diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6775c185..798cefbc 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -12,8 +12,8 @@ jobs:
       - checkout
       - restore_cache: &restore_cache
           keys:
-            - v2-yarn-{{checksum ".circleci/config.yml"}}-{{ checksum "yarn.lock"}}
-            - v2-yarn-{{checksum ".circleci/config.yml"}}
+            - v3-yarn-{{checksum ".circleci/config.yml"}}-{{ checksum "yarn.lock"}}
+            - v3-yarn-{{checksum ".circleci/config.yml"}}
       - run: .circleci/greenkeeper
       - run: yarn add -D nyc@11 @oclif/nyc-config@1 mocha-junit-reporter@1
       - run: ./bin/run --help
@@ -40,7 +40,7 @@ jobs:
           export PATH=/usr/local/share/.config/yarn/global/node_modules/.bin:$PATH
           semantic-release -e @oclif/semantic-release
       - save_cache:
-          key: v2-yarn-{{checksum ".circleci/config.yml"}}-{{checksum "yarn.lock"}}
+          key: v3-yarn-{{checksum ".circleci/config.yml"}}-{{checksum "yarn.lock"}}
           paths:
             - ~/cli/node_modules
             - /usr/local/share/.cache/yarn
diff --git a/.circleci/greenkeeper b/.circleci/greenkeeper
index bf73a3e4..4f6d324f 100755
--- a/.circleci/greenkeeper
+++ b/.circleci/greenkeeper
@@ -17,7 +17,7 @@ if [[ ! -z "$GIT_EMAIL" ]] & [[ ! -z "$GIT_USERNAME" ]]; then
 fi
 
 if [[ ! -x "$(command -v greenkeeper-lockfile-update)" ]]; then
-  yarn global add greenkeeper-lockfile@1
+  yarn global add greenkeeper-lockfile@2
 fi
 
 greenkeeper-lockfile-update
diff --git a/package.json b/package.json
index 0a73f6be..0b2baf1b 100644
--- a/package.json
+++ b/package.json
@@ -8,22 +8,22 @@
     "@oclif/color": "^0.0.0",
     "@oclif/command": "^1.5.0",
     "chalk": "^2.4.1",
-    "cli-ux": "^4.7.3",
+    "cli-ux": "^4.8.0",
     "debug": "^3.1.0",
     "fs-extra": "^7.0.0",
-    "http-call": "^5.1.4",
+    "http-call": "^5.2.0",
     "load-json-file": "^5.0.0",
     "npm-run-path": "^2.0.2",
-    "semver": "^5.5.0",
+    "semver": "^5.5.1",
     "tslib": "^1.9.3",
     "yarn": "^1.9.4"
   },
   "devDependencies": {
     "@oclif/config": "^1.7.0",
-    "@oclif/dev-cli": "^1.16.0",
-    "@oclif/errors": "^1.1.2",
-    "@oclif/plugin-help": "^2.0.5",
-    "@oclif/test": "^1.1.0",
+    "@oclif/dev-cli": "^1.17.0",
+    "@oclif/errors": "^1.2.0",
+    "@oclif/plugin-help": "^2.1.0",
+    "@oclif/test": "^1.2.0",
     "@oclif/tslint": "^2.0.0",
     "@types/chai": "^4.1.4",
     "@types/fs-extra": "^5.0.4",
@@ -34,7 +34,7 @@
     "@types/supports-color": "^5.3.0",
     "chai": "^4.1.2",
     "concurrently": "^3.6.1",
-    "fancy-test": "^1.2.0",
+    "fancy-test": "^1.3.0",
     "globby": "^8.0.1",
     "mocha": "^5.2.0",
     "ts-node": "^7.0.1",
diff --git a/src/plugins.ts b/src/plugins.ts
index 7173fd56..2200151e 100644
--- a/src/plugins.ts
+++ b/src/plugins.ts
@@ -205,10 +205,14 @@ export default class Plugins {
     return path.join(this.config.dataDir, 'package.json')
   }
 
+  private get npmRegistry(): string {
+    return this.config.npmRegistry || 'https://registry.npmjs.org'
+  }
+
   private async npmHasPackage(name: string): Promise<boolean> {
     try {
       const http: typeof HTTP = require('http-call').HTTP
-      let url = `${this.config.npmRegistry}/-/package/${name.replace('/', '%2f')}/dist-tags`
+      let url = `${this.npmRegistry}/-/package/${name.replace('/', '%2f')}/dist-tags`
       await http.get(url)
       return true
     } catch (err) {
diff --git a/yarn.lock b/yarn.lock
index 37798143..dbd66cdf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -38,7 +38,7 @@
     supports-color "^5.4.0"
     tslib "^1"
 
