState state = checkPackageChangeState(package,
+          changedPaths: changedFiles,
+          relativePackagePath: 'packages/a_package/');
+
+      expect(state.hasChanges, true);
+      expect(state.needsVersionChange, true);
+      expect(state.hasChangelogChange, false);
+    });
+
+    test('does not report version change exempt changes', () async {
+      final RepositoryPackage package =
+          createFakePlugin('a_plugin', packagesDir);
+
+      const List<String> changedFiles = <String>[
+        'packages/a_plugin/example/android/lint-baseline.xml',
+        'packages/a_plugin/example/android/src/androidTest/foo/bar/FooTest.java',
+        'packages/a_plugin/example/ios/RunnerTests/Foo.m',
+        'packages/a_plugin/example/ios/RunnerUITests/info.plist',
+        'packages/a_plugin/tool/a_development_tool.dart',
+        'packages/a_plugin/CHANGELOG.md',
+      ];
+
+      final PackageChangeState state = checkPackageChangeState(package,
+          changedPaths: changedFiles,
+          relativePackagePath: 'packages/a_plugin/');
+
+      expect(state.hasChanges, true);
+      expect(state.needsVersionChange, false);
+      expect(state.hasChangelogChange, true);
+    });
+
+    test('only considers a root "tool" folder to be special', () async {
+      final RepositoryPackage package =
+          createFakePlugin('a_plugin', packagesDir);
+
+      const List<String> changedFiles = <String>[
+        'packages/a_plugin/lib/foo/tool/tool_thing.dart',
+      ];
+
+      final PackageChangeState state = checkPackageChangeState(package,
+          changedPaths: changedFiles,
+          relativePackagePath: 'packages/a_plugin/');
+
+      expect(state.hasChanges, true);
+      expect(state.needsVersionChange, true);
+    });
+
+    test('requires a version change for example main', () async {
+      final RepositoryPackage package =
+          createFakePlugin('a_plugin', packagesDir);
+
+      const List<String> changedFiles = <String>[
+        'packages/a_plugin/example/lib/main.dart',
+      ];
+
+      final PackageChangeState state = checkPackageChangeState(package,
+          changedPaths: changedFiles,
+          relativePackagePath: 'packages/a_plugin/');
+
+      expect(state.hasChanges, true);
+      expect(state.needsVersionChange, true);
+    });
+
+    test('requires a version change for example readme.md', () async {
+      final RepositoryPackage package =
+          createFakePlugin('a_plugin', packagesDir);
+
+      const List<String> changedFiles = <String>[
+        'packages/a_plugin/example/README.md',
+      ];
+
+      final PackageChangeState state = checkPackageChangeState(package,
+          changedPaths: changedFiles,
+          relativePackagePath: 'packages/a_plugin/');
+
+      expect(state.hasChanges, true);
+      expect(state.needsVersionChange, true);
+    });
+
+    test('requires a version change for example example.md', () async {
+      final RepositoryPackage package =
+          createFakePlugin('a_plugin', packagesDir);
+
+      const List<String> changedFiles = <String>[
+        'packages/a_plugin/example/lib/example.md',
+      ];
+
+      final PackageChangeState state = checkPackageChangeState(package,
+          changedPaths: changedFiles,
+          relativePackagePath: 'packages/a_plugin/');
+
+      expect(state.hasChanges, true);
+      expect(state.needsVersionChange, true);
+    });
+  });
+}
diff --git a/script/tool/test/update_release_info_command_test.dart b/script/tool/test/update_release_info_command_test.dart
new file mode 100644
index 000000000000..7e7ff54d5947
--- /dev/null
+++ b/script/tool/test/update_release_info_command_test.dart
@@ -0,0 +1,645 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io' as io;
+
+import 'package:args/command_runner.dart';
+import 'package:file/file.dart';
+import 'package:file/memory.dart';
+import 'package:flutter_plugin_tools/src/common/core.dart';
+import 'package:flutter_plugin_tools/src/update_release_info_command.dart';
+import 'package:mockito/mockito.dart';
+import 'package:test/test.dart';
+
+import 'common/plugin_command_test.mocks.dart';
+import 'mocks.dart';
+import 'util.dart';
+
+void main() {
+  late FileSystem fileSystem;
+  late Directory packagesDir;
+  late MockGitDir gitDir;
+  late RecordingProcessRunner processRunner;
+  late CommandRunner<void> runner;
+
+  setUp(() {
+    fileSystem = MemoryFileSystem();
+    packagesDir = createPackagesDirectory(fileSystem: fileSystem);
+    processRunner = RecordingProcessRunner();
+
+    gitDir = MockGitDir();
+    when(gitDir.path).thenReturn(packagesDir.parent.path);
+    when(gitDir.runCommand(any, throwOnError: anyNamed('throwOnError')))
+        .thenAnswer((Invocation invocation) {
+      final List<String> arguments =
+          invocation.positionalArguments[0]! as List<String>;
+      // Route git calls through a process runner, to make mock output
+      // consistent with other processes. Attach the first argument to the
+      // command to make targeting the mock results easier.
