diff --git a/README.md b/README.md
index 48484e59..70d24634 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ npx npm-check-updates
 
 ## Usage
 
-Show any new dependencies for the project in the current directory:
+Show all new dependencies ([excluding peerDependencies](https://github.com/raineorshine/npm-check-updates/issues/951)) for the project in the current directory:
 
 ```sh
 $ ncu
@@ -136,7 +136,8 @@ ncu "/^(?!react-).*$/" # windows
                              Alias of (--packageFile '**/package.json').
 --dep <value>                Check one or more sections of dependencies only:
                              dev, optional, peer, prod, bundle
-                             (comma-delimited).
+                             (comma-delimited). (default:
+                             "prod,dev,bundle,optional")
 --deprecated                 Include deprecated packages.
 --doctor                     Iteratively installs upgrades and runs tests to
                              identify breaking upgrades. Run "ncu --doctor"
diff --git a/lib/cli-options.js b/lib/cli-options.js
index 52f432cf..f01998fd 100644
--- a/lib/cli-options.js
+++ b/lib/cli-options.js
@@ -114,7 +114,8 @@ As a comparison: without using the --peer option, ncu will suggest the latest ve
   {
     long: 'dep',
     arg: 'value',
-    description: 'Check one or more sections of dependencies only: dev, optional, peer, prod, bundle (comma-delimited).'
+    description: 'Check one or more sections of dependencies only: dev, optional, peer, prod, bundle (comma-delimited).',
+    default: 'prod,dev,bundle,optional'
   },
   {
     long: 'deprecated',
diff --git a/lib/doctor.js b/lib/doctor.js
index 7aa92809..d18ddb75 100644
--- a/lib/doctor.js
+++ b/lib/doctor.js
@@ -65,7 +65,6 @@ const doctor = async (run, options) => {
     ...pkg.dependencies,
     ...pkg.devDependencies,
     ...pkg.optionalDependencies,
-    ...pkg.peerDependencies,
     ...pkg.bundleDependencies,
   }
 
diff --git a/lib/index.d.ts b/lib/index.d.ts
index dbfc19f9..97f915fc 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -33,7 +33,7 @@ declare namespace ncu {
     deep?: boolean;
 
     /**
-     * Check one or more sections of dependencies only: dev, optional, peer, prod, bundle (comma-delimited).
+     * Check one or more sections of dependencies only: dev, optional, peer, prod, bundle (comma-delimited). (default: "prod,dev,bundle,optional")
      */
     dep?: string;
 
diff --git a/lib/versionmanager.js b/lib/versionmanager.js
index a199cd3a..88620def 100644
--- a/lib/versionmanager.js
+++ b/lib/versionmanager.js
@@ -324,7 +324,9 @@ function getCurrentDependencies(pkgData = {}, options = {}) {
 
   const depOptions = options.dep
     ? (options.dep || '').split(',')
-    : ['dev', 'optional', 'peer', 'prod', 'bundle']
+    // exclude peerDependencies
+    // https://github.com/raineorshine/npm-check-updates/issues/951
+    : ['dev', 'optional', 'prod', 'bundle']
 
   // map the dependency section option to a full dependency section name
   const depSections = depOptions.map(short => short === 'prod' ? 'dependencies' : short + 'Dependencies')
diff --git a/test/index.test.js b/test/index.test.js
index 918c85e2..be81c418 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -64,7 +64,19 @@ describe('run', function () {
     return upgraded.should.eventually.not.have.property('juggernaut')
   })
 
-  it('only upgrade devDependencies and peerDependencies with --dep dev', () => {
+  it('do not upgrade peerDependencies by default', () => {
+    const upgraded = ncu.run({
+      packageData: fs.readFileSync(path.join(__dirname, '/ncu/package-dep.json'), 'utf-8')
+    })
+
+    return Promise.all([
+      upgraded.should.eventually.have.property('express'),
+      upgraded.should.eventually.have.property('chalk'),
+      upgraded.should.eventually.not.have.property('mocha')
+    ])
+  })
+
+  it('only upgrade devDependencies with --dep dev', () => {
     const upgraded = ncu.run({
       packageData: fs.readFileSync(path.join(__dirname, '/ncu/package-dep.json'), 'utf-8'),
       dep: 'dev'
diff --git a/test/versionmanager.test.js b/test/versionmanager.test.js
index 13af04c7..ae3718f7 100644
--- a/test/versionmanager.test.js
+++ b/test/versionmanager.test.js
@@ -114,13 +114,12 @@ describe('versionmanager', () => {
       vm.getCurrentDependencies({}, {}).should.eql({})
     })
 
-    it('get dependencies, devDependencies, and optionalDependencies by default', () => {
+    it('get dependencies, devDependencies, bundleDegendencies, and optionalDependencies by default', () => {
       vm.getCurrentDependencies(deps).should.eql({
         mocha: '1.2',
         lodash: '^3.9.3',
         chalk: '^1.1.0',
         bluebird: '^1.0.0',
-        moment: '^1.0.0'
       })
     })
 
@@ -205,12 +204,10 @@ describe('versionmanager', () => {
         vm.getCurrentDependencies(deps, { filter: /o/ }).should.eql({
           lodash: '^3.9.3',
           mocha: '1.2',
-          moment: '^1.0.0'
         })
         vm.getCurrentDependencies(deps, { filter: '/o/' }).should.eql({
           lodash: '^3.9.3',
           mocha: '1.2',
-          moment: '^1.0.0'
         })
       })
 
@@ -228,7 +225,6 @@ describe('versionmanager', () => {
           mocha: '1.2',
           lodash: '^3.9.3',
           bluebird: '^1.0.0',
-          moment: '^1.0.0'
         })
       })
 
@@ -238,7 +234,6 @@ describe('versionmanager', () => {
           lodash: '^3.9.3',
           chalk: '^1.1.0',
           bluebird: '^1.0.0',
-          moment: '^1.0.0'
         })
       })
 
@@ -246,17 +241,14 @@ describe('versionmanager', () => {
         vm.getCurrentDependencies(deps, { reject: 'mocha lodash' }).should.eql({
           chalk: '^1.1.0',
           bluebird: '^1.0.0',
-          moment: '^1.0.0'
         })
         vm.getCurrentDependencies(deps, { reject: 'mocha,lodash' }).should.eql({
           chalk: '^1.1.0',
           bluebird: '^1.0.0',
-          moment: '^1.0.0'
         })
         vm.getCurrentDependencies(deps, { reject: ['mocha', 'lodash'] }).should.eql({
           chalk: '^1.1.0',
           bluebird: '^1.0.0',
-          moment: '^1.0.0'
         })
       })