-"@oclif/command@^1.4.30", "@oclif/command@^1.4.36", "@oclif/command@^1.5.0":
+"@oclif/command@^1.5.0":
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/@oclif/command/-/command-1.5.0.tgz#d5276a19506349fff0254b0dd98e3b8a2bd971aa"
   dependencies:
@@ -47,22 +47,22 @@
     debug "^3.1.0"
     semver "^5.5.0"
 
-"@oclif/config@^1.6.33", "@oclif/config@^1.7.0":
+"@oclif/config@^1.7.0":
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/@oclif/config/-/config-1.7.0.tgz#deb465093d10a1ee802cca7580cd2d33f78d9d60"
   dependencies:
     debug "^3.1.0"
     tslib "^1.9.3"
 
-"@oclif/dev-cli@^1.16.0":
-  version "1.16.0"
-  resolved "https://registry.yarnpkg.com/@oclif/dev-cli/-/dev-cli-1.16.0.tgz#a535deac47f87891760fa230d7b8084466266734"
+"@oclif/dev-cli@^1.17.0":
+  version "1.17.0"
+  resolved "https://registry.yarnpkg.com/@oclif/dev-cli/-/dev-cli-1.17.0.tgz#b7af28a79f792f5981c43e104a667dfb5df28595"
   dependencies:
-    "@oclif/command" "^1.4.36"
-    "@oclif/config" "^1.6.33"
-    "@oclif/errors" "^1.1.2"
-    "@oclif/plugin-help" "^2.0.5"
-    cli-ux "^4.7.3"
+    "@oclif/command" "^1.5.0"
+    "@oclif/config" "^1.7.0"
+    "@oclif/errors" "^1.2.0"
+    "@oclif/plugin-help" "^2.1.0"
+    cli-ux "^4.8.0"
     debug "^3.1.0"
     fs-extra "^7.0.0"
     lodash "^4.17.10"
@@ -80,6 +80,16 @@
     strip-ansi "^4.0.0"
     wrap-ansi "^3.0.1"
 
+"@oclif/errors@^1.2.0":
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/@oclif/errors/-/errors-1.2.0.tgz#4166952699724c25af2ab4528fe223e930655e72"
+  dependencies:
+    clean-stack "^1.3.0"
+    fs-extra "^7.0.0"
+    indent-string "^3.2.0"
+    strip-ansi "^4.0.0"
+    wrap-ansi "^3.0.1"
+
 "@oclif/linewrap@^1.0.0":
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/@oclif/linewrap/-/linewrap-1.0.0.tgz#aedcb64b479d4db7be24196384897b5000901d91"
@@ -92,11 +102,11 @@
     chalk "^2.4.1"
     tslib "^1.9.3"
 
-"@oclif/plugin-help@^2.0.5":
-  version "2.0.5"
-  resolved "https://registry.yarnpkg.com/@oclif/plugin-help/-/plugin-help-2.0.5.tgz#98084286099b44c8c6ed6214e3589f32525f4827"
+"@oclif/plugin-help@^2.1.0":
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/@oclif/plugin-help/-/plugin-help-2.1.0.tgz#eb0748904558b8e379416ab3ef7bbefed2151348"
   dependencies:
-    "@oclif/command" "^1.4.30"
+    "@oclif/command" "^1.5.0"
     chalk "^2.4.1"
     indent-string "^3.2.0"
     lodash.template "^4.4.0"
@@ -108,11 +118,11 @@
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/@oclif/screen/-/screen-1.0.2.tgz#c9d7c84b0ea60ecec8dd7a9b22c012ba9967aed8"
 
-"@oclif/test@^1.1.0":
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/@oclif/test/-/test-1.1.0.tgz#63eea93f3b20ff534831b1a281d217eb02073a9c"
+"@oclif/test@^1.2.0":
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/@oclif/test/-/test-1.2.0.tgz#764ca66215f5bd36c0b5cbcbfc5963f0271825b8"
   dependencies:
-    fancy-test "^1.2.0"
+    fancy-test "^1.3.0"
 
 "@oclif/tslint@^2.0.0":
   version "2.0.0"
@@ -134,21 +144,21 @@
   version "2.0.7"
   resolved "https://registry.yarnpkg.com/@types/load-json-file/-/load-json-file-2.0.7.tgz#c887826f5230b7507d5230994d26315c6776be06"
 
