diff --git a/README.md b/README.md
index d649af73e..24e3445fc 100644
--- a/README.md
+++ b/README.md
@@ -201,8 +201,9 @@ ncu "/^(?!react-).*$/" # windows
 --packageData <value>      Package file data (you can also use stdin).
 --packageFile <path|glob>  Package file(s) location. (default:
                            ./package.json)
--p, --packageManager <s>   npm, yarn, pnpm, staticRegistry (default: npm).
-                           Run "ncu --help --packageManager" for details.
+-p, --packageManager <s>   npm, yarn, pnpm, deno, staticRegistry (default:
+                           npm). Run "ncu --help --packageManager" for
+                           details.
 --peer                     Check peer dependencies of installed packages and
                            filter updates to compatible versions. Run "ncu
                            --help --peer" for details.
diff --git a/package.json b/package.json
index a3fe21279..be3da6267 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "prepare": "husky install",
     "prepublishOnly": "npm run build",
     "prettier": "prettier .",
-    "test": "mocha test test/package-managers/npm test/package-managers/yarn test/package-managers/staticRegistry",
+    "test": "mocha test test/package-managers/*",
     "test:cov": "npm run c8 npm run test",
     "ncu": "node build/src/bin/cli.js"
   },
diff --git a/src/cli-options.ts b/src/cli-options.ts
index d3ab7c44e..ce426c58f 100755
--- a/src/cli-options.ts
+++ b/src/cli-options.ts
@@ -517,9 +517,9 @@ const cliOptions: CLIOption[] = [
     long: 'packageManager',
     short: 'p',
     arg: 's',
-    description: 'npm, yarn, pnpm, staticRegistry (default: npm).',
+    description: 'npm, yarn, pnpm, deno, staticRegistry (default: npm).',
     help: extendedHelpPackageManager,
-    type: `'npm' | 'yarn' | 'pnpm' | 'staticRegistry'`,
+    type: `'npm' | 'yarn' | 'pnpm' | 'deno' | 'staticRegistry'`,
   },
   {
     long: 'peer',
diff --git a/src/lib/determinePackageManager.ts b/src/lib/determinePackageManager.ts
index 3a88cab44..fa35a1a2a 100644
--- a/src/lib/determinePackageManager.ts
+++ b/src/lib/determinePackageManager.ts
@@ -9,6 +9,7 @@ const packageManagerLockfileMap: Index<PackageManagerName> = {
   'package-lock': 'npm',
   yarn: 'yarn',
   'pnpm-lock': 'pnpm',
+  deno: 'deno',
 }
 
 /**
diff --git a/src/lib/findLockfile.ts b/src/lib/findLockfile.ts
index 666832f00..429533c23 100644
--- a/src/lib/findLockfile.ts
+++ b/src/lib/findLockfile.ts
@@ -29,6 +29,8 @@ export default async function findLockfile(
         return { directoryPath: currentPath, filename: 'yarn.lock' }
       } else if (files.includes('pnpm-lock.yaml')) {
         return { directoryPath: currentPath, filename: 'pnpm-lock.yaml' }
+      } else if (files.includes('deno.json')) {
+        return { directoryPath: currentPath, filename: 'deno.json' }
       }
 
       const pathParent = path.resolve(currentPath, '..')
diff --git a/src/lib/findPackage.ts b/src/lib/findPackage.ts
index 33b14c65b..f2b17c628 100644
--- a/src/lib/findPackage.ts
+++ b/src/lib/findPackage.ts
@@ -42,7 +42,9 @@ async function findPackage(options: Options) {
       )
     }
 
