diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c16c1e..de736dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,12 @@ This changelog format is largely based on [Keep A Changelog](https://keepachange
 
 #### 🔨 Chores & Documentation
 
+## [0.3.0] - 2022-06-27
+
+#### 🚀 New Features & Enhancements
+
+- Add detection and support for Yarn Berry
+
 ## [0.2.0] - 2022-05-16
 
 #### 🚀 New Features & Enhancements
diff --git a/ONE-VERSION.md b/ONE-VERSION.md
index 5b4b2e6..770b40e 100644
--- a/ONE-VERSION.md
+++ b/ONE-VERSION.md
@@ -58,4 +58,4 @@ Although using the same specifier, the entries resolve to two different versions
 
 - This library currently only operates on declared dependencies. That is the `dependencies`, `devDependencies`, and `peerDependencies` specified by a workspace - **not** any transitive dependencies.
 - Resolutions are not yet taken into account.
-- Package manager is selected based on the lockfile name in the root of the repo.
+- Package manager is selected based on the lockfile name in the root of the repo. Berry is chosen over Yarn classic if a `.yarnrc.yml` file exists at the root of the repo.
diff --git a/README.md b/README.md
index 073ca25..8e7832a 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ One Version to bring them all, and in the darkness bind them.<sup>1</sup>
 
 **🚨 Enforcement**: Require all workspaces in a monorepo to conform to the [One-Version rule](#one-version-rule).
 
-**📦 Supports multiple package managers**: Support for `yarn` and `pnpm` workspaces.
+**📦 Supports multiple package managers**: Support for `yarn` classic, `yarn` berry, and `pnpm` workspaces.
 
 **💥 Coordinated upgrades**: Coming Soon!
 
diff --git a/package.json b/package.json
index 2a6a66b..9b3d20c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@wayfair/one-version",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "description": "Opinionated Monorepo Dependency Management CLI",
   "bin": "src/index.js",
   "main": "src/index.js",
diff --git a/src/check.js b/src/check.js
index 5ac1e83..6c6ab91 100644
--- a/src/check.js
+++ b/src/check.js
@@ -5,7 +5,7 @@ Note: Currently enforces the specifications match exactly, i.e. `^17` != `17`.
 const chalk = require("chalk");
 const { parseConfig, detectPackageManager } = require("./shared/util");
 const { format } = require("./format-output");
-const { checkYarn } = require("./yarn/check");
+const { checkYarn, checkBerry } = require("./yarn/check");
 const { checkPnpm } = require("./pnpm/check");
 const {
   UNABLE_TO_DETECT_PACKAGE_MANAGER_ERROR,
@@ -16,6 +16,7 @@ const {
 const PACKAGE_MANGER_API = {
   pnpm: checkPnpm,
   yarn: checkYarn,
+  berry: checkBerry,
 };
 
 const getCheckPackageApi = (packageManager) => {
diff --git a/src/shared/__tests__/util.test.js b/src/shared/__tests__/util.test.js
index 08ecb6d..df39c82 100644
--- a/src/shared/__tests__/util.test.js
+++ b/src/shared/__tests__/util.test.js
@@ -6,8 +6,8 @@ const {
 } = require("../util");
 const fs = require("fs");
 
-jest.mock('fs', () => ({
-  ...jest.requireActual('fs'),
+jest.mock("fs", () => ({
+  ...jest.requireActual("fs"),
   existsSync: jest.fn(),
 }));
 
@@ -127,20 +127,30 @@ describe("findDuplicateDependencies", () => {
   });
 
   it("returns pnpm if pnpm-lock.yml exists", () => {
-    fs.existsSync.mockReturnValueOnce(true);
-    const packageManager = detectPackageManager({pnpm: "pnpm-lock.yaml",});
-    expect(packageManager).toBe('pnpm');
+    // first check for yarn.lock, then pnpm
+    fs.existsSync.mockReturnValueOnce(false).mockReturnValueOnce(true);
+    const packageManager = detectPackageManager();
+    expect(packageManager).toBe("pnpm");
   });
 
-  it("returns pnpm if yarn.lock exists", () => {
-    fs.existsSync.mockReturnValueOnce(true);
-    const packageManager = detectPackageManager({yarn: "yarn.lock"});
-    expect(packageManager).toBe('yarn');
+  it("returns yarn if yarn.lock exists", () => {
+    // first check for yarn.lock, then yarnrc
+    fs.existsSync.mockReturnValueOnce(true).mockReturnValueOnce(false);
+    const packageManager = detectPackageManager();
+    expect(packageManager).toBe("yarn");
+  });
+
+  it("returns berry if yarn.lock and .yarnrc.yml exist", () => {
+    // first check for yarn.lock, then yarnrc
+    fs.existsSync.mockReturnValueOnce(true).mockReturnValueOnce(true);
+    const packageManager = detectPackageManager();
+    expect(packageManager).toBe("berry");
   });
 
   it("returns empty if package manager is not detected", () => {
-    fs.existsSync.mockReturnValueOnce(true);
-    const packageManager = detectPackageManager({});
-    expect(packageManager).toBe('');
+    // first check for yarn.lock, then pnpm
+    fs.existsSync.mockReturnValueOnce(false).mockReturnValueOnce(false);
+    const packageManager = detectPackageManager();
+    expect(packageManager).toBe("");
   });
 });
diff --git a/src/shared/constants.js b/src/shared/constants.js
index 1cb4b08..24c2616 100644
--- a/src/shared/constants.js
+++ b/src/shared/constants.js
@@ -1,9 +1,8 @@
 const CONFIG_FILE = "oneversion.config.json";
 