+      final String gitCommand = arguments.removeAt(0);
+      return processRunner.run('git-$gitCommand', arguments);
+    });
+
+    final UpdateReleaseInfoCommand command = UpdateReleaseInfoCommand(
+      packagesDir,
+      gitDir: gitDir,
+    );
+    runner = CommandRunner<void>(
+        'update_release_info_command', 'Test for update_release_info_command');
+    runner.addCommand(command);
+  });
+
+  group('flags', () {
+    test('fails if --changelog is missing', () async {
+      Exception? commandError;
+      await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=next',
+      ], exceptionHandler: (Exception e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<UsageException>());
+    });
+
+    test('fails if --changelog is blank', () async {
+      Exception? commandError;
+      await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=next',
+        '--changelog',
+        '',
+      ], exceptionHandler: (Exception e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<UsageException>());
+    });
+
+    test('fails if --version is missing', () async {
+      Exception? commandError;
+      await runCapturingPrint(
+          runner, <String>['update-release-info', '--changelog', ''],
+          exceptionHandler: (Exception e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<UsageException>());
+    });
+
+    test('fails if --version is an unknown value', () async {
+      Exception? commandError;
+      await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=foo',
+        '--changelog',
+        '',
+      ], exceptionHandler: (Exception e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<UsageException>());
+    });
+  });
+
+  group('changelog', () {
+    test('adds new NEXT section', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      const String originalChangelog = '''
+## 1.0.0
+
+* Previous changes.
+''';
+      package.changelogFile.writeAsStringSync(originalChangelog);
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=next',
+        '--changelog',
+        'A change.'
+      ]);
+
+      final String newChangelog = package.changelogFile.readAsStringSync();
+      const String expectedChangeLog = '''
+## NEXT
+
+* A change.
+
+$originalChangelog''';
+
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('  Added a NEXT section.'),
+        ]),
+      );
+      expect(newChangelog, expectedChangeLog);
+    });
+
+    test('adds to existing NEXT section', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      const String originalChangelog = '''
+## NEXT
+
+* Already-pending changes.
+
+## 1.0.0
+
+* Old changes.
+''';
+      package.changelogFile.writeAsStringSync(originalChangelog);
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=next',
+        '--changelog',
+        'A change.'
+      ]);
+
+      final String newChangelog = package.changelogFile.readAsStringSync();
+      const String expectedChangeLog = '''
+## NEXT
+
+* A change.
+* Already-pending changes.
+
+## 1.0.0
+
+* Old changes.
+''';
+
+      expect(output,
+          containsAllInOrder(<Matcher>[contains('  Updated NEXT section.')]));
+      expect(newChangelog, expectedChangeLog);
+    });
+
+    test('adds new version section', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      const String originalChangelog = '''
+## 1.0.0
+
+* Previous changes.
+''';
+      package.changelogFile.writeAsStringSync(originalChangelog);
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=bugfix',
+        '--changelog',
+        'A change.'
+      ]);
+
+      final String newChangelog = package.changelogFile.readAsStringSync();
+      const String expectedChangeLog = '''
+## 1.0.1
+
+* A change.
+
+$originalChangelog''';
+
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('  Added a 1.0.1 section.'),
+        ]),
+      );
+      expect(newChangelog, expectedChangeLog);
+    });
+
+    test('converts existing NEXT section to version section', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      const String originalChangelog = '''
+## NEXT
+
+* Already-pending changes.
+
+## 1.0.0
+
+* Old changes.
+''';
+      package.changelogFile.writeAsStringSync(originalChangelog);
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=bugfix',
+        '--changelog',
+        'A change.'
+      ]);
+
+      final String newChangelog = package.changelogFile.readAsStringSync();
+      const String expectedChangeLog = '''
+## 1.0.1
+
+* A change.
+* Already-pending changes.
+
+## 1.0.0
+
+* Old changes.
+''';
+
+      expect(output,
+          containsAllInOrder(<Matcher>[contains('  Updated NEXT section.')]));
+      expect(newChangelog, expectedChangeLog);
+    });
+
+    test('treats multiple lines as multiple list items', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      const String originalChangelog = '''
+## 1.0.0
+
+* Previous changes.