-    return fs.readFile(pkgFile!, 'utf-8')
+    return fs.readFile(pkgFile!, 'utf-8').catch(e => {
+      programError(options, chalk.red(e))
+    })
   }
 
   print(options, 'Running in local mode', 'verbose')
diff --git a/src/lib/getCurrentDependencies.ts b/src/lib/getCurrentDependencies.ts
index 7107c0976..5b57892f1 100644
--- a/src/lib/getCurrentDependencies.ts
+++ b/src/lib/getCurrentDependencies.ts
@@ -6,6 +6,7 @@ import { VersionSpec } from '../types/VersionSpec'
 import filterAndReject from './filterAndReject'
 import filterObject from './filterObject'
 import { keyValueBy } from './keyValueBy'
+import resolveDepSections from './resolveDepSections'
 
 /** Returns true if spec1 is greater than spec2, ignoring invalid version ranges. */
 const isGreaterThanSafe = (spec1: VersionSpec, spec2: VersionSpec) =>
@@ -32,21 +33,7 @@ const parsePackageManager = (pkgData: PackageFile) => {
  * @returns Promised {packageName: version} collection
  */
 function getCurrentDependencies(pkgData: PackageFile = {}, options: Options = {}) {
-  const depOptions = options.dep
-    ? typeof options.dep === 'string'
-      ? options.dep.split(',')
-      : options.dep
-    : ['prod', 'dev', 'optional']
-
-  // map the dependency section option to a full dependency section name
-  const depSections = depOptions.map(
-    short =>
-      (short === 'prod'
-        ? 'dependencies'
-        : short === 'packageManager'
-        ? short
-        : short + 'Dependencies') as keyof PackageFile,
-  )
+  const depSections = resolveDepSections(options.dep)
 
   // get all dependencies from the selected sections
   // if a dependency appears in more than one section, take the lowest version number
diff --git a/src/lib/getPackageManager.ts b/src/lib/getPackageManager.ts
index 98ca28bb8..ced354a7d 100644
--- a/src/lib/getPackageManager.ts
+++ b/src/lib/getPackageManager.ts
@@ -12,7 +12,7 @@ import { PackageManager } from '../types/PackageManager'
  */
 function getPackageManager(name: Maybe<string>): PackageManager {
   // default to npm
-  if (!name) {
+  if (!name || name === 'deno') {
     return packageManagers.npm
   }
 
diff --git a/src/lib/initOptions.ts b/src/lib/initOptions.ts
index c5755caf9..cf9214d40 100644
--- a/src/lib/initOptions.ts
+++ b/src/lib/initOptions.ts
@@ -1,6 +1,6 @@
 import isEqual from 'lodash/isEqual'
 import propertyOf from 'lodash/propertyOf'
-import cliOptions from '../cli-options'
+import cliOptions, { cliOptionsMap } from '../cli-options'
 import { print } from '../lib/logging'
 import { FilterPattern } from '../types/FilterPattern'
 import { Options } from '../types/Options'
@@ -156,14 +156,14 @@ async function initOptions(runOptions: RunOptions, { cli }: { cli?: boolean } =
 
   const packageManager = await determinePackageManager(options)
 
-  // print 'Using yarn/pnpm/etc' when autodetected
-  if (!options.packageManager && packageManager !== 'npm') {
-    print(options, `Using ${packageManager}`)
-  }
-
   const resolvedOptions: Options = {
     ...options,
-    ...(options.deep ? { packageFile: '**/package.json' } : null),
+    ...(options.deep
+      ? { packageFile: '**/package.json' }
+      : packageManager === 'deno' && !options.packageFile
+      ? { packageFile: 'deno.json' }
+      : null),
+    ...(packageManager === 'deno' && options.dep !== cliOptionsMap.dep.default ? { dep: ['imports'] } : null),
     ...(options.format && options.format.length > 0 ? { format: options.format } : null),
     filter: args || filter,
     // add shortcut for any keys that start with 'json'
@@ -180,6 +180,12 @@ async function initOptions(runOptions: RunOptions, { cli }: { cli?: boolean } =
   }
   resolvedOptions.cacher = await cacher(resolvedOptions)
 
