diff --git a/src/factory.ts b/src/factory.ts
index ae6f1bf8d..d7f7eab38 100644
--- a/src/factory.ts
+++ b/src/factory.ts
@@ -31,6 +31,8 @@ import {JavaYoshi} from './strategies/java-yoshi';
 import {JavaYoshiMonoRepo} from './strategies/java-yoshi-mono-repo';
 import {KRMBlueprint} from './strategies/krm-blueprint';
 import {Maven} from './strategies/maven';
+import {MediaWikiSkin} from './strategies/mediawiki-skin';
+import {MediaWikiExtension} from './strategies/mediawiki-extension';
 import {Node} from './strategies/node';
 import {OCaml} from './strategies/ocaml';
 import {PHP} from './strategies/php';
@@ -72,6 +74,7 @@ const releasers: Record<string, ReleaseBuilder> = {
   'go-yoshi': options => new GoYoshi(options),
   java: options => new Java(options),
   maven: options => new Maven(options),
+  'mediawiki-skin': options => new MediaWikiSkin(options),
   'java-yoshi': options => new JavaYoshi(options),
   'java-yoshi-mono-repo': options => new JavaYoshiMonoRepo(options),
   'java-backport': options =>
diff --git a/src/strategies/mediawiki-extension.ts b/src/strategies/mediawiki-extension.ts
new file mode 100644
index 000000000..e0b5a4f9b
--- /dev/null
+++ b/src/strategies/mediawiki-extension.ts
@@ -0,0 +1,72 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Generic
+import {Changelog} from '../updaters/changelog';
+// MediaWiki Extension Specific.
+import {MediaWikiExtensionJson} from '../updaters/php/mediawiki-extension-json';
+import {BaseStrategy, BuildUpdatesOptions, BaseStrategyOptions} from './base';
+import {DefaultUpdater} from '../updaters/default';
+import {Update} from '../update';
+import {VersionsMap} from '../version';
+
+const CHANGELOG_SECTIONS = [
+  {type: 'feat', section: 'Features'},
+  {type: 'fix', section: 'Bug Fixes'},
+  {type: 'perf', section: 'Performance Improvements'},
+  {type: 'revert', section: 'Reverts'},
+  {type: 'chore', section: 'Miscellaneous Chores'},
+  {type: 'docs', section: 'Documentation', hidden: true},
+  {type: 'style', section: 'Styles', hidden: true},
+  {type: 'refactor', section: 'Code Refactoring', hidden: true},
+  {type: 'test', section: 'Tests', hidden: true},
+  {type: 'build', section: 'Build System', hidden: true},
+  {type: 'ci', section: 'Continuous Integration', hidden: true},
+];
+
+export class MediaWikiExtension extends BaseStrategy {
+  constructor(options: BaseStrategyOptions) {
+    options.changelogSections = options.changelogSections ?? CHANGELOG_SECTIONS;
+    super(options);
+  }
+
+  protected async buildUpdates(
+    options: BuildUpdatesOptions
+  ): Promise<Update[]> {
+    const updates: Update[] = [];
+    const version = options.newVersion;
+    const versionsMap: VersionsMap = new Map();
+
+    updates.push({
+      path: this.addPath(this.changelogPath),
+      createIfMissing: true,
+      updater: new Changelog({
+        version,
+        changelogEntry: options.changelogEntry,
+      }),
+    });
+
+    // update composer.json
+    updates.push({
+      path: this.addPath('extension.json'),
+      createIfMissing: false,
+      updater: new MediaWikiExtensionJson({
+        version,
+        versionsMap,
+      }),
+    });
+
+    return updates;
+  }
+}
diff --git a/src/strategies/mediawiki-skin.ts b/src/strategies/mediawiki-skin.ts
new file mode 100644
index 000000000..18797fba9
--- /dev/null
+++ b/src/strategies/mediawiki-skin.ts
@@ -0,0 +1,72 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Generic
+import {Changelog} from '../updaters/changelog';
+// MediaWiki Skin Specific.