-const LOCKFILES = {
-  yarn: "yarn.lock",
-  pnpm: "pnpm-lock.yaml",
-};
+const YARN_LOCK = "yarn.lock";
+const PNPM_LOCK = "pnpm-lock.yaml";
+const YARN_RC = ".yarnrc.yml";
 
 const DEPENDENCY_TYPES = {
   DIRECT: "direct",
@@ -19,9 +18,11 @@ const NO_CHECK_API_ERROR = `'check' api not supported for package manager:`;
 
 module.exports = {
   CONFIG_FILE,
-  LOCKFILES,
   DEPENDENCY_TYPES,
   UNABLE_TO_DETECT_PACKAGE_MANAGER_ERROR,
   FAILED_CHECK_ERROR,
   NO_CHECK_API_ERROR,
+  YARN_LOCK,
+  PNPM_LOCK,
+  YARN_RC,
 };
diff --git a/src/shared/util.js b/src/shared/util.js
index 94e3541..5c5673c 100644
--- a/src/shared/util.js
+++ b/src/shared/util.js
@@ -1,6 +1,12 @@
 const { readFileSync, existsSync } = require("fs");
 const path = require("path");
-const { DEPENDENCY_TYPES, CONFIG_FILE, LOCKFILES } = require("./constants");
+const {
+  DEPENDENCY_TYPES,
+  CONFIG_FILE,
+  YARN_RC,
+  YARN_LOCK,
+  PNPM_LOCK,
+} = require("./constants");
 
 /**
  * Parse a config file if it exists
@@ -158,11 +164,15 @@ const findDuplicateDependencies = (dependencies, overrides) => {
 /**
  * Detect the package manager being used by the project
  */
-const detectPackageManager = (lockfiles = LOCKFILES) => {
-  for (const [packageManager, lockfile] of Object.entries(lockfiles)) {
-    if (existsSync(lockfile)) {
-      return packageManager;
+const detectPackageManager = () => {
+  if (existsSync(YARN_LOCK)) {
+    if (existsSync(YARN_RC)) {
+      return "berry";
     }
+    return "yarn";
+  }
+  if (existsSync(PNPM_LOCK)) {
+    return "pnpm";
   }
   return "";
 };
diff --git a/src/yarn/berry-api.js b/src/yarn/berry-api.js
new file mode 100644
index 0000000..fc88c84
--- /dev/null
+++ b/src/yarn/berry-api.js
@@ -0,0 +1,24 @@
+const { execSync } = require("child_process");
+
+const getWorkspaces = () => {
+  // http://ndjson.org/
+  const ndJSONWorkspaces = execSync("yarn workspaces list --json", {
+    stdio: "pipe",
+  }).toString();
+
+  const workspaces = ndJSONWorkspaces
+    .replace(/\n*$/, "") // strip out trailing new line
+    .split("\n") // split on new line
+    .map((str) => JSON.parse(str)); // parse each workspace
+
+  return workspaces.map(({ location, name }) => ({
+    name,
+    path: location,
+  }));
+};
+
+const berryApi = {
+  getWorkspaces,
+};
+
+module.exports = berryApi;
diff --git a/src/yarn/check.js b/src/yarn/check.js
index 3a39e5e..5a8ef54 100644
--- a/src/yarn/check.js
+++ b/src/yarn/check.js
@@ -3,11 +3,26 @@ const {
   findDuplicateDependencies,
   transformDependencies,
 } = require("../shared/util");
-const { getWorkspaces } = require("./get-workspaces");
+const classicApi = require("./classic-api");
+const berryApi = require("./berry-api");
 
-const checkYarn = ({ overrides, getPackageRoots = getWorkspaces }) => {
+const checkYarn = ({
+  overrides,
+  getPackageRoots = classicApi.getWorkspaces,
+}) => {
   const workspaces = getPackageRoots();
+  return _baseYarnCheck({ workspaces, overrides });
+};
+
+const checkBerry = ({
+  overrides,
+  getPackageRoots = berryApi.getWorkspaces,
+}) => {
+  const workspaces = getPackageRoots();
+  return _baseYarnCheck({ workspaces, overrides });
+};
 
+const _baseYarnCheck = ({ workspaces, overrides }) => {
   const packageDeps = workspaces.map(({ path }) => getPackageDeps(path));
 
   const dependenciesByNameAndVersion = transformDependencies(packageDeps);
@@ -19,4 +34,4 @@ const checkYarn = ({ overrides, getPackageRoots = getWorkspaces }) => {
   return { duplicateDependencies };
 };
 
-module.exports = { checkYarn };
+module.exports = { checkYarn, checkBerry };
diff --git a/src/yarn/get-workspaces.js b/src/yarn/classic-api.js
similarity index 100%
rename from src/yarn/get-workspaces.js
rename to src/yarn/classic-api.js