+  // print 'Using yarn/pnpm/etc' when autodetected
+  // use resolved options so that options.json is set
+  if (!options.packageManager && packageManager !== 'npm') {
+    print(resolvedOptions, `Using ${packageManager}`)
+  }
+
   return resolvedOptions
 }
 
diff --git a/src/lib/resolveDepSections.ts b/src/lib/resolveDepSections.ts
new file mode 100644
index 000000000..6076918a2
--- /dev/null
+++ b/src/lib/resolveDepSections.ts
@@ -0,0 +1,24 @@
+import { cliOptionsMap } from '../cli-options'
+import { Index } from '../types/IndexType'
+import { PackageFile } from '../types/PackageFile'
+
+// dependency section aliases that will be resolved to the full name
+const depAliases: Index<keyof PackageFile> = {
+  dev: 'devDependencies',
+  peer: 'peerDependencies',
+  prod: 'dependencies',
+  optional: 'optionalDependencies',
+}
+
+/** Gets a list of dependency sections based on options.dep. */
+const resolveDepSections = (dep?: string | string[]): (keyof PackageFile)[] => {
+  // parse dep string and set default
+  const depOptions: string[] = dep ? (typeof dep === 'string' ? dep.split(',') : dep) : cliOptionsMap.dep.default
+
+  // map the dependency section option to a full dependency section name
+  const depSections = depOptions.map(name => depAliases[name] || name)
+
+  return depSections
+}
+
+export default resolveDepSections
diff --git a/src/lib/runLocal.ts b/src/lib/runLocal.ts
index 5427d5d39..fa1f0541a 100644
--- a/src/lib/runLocal.ts
+++ b/src/lib/runLocal.ts
@@ -20,6 +20,7 @@ import getPeerDependencies from './getPeerDependencies'
 import keyValueBy from './keyValueBy'
 import { print, printIgnoredUpdates, printJson, printUpgrades, toDependencyTable } from './logging'
 import programError from './programError'
+import resolveDepSections from './resolveDepSections'
 import upgradePackageData from './upgradePackageData'
 import upgradePackageDefinitions from './upgradePackageDefinitions'
 import { getDependencyGroups } from './version-util'
@@ -255,7 +256,7 @@ async function runLocal(
   const output = options.jsonAll
     ? (jph.parse(newPkgData) as PackageFile)
     : options.jsonDeps
-    ? pick(jph.parse(newPkgData) as PackageFile, 'dependencies', 'devDependencies', 'optionalDependencies')
+    ? pick(jph.parse(newPkgData) as PackageFile, resolveDepSections(options.dep))
     : chosenUpgraded
 
   // will be overwritten with the result of fs.writeFile so that the return promise waits for the package file to be written
diff --git a/src/lib/upgradePackageData.ts b/src/lib/upgradePackageData.ts
index 914090c08..ba084a186 100644
--- a/src/lib/upgradePackageData.ts
+++ b/src/lib/upgradePackageData.ts
@@ -2,6 +2,7 @@ import { Index } from '../types/IndexType'
 import { Options } from '../types/Options'
 import { PackageFile } from '../types/PackageFile'
 import { VersionSpec } from '../types/VersionSpec'
+import resolveDepSections from './resolveDepSections'
 
 /**
  * @returns String safe for use in `new RegExp()`
@@ -25,21 +26,7 @@ async function upgradePackageData(
   upgraded: Index<VersionSpec>,
   options: Options,
 ) {
-  const depOptions = options.dep
-    ? typeof options.dep === 'string'
-      ? options.dep.split(',')
-      : options.dep
-    : ['prod', 'dev', 'optional']
-
-  // map the dependency section option to a full dependency section name
-  const depSections = depOptions.map(
-    short =>
-      (short === 'prod'
-        ? 'dependencies'
-        : short === 'packageManager'
-        ? short
-        : short + 'Dependencies') as keyof PackageFile,
-  )
+  const depSections = resolveDepSections(options.dep)
 