+''';
+      package.changelogFile.writeAsStringSync(originalChangelog);
+
+      await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=bugfix',
+        '--changelog',
+        'First change.\nSecond change.'
+      ]);
+
+      final String newChangelog = package.changelogFile.readAsStringSync();
+      const String expectedChangeLog = '''
+## 1.0.1
+
+* First change.
+* Second change.
+
+$originalChangelog''';
+
+      expect(newChangelog, expectedChangeLog);
+    });
+
+    test('adds a period to any lines missing it, and removes whitespace',
+        () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      const String originalChangelog = '''
+## 1.0.0
+
+* Previous changes.
+''';
+      package.changelogFile.writeAsStringSync(originalChangelog);
+
+      await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=bugfix',
+        '--changelog',
+        'First change  \nSecond change'
+      ]);
+
+      final String newChangelog = package.changelogFile.readAsStringSync();
+      const String expectedChangeLog = '''
+## 1.0.1
+
+* First change.
+* Second change.
+
+$originalChangelog''';
+
+      expect(newChangelog, expectedChangeLog);
+    });
+
+    test('handles non-standard changelog format', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      const String originalChangelog = '''
+# 1.0.0
+
+* A version with the wrong heading format.
+''';
+      package.changelogFile.writeAsStringSync(originalChangelog);
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=next',
+        '--changelog',
+        'A change.'
+      ]);
+
+      final String newChangelog = package.changelogFile.readAsStringSync();
+      const String expectedChangeLog = '''
+## NEXT
+
+* A change.
+
+$originalChangelog''';
+
+      expect(output,
+          containsAllInOrder(<Matcher>[contains('  Added a NEXT section.')]));
+      expect(newChangelog, expectedChangeLog);
+    });
+
+    test('adds to existing NEXT section using - list style', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      const String originalChangelog = '''
+## NEXT
+
+ - Already-pending changes.
+
+## 1.0.0
+
+ - Previous changes.
+''';
+      package.changelogFile.writeAsStringSync(originalChangelog);
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=next',
+        '--changelog',
+        'A change.'
+      ]);
+
+      final String newChangelog = package.changelogFile.readAsStringSync();
+      const String expectedChangeLog = '''
+## NEXT
+
+ - A change.
+ - Already-pending changes.
+
+## 1.0.0
+
+ - Previous changes.
+''';
+
+      expect(output,
+          containsAllInOrder(<Matcher>[contains('  Updated NEXT section.')]));
+      expect(newChangelog, expectedChangeLog);
+    });
+
+    test('skips for "minimal" when there are no changes at all', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.1');
+      processRunner.mockProcessesForExecutable['git-diff'] = <io.Process>[
+        MockProcess(stdout: '''
+packages/different_package/test/plugin_test.dart
+'''),
+      ];
+      final String originalChangelog = package.changelogFile.readAsStringSync();
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=minimal',
+        '--changelog',
+        'A change.',
+      ]);
+
+      final String version = package.parsePubspec().version?.toString() ?? '';
+      expect(version, '1.0.1');
+      expect(package.changelogFile.readAsStringSync(), originalChangelog);
+      expect(
+          output,
+          containsAllInOrder(<Matcher>[
+            contains('No changes to package'),
+            contains('Skipped 1 package')
+          ]));
+    });
+
+    test('fails if CHANGELOG.md is missing', () async {
+      createFakePackage('a_package', packagesDir, includeCommonFiles: false);
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=minor',
+        '--changelog',
+        'A change.',
+      ], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(output,
+          containsAllInOrder(<Matcher>[contains('  Missing CHANGELOG.md.')]));
+    });
+
+    test('fails if CHANGELOG.md has unexpected NEXT block format', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      const String originalChangelog = '''
+## NEXT
+
+Some free-form text that isn't a list.
+
+## 1.0.0
+
+- Previous changes.
+''';
+      package.changelogFile.writeAsStringSync(originalChangelog);
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=minor',
+        '--changelog',
+        'A change.',
+      ], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+          output,
+          containsAllInOrder(<Matcher>[
+            contains('  Existing NEXT section has unrecognized format.')
+          ]));
+    });
+  });
+
+  group('pubspec', () {
+    test('does not change for --next', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.0');
+
+      await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=next',
+        '--changelog',
+        'A change.'
