diff --git a/bin/next-dev b/bin/next-dev
index edf2255b..dc1693b0 100755
--- a/bin/next-dev
+++ b/bin/next-dev
@@ -62,7 +62,9 @@ srv.start(argv.port, argv.hostname)
 .catch((err) => {
   if (err.code === 'EADDRINUSE') {
     let errorMessage = `Port ${argv.port} is already in use.`
-    const pkgAppPath = require('pkg-up').sync('.')
+    const pkgAppPath = require('find-up').sync('package.json', {
+      cwd: dir
+    })
     const appPackage = JSON.parse(readFileSync(pkgAppPath, 'utf8'))
     const nextScript = Object.entries(appPackage.scripts).find(scriptLine => scriptLine[1] === 'next')
     if (nextScript) errorMessage += `\nUse \`npm run ${nextScript[0]} -- -p <some other port>\`.`
diff --git a/package.json b/package.json
index c19a555d..914d11f6 100644
--- a/package.json
+++ b/package.json
@@ -82,14 +82,11 @@
     "htmlescape": "1.1.1",
     "http-errors": "1.6.2",
     "http-status": "1.0.1",
-    "json-loader": "0.5.7",
     "loader-utils": "1.1.0",
     "minimist": "1.2.0",
     "mkdirp-then": "1.2.0",
-    "mv": "2.1.1",
     "mz": "2.7.0",
     "path-to-regexp": "2.1.0",
-    "pkg-up": "2.0.0",
     "prop-types": "15.6.0",
     "prop-types-exact": "1.1.1",
     "react-hot-loader": "4.0.0",
diff --git a/yarn.lock b/yarn.lock
index 538b498b..64da0f8b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2978,16 +2978,6 @@ glob@7.1.2, glob@^7.0.0, glob@^7.0.3, glob@^7.0.5, glob@^7.0.6, glob@^7.1.1, glo
     once "^1.3.0"
     path-is-absolute "^1.0.0"
 
-glob@^6.0.1:
-  version "6.0.4"
-  resolved "https://registry.yarnpkg.com/glob/-/glob-6.0.4.tgz#0f08860f6a155127b2fadd4f9ce24b1aab6e4d22"
-  dependencies:
-    inflight "^1.0.4"
-    inherits "2"
-    minimatch "2 || 3"
-    once "^1.3.0"
-    path-is-absolute "^1.0.0"
-
 global-dirs@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/global-dirs/-/global-dirs-0.1.1.tgz#b319c0dd4607f353f3be9cca4c72fc148c49f445"
@@ -3970,7 +3960,7 @@ jsesc@~0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-0.5.0.tgz#e7dee66e35d6fc16f710fe91d5cf69f70f08911d"
 
-json-loader@0.5.7, json-loader@^0.5.4:
+json-loader@^0.5.4:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/json-loader/-/json-loader-0.5.7.tgz#dca14a70235ff82f0ac9a3abeb60d337a365185d"
 
@@ -4458,7 +4448,7 @@ minimalistic-crypto-utils@^1.0.0, minimalistic-crypto-utils@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/minimalistic-crypto-utils/-/minimalistic-crypto-utils-1.0.1.tgz#f6c00c1c0b082246e5c4d99dfb8c7c083b2b582a"
 
-"minimatch@2 || 3", minimatch@^3.0.0, minimatch@^3.0.2, minimatch@^3.0.3, minimatch@^3.0.4:
+minimatch@^3.0.0, minimatch@^3.0.2, minimatch@^3.0.3, minimatch@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
   dependencies:
@@ -4545,14 +4535,6 @@ mute-stream@0.0.5:
   version "0.0.5"
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.5.tgz#8fbfabb0a98a253d3184331f9e8deb7372fac6c0"
 
-mv@2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/mv/-/mv-2.1.1.tgz#ae6ce0d6f6d5e0a4f7d893798d03c1ea9559b6a2"
-  dependencies:
-    mkdirp "~0.5.1"
-    ncp "~2.0.0"
-    rimraf "~2.4.0"
-
 mz@2.7.0:
   version "2.7.0"
   resolved "https://registry.yarnpkg.com/mz/-/mz-2.7.0.tgz#95008057a56cafadc2bc63dde7f9ff6955948e32"
@@ -4569,10 +4551,6 @@ natural-compare@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/natural-compare/-/natural-compare-1.4.0.tgz#4abebfeed7541f2c27acfb29bdbbd15c8d5ba4f7"
 
-ncp@~2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/ncp/-/ncp-2.0.0.tgz#195a21d6c46e361d2fb1281ba38b91e9df7bdbb3"
-
 negotiator@0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.1.tgz#2b327184e8992101177b28563fb5e7102acd0ca9"
@@ -5080,12 +5058,6 @@ pkg-dir@^2.0.0:
   dependencies:
     find-up "^2.1.0"
 
-pkg-up@2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/pkg-up/-/pkg-up-2.0.0.tgz#c819ac728059a461cab1c3889a2be3c49a004d7f"
-  dependencies:
-    find-up "^2.1.0"
-
 platform@^1.3.3:
   version "1.3.5"
   resolved "https://registry.yarnpkg.com/platform/-/platform-1.3.5.tgz#fb6958c696e07e2918d2eeda0f0bc9448d733444"
@@ -5917,12 +5889,6 @@ rimraf@2, rimraf@2.6.2, rimraf@^2.2.8, rimraf@^2.5.1, rimraf@^2.5.4, rimraf@^2.6
   dependencies:
     glob "^7.0.5"
 
-rimraf@~2.4.0:
-  version "2.4.5"
-  resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.4.5.tgz#ee710ce5d93a8fdb856fb5ea8ff0e2d75934b2da"
-  dependencies:
-    glob "^6.0.1"
-
 ripemd160@^2.0.0, ripemd160@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/ripemd160/-/ripemd160-2.0.1.tgz#0f4584295c53a3628af7e6d79aca21ce57d1c6e7"