   // iterate through each dependency section
   const sectionRegExp = new RegExp(`"(${depSections.join(`|`)})"s*:[^}]*`, 'g')
@@ -54,7 +41,7 @@ async function upgradePackageData(
     return section
   })
 
-  if (depOptions.includes('packageManager')) {
+  if (depSections.includes('packageManager')) {
     const pkg = JSON.parse(pkgData) as PackageFile
     if (pkg.packageManager) {
       const [name] = pkg.packageManager.split('@')
diff --git a/src/types/PackageFile.ts b/src/types/PackageFile.ts
index 0d1e6b29e..326bae83e 100644
--- a/src/types/PackageFile.ts
+++ b/src/types/PackageFile.ts
@@ -6,6 +6,8 @@ import { VersionSpec } from './VersionSpec'
 export interface PackageFile {
   dependencies?: Index<VersionSpec>
   devDependencies?: Index<VersionSpec>
+  // deno only
+  imports?: Index<VersionSpec>
   engines?: Index<VersionSpec>
   name?: string
   // https://nodejs.org/api/packages.html#packagemanager
diff --git a/src/types/PackageManagerName.ts b/src/types/PackageManagerName.ts
index 20fad76b7..cdd7e5401 100644
--- a/src/types/PackageManagerName.ts
+++ b/src/types/PackageManagerName.ts
@@ -1,2 +1,2 @@
 /** A valid package manager. */
-export type PackageManagerName = 'npm' | 'yarn' | 'pnpm' | 'staticRegistry'
+export type PackageManagerName = 'npm' | 'yarn' | 'pnpm' | 'deno' | 'staticRegistry'
diff --git a/src/types/RunOptions.ts b/src/types/RunOptions.ts
index 9dd03d4ae..e87a21d9e 100644
--- a/src/types/RunOptions.ts
+++ b/src/types/RunOptions.ts
@@ -99,8 +99,8 @@ export interface RunOptions {
   /** Package file(s) location. (default: ./package.json) */
   packageFile?: string
 
-  /** npm, yarn, pnpm, staticRegistry (default: npm). Run "ncu --help --packageManager" for details. */
-  packageManager?: 'npm' | 'yarn' | 'pnpm' | 'staticRegistry'
+  /** npm, yarn, pnpm, deno, staticRegistry (default: npm). Run "ncu --help --packageManager" for details. */
+  packageManager?: 'npm' | 'yarn' | 'pnpm' | 'deno' | 'staticRegistry'
 
   /** Check peer dependencies of installed packages and filter updates to compatible versions. Run "ncu --help --peer" for details. */
   peer?: boolean
diff --git a/test/package-managers/deno/index.test.ts b/test/package-managers/deno/index.test.ts
new file mode 100644
index 000000000..429ae68fc
--- /dev/null
+++ b/test/package-managers/deno/index.test.ts
@@ -0,0 +1,60 @@
+import chai from 'chai'
+import chaiAsPromised from 'chai-as-promised'
+import chaiString from 'chai-string'
+import fs from 'fs/promises'
+import jph from 'json-parse-helpfulerror'
+import os from 'os'
+import path from 'path'
+import spawn from 'spawn-please'
+
+chai.should()
+chai.use(chaiAsPromised)
+chai.use(chaiString)
+
+process.env.NCU_TESTS = 'true'
+
+const bin = path.join(__dirname, '../../../build/src/bin/cli.js')
+
+describe('deno', async function () {
+  it('handle import map', async () => {
+    const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'npm-check-updates-'))
+    const pkgFile = path.join(tempDir, 'deno.json')
+    const pkg = {
+      imports: {
+        'ncu-test-v2': 'npm:ncu-test-v2@1.0.0',
+      },
+    }
+    await fs.writeFile(pkgFile, JSON.stringify(pkg), 'utf-8')
+    try {
+      const pkgData = await spawn(
+        'node',
+        [bin, '--jsonUpgraded', '--verbose', '--packageManager', 'deno', '--packageFile', pkgFile],
+        undefined,
+      )
+      const pkg = jph.parse(pkgData)
+      pkg.should.have.property('ncu-test-v2')
+    } finally {
+      await fs.rm(tempDir, { recursive: true, force: true })
+    }
+  })
+
+  it('auto detect deno.json', async () => {
+    const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'npm-check-updates-'))
+    const pkgFile = path.join(tempDir, 'deno.json')
+    const pkg = {
+      imports: {
+        'ncu-test-v2': 'npm:ncu-test-v2@1.0.0',
+      },
+    }
+    await fs.writeFile(pkgFile, JSON.stringify(pkg), 'utf-8')
+    try {
+      const pkgData = await spawn('node', [bin, '--jsonUpgraded', '--verbose'], undefined, {
+        cwd: tempDir,
+      })
+      const pkg = jph.parse(pkgData)
+      pkg.should.have.property('ncu-test-v2')
+    } finally {
+      await fs.rm(tempDir, { recursive: true, force: true })
+    }
+  })
+})
diff --git a/test/package-managers/yarn/index.test.ts b/test/package-managers/yarn/index.test.ts
index 2d58f60d8..b594f448f 100644
--- a/test/package-managers/yarn/index.test.ts
+++ b/test/package-managers/yarn/index.test.ts
@@ -94,35 +94,35 @@ describe('yarn', function () {
       should.equal(authToken, null)
     })
   })
-})
 
