diff --git a/lib/context.js b/lib/context.js
index 1b73ef3..59d8a5e 100644
--- a/lib/context.js
+++ b/lib/context.js
@@ -11,6 +11,17 @@ exports.getLocalPackageJSON = async function getLocalPackageJSON () {
   return JSON.parse(pkg)
 }
 
+/*
+The check should search both the dev and peer dependencies to find out if the dependency is
+regular, dev or peer.
+ */
 exports.checkPackageInPackageJSON = function checkPackageInPackageJSON (dep, packageJSON) {
-  return Object.prototype.hasOwnProperty.call(packageJSON.dependencies, dep)
+  const dependencyKeyNames = [
+    'dependencies',
+    'devDependencies',
+    'peerDependencies',
+    'optionalDependencies'
+  ]
+  const checkKeyHasDep = (key) => Object.prototype.hasOwnProperty.call(packageJSON, key) && Object.prototype.hasOwnProperty.call(packageJSON[key], dep)
+  return dependencyKeyNames.find(x => checkKeyHasDep(x))
 }
diff --git a/lib/test.js b/lib/test.js
index ccf9501..c02861b 100644
--- a/lib/test.js
+++ b/lib/test.js
@@ -47,12 +47,13 @@ const getCommitURL = async function getCommitURL (owner, repo, hash) {
 }
 
 const applyPatch = module.exports.applyPatch =
-function applyPatch (patch, module, packageJSON) {
-  if (!context.checkPackageInPackageJSON(module, packageJSON)) {
+function applyPatch (patch, module, dependentPkgJSON) {
+  const dependencyType = context.checkPackageInPackageJSON(module, dependentPkgJSON)
+  if (!dependencyType) {
     throw new Error('Dependency not found in package.json')
   }
-  packageJSON.dependencies[module] = patch
-  return packageJSON
+  dependentPkgJSON[dependencyType][module] = patch
+  return dependentPkgJSON
 }
 
 async function pushPatch (packageJSON, owner, repo, dep) {
diff --git a/test/fixtures/config.js b/test/fixtures/config.js
index 18275b2..0698607 100644
--- a/test/fixtures/config.js
+++ b/test/fixtures/config.js
@@ -8,7 +8,29 @@ module.exports.PATCHED_PKGJSON = Object.assign({}, module.exports.PKGJSON, {
     { '@pkgjs/wiby': 'pkgjs/wiby#577c08e8fd5e1b3156ce75b2e5d9e3023dac180e' }
   )
 })
+
+module.exports.PKGJSON_DEV_DEPS = Object.assign({}, module.exports.PKGJSON, {
+  devDependencies: {
+    '@other/name': '*'
+  }
+})
+module.exports.PATCHED_DEV_DEPS_PKGJSON = Object.assign({}, module.exports.PKGJSON, {
+  devDependencies:
+    { '@other/name': 'other/name#577c08e8fd5e1b3156ce75b2e5d9e3023dac180e' }
+})
+
+module.exports.PKGJSON_PEER_DEPS = Object.assign({}, module.exports.PKGJSON, {
+  peerDependencies: {
+    '@other/plugin': '*'
+  }
+})
+module.exports.PATCHED_PEER_DEPS_PKGJSON = Object.assign({}, module.exports.PKGJSON, {
+  peerDependencies:
+    { '@other/plugin': 'other/plugin#577c08e8fd5e1b3156ce75b2e5d9e3023dac180e' }
+})
 module.exports.PATCH = 'pkgjs/wiby#577c08e8fd5e1b3156ce75b2e5d9e3023dac180e'
+module.exports.DEV_DEP_PATCH = 'other/name#577c08e8fd5e1b3156ce75b2e5d9e3023dac180e'
+module.exports.PEER_DEP_PATCH = 'other/plugin#577c08e8fd5e1b3156ce75b2e5d9e3023dac180e'
 module.exports.PKG_NAME_UNIT = '@pkgjs/wiby'
 module.exports.PKG_NAME_INTEGRATION = 'wiby'
 module.exports.PKG_REPO = 'wiby'
@@ -17,3 +39,5 @@ module.exports.PKG_HEAD_SHA = '577c08e8fd5e1b3156ce75b2e5d9e3023dac180e'
 module.exports.DEP_REPO = 'pass'
 module.exports.DEP_ORG = 'wiby-test'
 module.exports.DEP_REPO_PERM = 'ADMIN'
+module.exports.DEV_DEP_PKG_NAME_UNIT = '@other/name'
+module.exports.DEV_PEER_PKG_NAME_UNIT = '@other/plugin'
diff --git a/test/test.js b/test/test.js
index ef60c7b..36065b5 100644
--- a/test/test.js
+++ b/test/test.js
@@ -15,10 +15,19 @@ tap.afterEach(async () => {
   nock.enableNetConnect()
 })
 
-tap.test('Check patch applied to package.json successfully', tap => {
+tap.test('Check patch applied to dependency package.json successfully', tap => {
   tap.equal(JSON.stringify(wiby.test.applyPatch(CONFIG.PATCH, CONFIG.PKG_NAME_UNIT, CONFIG.PKGJSON)), JSON.stringify(CONFIG.PATCHED_PKGJSON))
   tap.end()
 })
+tap.test('Check patch applied to dev dependency package.json successfully', tap => {
+  tap.equal(JSON.stringify(wiby.test.applyPatch(CONFIG.DEV_DEP_PATCH, CONFIG.DEV_DEP_PKG_NAME_UNIT, CONFIG.PKGJSON_DEV_DEPS)), JSON.stringify(CONFIG.PATCHED_DEV_DEPS_PKGJSON))
+  tap.end()
+})
+
+tap.test('Check patch applied to peer dependency package.json successfully', tap => {
+  tap.equal(JSON.stringify(wiby.test.applyPatch(CONFIG.PEER_DEP_PATCH, CONFIG.DEV_PEER_PKG_NAME_UNIT, CONFIG.PKGJSON_PEER_DEPS)), JSON.stringify(CONFIG.PATCHED_PEER_DEPS_PKGJSON))
+  tap.end()
+})
 
 tap.test('applyPatch() checks package exists in dependant package.json', tap => {
   tap.throws(
@@ -29,6 +38,15 @@ tap.test('applyPatch() checks package exists in dependant package.json', tap =>
         {
           dependencies: {
             'other-package': '*'
+          },
+          devDependencies: {
+            'further-packages': '*'
+          },
+          peerDependencies: {
+            'some-plugin': '*'
+          },
+          optionalDependencies: {
+            'some-optional-dep': '*'
           }
         }
       )