+      ]);
+
+      final String version = package.parsePubspec().version?.toString() ?? '';
+      expect(version, '1.0.0');
+    });
+
+    test('updates bugfix version for pre-1.0 without existing build number',
+        () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '0.1.0');
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=bugfix',
+        '--changelog',
+        'A change.',
+      ]);
+
+      final String version = package.parsePubspec().version?.toString() ?? '';
+      expect(version, '0.1.0+1');
+      expect(
+          output,
+          containsAllInOrder(
+              <Matcher>[contains('  Incremented version to 0.1.0+1')]));
+    });
+
+    test('updates bugfix version for pre-1.0 with existing build number',
+        () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '0.1.0+2');
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=bugfix',
+        '--changelog',
+        'A change.',
+      ]);
+
+      final String version = package.parsePubspec().version?.toString() ?? '';
+      expect(version, '0.1.0+3');
+      expect(
+          output,
+          containsAllInOrder(
+              <Matcher>[contains('  Incremented version to 0.1.0+3')]));
+    });
+
+    test('updates bugfix version for post-1.0', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.1');
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=bugfix',
+        '--changelog',
+        'A change.',
+      ]);
+
+      final String version = package.parsePubspec().version?.toString() ?? '';
+      expect(version, '1.0.2');
+      expect(
+          output,
+          containsAllInOrder(
+              <Matcher>[contains('  Incremented version to 1.0.2')]));
+    });
+
+    test('updates minor version for pre-1.0', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '0.1.0+2');
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=minor',
+        '--changelog',
+        'A change.',
+      ]);
+
+      final String version = package.parsePubspec().version?.toString() ?? '';
+      expect(version, '0.1.1');
+      expect(
+          output,
+          containsAllInOrder(
+              <Matcher>[contains('  Incremented version to 0.1.1')]));
+    });
+
+    test('updates minor version for post-1.0', () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.1');
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=minor',
+        '--changelog',
+        'A change.',
+      ]);
+
+      final String version = package.parsePubspec().version?.toString() ?? '';
+      expect(version, '1.1.0');
+      expect(
+          output,
+          containsAllInOrder(
+              <Matcher>[contains('  Incremented version to 1.1.0')]));
+    });
+
+    test('updates bugfix version for "minimal" with publish-worthy changes',
+        () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.1');
+      processRunner.mockProcessesForExecutable['git-diff'] = <io.Process>[
+        MockProcess(stdout: '''
+packages/a_package/lib/plugin.dart
+'''),
+      ];
+
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=minimal',
+        '--changelog',
+        'A change.',
+      ]);
+
+      final String version = package.parsePubspec().version?.toString() ?? '';
+      expect(version, '1.0.2');
+      expect(
+          output,
+          containsAllInOrder(
+              <Matcher>[contains('  Incremented version to 1.0.2')]));
+    });
+
+    test('no version change for "minimal" with non-publish-worthy changes',
+        () async {
+      final RepositoryPackage package =
+          createFakePackage('a_package', packagesDir, version: '1.0.1');
+      processRunner.mockProcessesForExecutable['git-diff'] = <io.Process>[
+        MockProcess(stdout: '''
+packages/a_package/test/plugin_test.dart
+'''),
+      ];
+
+      await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=minimal',
+        '--changelog',
+        'A change.',
+      ]);
+
+      final String version = package.parsePubspec().version?.toString() ?? '';
+      expect(version, '1.0.1');
+    });
+
+    test('fails if there is no version in pubspec', () async {
+      createFakePackage('a_package', packagesDir, version: null);
+
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(runner, <String>[
+        'update-release-info',
+        '--version=minor',
+        '--changelog',
+        'A change.',
+      ], errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+          output,
+          containsAllInOrder(
+              <Matcher>[contains('Could not determine current version.')]));
+    });
+  });
+}
diff --git a/script/tool/test/util.dart b/script/tool/test/util.dart
index 7255bf9a9276..4c99873e937d 100644
--- a/script/tool/test/util.dart
+++ b/script/tool/test/util.dart
@@ -310,14 +310,15 @@ String _pluginPlatformSection(
   return entry;
 }
 
-typedef ErrorHandler = void Function(Error error);
-
 /// Run the command [runner] with the given [args] and return
 /// what was printed.
 /// A custom [errorHandler] can be used to handle the runner error as desired without throwing.
 Future<List<String>> runCapturingPrint(
-    CommandRunner<void> runner, List<String> args,
-    {ErrorHandler? errorHandler}) async {
+  CommandRunner<void> runner,
+  List<String> args, {
+  Function(Error error)? errorHandler,
+  Function(Exception error)? exceptionHandler,
+}) async {
   final List<String> prints = <String>[];
   final ZoneSpecification spec = ZoneSpecification(
     print: (_, __, ___, String message) {
@@ -333,6 +334,11 @@ Future<List<String>> runCapturingPrint(
       rethrow;
     }
     errorHandler(e);
+  } on Exception catch (e) {
+    if (exceptionHandler == null) {
+      rethrow;
+    }
+    exceptionHandler(e);
   }
 
   return prints;