-describe('getPathToLookForLocalYarnrc', () => {
-  it('returns the correct path when using Yarn workspaces', async () => {
-    /** Mock for filesystem calls. */
-    function readdirMock(path: string): Promise<string[]> {
-      switch (path) {
-        case '/home/test-repo/packages/package-a':
-        case 'C:\\home\\test-repo\\packages\\package-a':
-          return Promise.resolve(['index.ts'])
-        case '/home/test-repo/packages':
-        case 'C:\\home\\test-repo\\packages':
-          return Promise.resolve([])
-        case '/home/test-repo':
-        case 'C:\\home\\test-repo':
-          return Promise.resolve(['yarn.lock'])
+  describe('getPathToLookForLocalYarnrc', () => {
+    it('returns the correct path when using Yarn workspaces', async () => {
+      /** Mock for filesystem calls. */
+      function readdirMock(path: string): Promise<string[]> {
+        switch (path) {
+          case '/home/test-repo/packages/package-a':
+          case 'C:\\home\\test-repo\\packages\\package-a':
+            return Promise.resolve(['index.ts'])
+          case '/home/test-repo/packages':
+          case 'C:\\home\\test-repo\\packages':
+            return Promise.resolve([])
+          case '/home/test-repo':
+          case 'C:\\home\\test-repo':
+            return Promise.resolve(['yarn.lock'])
+        }
+
+        throw new Error(`Mock cannot handle path: ${path}.`)
       }
 
-      throw new Error(`Mock cannot handle path: ${path}.`)
-    }
-
-    const yarnrcPath = await getPathToLookForYarnrc(
-      {
-        cwd: isWindows ? 'C:\\home\\test-repo\\packages\\package-a' : '/home/test-repo/packages/package-a',
-      },
-      readdirMock,
-    )
+      const yarnrcPath = await getPathToLookForYarnrc(
+        {
+          cwd: isWindows ? 'C:\\home\\test-repo\\packages\\package-a' : '/home/test-repo/packages/package-a',
+        },
+        readdirMock,
+      )
 
-    should.exist(yarnrcPath)
-    yarnrcPath!.should.equal(isWindows ? 'C:\\home\\test-repo\\.yarnrc.yml' : '/home/test-repo/.yarnrc.yml')
+      should.exist(yarnrcPath)
+      yarnrcPath!.should.equal(isWindows ? 'C:\\home\\test-repo\\.yarnrc.yml' : '/home/test-repo/.yarnrc.yml')
+    })
   })
 })