+import {MediaWikiExtensionJson} from '../updaters/php/mediawiki-extension-json';
+import {BaseStrategy, BuildUpdatesOptions, BaseStrategyOptions} from './base';
+import {DefaultUpdater} from '../updaters/default';
+import {Update} from '../update';
+import {VersionsMap} from '../version';
+
+const CHANGELOG_SECTIONS = [
+  {type: 'feat', section: 'Features'},
+  {type: 'fix', section: 'Bug Fixes'},
+  {type: 'perf', section: 'Performance Improvements'},
+  {type: 'revert', section: 'Reverts'},
+  {type: 'chore', section: 'Miscellaneous Chores'},
+  {type: 'docs', section: 'Documentation', hidden: true},
+  {type: 'style', section: 'Styles', hidden: true},
+  {type: 'refactor', section: 'Code Refactoring', hidden: true},
+  {type: 'test', section: 'Tests', hidden: true},
+  {type: 'build', section: 'Build System', hidden: true},
+  {type: 'ci', section: 'Continuous Integration', hidden: true},
+];
+
+export class MediaWikiSkin extends BaseStrategy {
+  constructor(options: BaseStrategyOptions) {
+    options.changelogSections = options.changelogSections ?? CHANGELOG_SECTIONS;
+    super(options);
+  }
+
+  protected async buildUpdates(
+    options: BuildUpdatesOptions
+  ): Promise<Update[]> {
+    const updates: Update[] = [];
+    const version = options.newVersion;
+    const versionsMap: VersionsMap = new Map();
+
+    updates.push({
+      path: this.addPath(this.changelogPath),
+      createIfMissing: true,
+      updater: new Changelog({
+        version,
+        changelogEntry: options.changelogEntry,
+      }),
+    });
+
+    // update composer.json
+    updates.push({
+      path: this.addPath('skin.json'),
+      createIfMissing: false,
+      updater: new MediaWikiExtensionJson({
+        version,
+        versionsMap,
+      }),
+    });
+
+    return updates;
+  }
+}
diff --git a/src/updaters/php/mediawiki-extension-json.ts b/src/updaters/php/mediawiki-extension-json.ts
new file mode 100644
index 000000000..21fdef772
--- /dev/null
+++ b/src/updaters/php/mediawiki-extension-json.ts
@@ -0,0 +1,58 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import {logger as defaultLogger, Logger} from '../../util/logger';
+import {jsonStringify} from '../../util/json-stringify';
+import {DefaultUpdater} from '../default';
+
+/**
+ * Updates a extension.json
+ */
+export class MediaWikiExtensionJson extends DefaultUpdater {
+  /**
+   * Given initial file contents, return updated contents.
+   * @param {string} content The initial content
+   * @returns {string} The updated content
+   */
+  updateContent(content: string, logger: Logger = defaultLogger): string {
+    if (!this.version && (!this.versionsMap || this.versionsMap.size === 0)) {
+      logger.info('no updates necessary');
+      return content;
+    }
+    const parsed = JSON.parse(content);
+    if (parsed['version']) {
+      const fromVersion: string = parsed['version'];
+      const toVersion = this.version.toString() || '1.0.0';
+      parsed['version'] = toVersion;
+      logger.info(`updating "version" from ${fromVersion} to ${toVersion}`);
+    }
+    if (this.versionsMap) {
+      for (const [key, version] of this.versionsMap.entries()) {
+        const toVersion = version.toString() || '1.0.0';
+        let fromVersion: string | undefined;
+        if (parsed.replace) {
+          fromVersion = parsed.replace[key];
+          parsed.replace[key] = toVersion;
+        }
+        if (parsed[key]) {
+          fromVersion ??= parsed[key];
+          parsed[key] = toVersion;
+        }
+
+        logger.info(`updating ${key} from ${fromVersion} to ${toVersion}`);
+      }
+    }
+    return jsonStringify(parsed, content);
+  }
+}