-"@types/lodash@^4.14.109":
+"@types/lodash@^4.14.116":
   version "4.14.116"
   resolved "https://registry.yarnpkg.com/@types/lodash/-/lodash-4.14.116.tgz#5ccf215653e3e8c786a58390751033a9adca0eb9"
 
-"@types/mocha@^5.2.2", "@types/mocha@^5.2.5":
+"@types/mocha@^5.2.5":
   version "5.2.5"
   resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-5.2.5.tgz#8a4accfc403c124a0bafe8a9fc61a05ec1032073"
 
-"@types/nock@^9.1.3":
+"@types/nock@^9.3.0":
   version "9.3.0"
   resolved "https://registry.yarnpkg.com/@types/nock/-/nock-9.3.0.tgz#9d34358fdcc08afd07144e0784ac9e951d412dd4"
   dependencies:
     "@types/node" "*"
 
-"@types/node@*", "@types/node@^10.3.3", "@types/node@^10.7.1":
+"@types/node@*", "@types/node@^10.7.1":
   version "10.7.1"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-10.7.1.tgz#b704d7c259aa40ee052eec678758a68d07132a2e"
 
@@ -393,9 +403,9 @@ clean-stack@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/clean-stack/-/clean-stack-1.3.0.tgz#9e821501ae979986c46b1d66d2d432db2fd4ae31"
 
-cli-ux@^4.7.3:
-  version "4.7.3"
-  resolved "https://registry.yarnpkg.com/cli-ux/-/cli-ux-4.7.3.tgz#5b7f5e70105fde53883c5307a88e2f29f64236c4"
+cli-ux@^4.8.0:
+  version "4.8.0"
+  resolved "https://registry.yarnpkg.com/cli-ux/-/cli-ux-4.8.0.tgz#4013e177bfb6a2138565c071ef99f4a13e1cab20"
   dependencies:
     "@oclif/linewrap" "^1.0.0"
     "@oclif/screen" "^1.0.2"
@@ -404,12 +414,12 @@ cli-ux@^4.7.3:
     chalk "^2.4.1"
     clean-stack "^1.3.0"
     extract-stack "^1.0.0"
-    fs-extra "^6.0.1"
+    fs-extra "^7.0.0"
     hyperlinker "^1.0.0"
     indent-string "^3.2.0"
     is-wsl "^1.1.0"
     lodash "^4.17.10"
-    password-prompt "^1.0.6"
+    password-prompt "^1.0.7"
     semver "^5.5.0"
     strip-ansi "^4.0.0"
     supports-color "^5.4.0"
@@ -637,15 +647,15 @@ extract-stack@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/extract-stack/-/extract-stack-1.0.0.tgz#b97acaf9441eea2332529624b732fc5a1c8165fa"
 
-fancy-test@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/fancy-test/-/fancy-test-1.2.0.tgz#c5f6f81725ea42b9caec9bb18731449cfab526f3"
+fancy-test@^1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/fancy-test/-/fancy-test-1.3.0.tgz#014b63b5be0dd2dde602ec677cec443f34578f37"
   dependencies:
     "@types/chai" "^4.1.4"
-    "@types/lodash" "^4.14.109"
-    "@types/mocha" "^5.2.2"
-    "@types/nock" "^9.1.3"
-    "@types/node" "^10.3.3"
+    "@types/lodash" "^4.14.116"
+    "@types/mocha" "^5.2.5"
+    "@types/nock" "^9.3.0"
+    "@types/node" "^10.7.1"
     "@types/sinon" "^5.0.1"
     lodash "^4.17.10"
     mock-stdin "^0.3.1"
@@ -822,7 +832,7 @@ hosted-git-info@^2.1.4:
   version "2.7.1"
   resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-2.7.1.tgz#97f236977bd6e125408930ff6de3eec6281ec047"
 
-http-call@^5.1.2, http-call@^5.1.4:
+http-call@^5.1.2:
   version "5.1.4"
   resolved "https://registry.yarnpkg.com/http-call/-/http-call-5.1.4.tgz#fc37a1f6638ece82aba3d12eb6030f0889da850a"
   dependencies:
@@ -832,6 +842,16 @@ http-call@^5.1.2, http-call@^5.1.4:
     is-stream "^1.1.0"
     tunnel-agent "^0.6.0"
 
+http-call@^5.2.0:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/http-call/-/http-call-5.2.0.tgz#9e923cbc51c2d0d78c286e8ad913d666e2e46682"
+  dependencies:
+    content-type "^1.0.4"
+    debug "^3.1.0"
+    is-retry-allowed "^1.1.0"
+    is-stream "^1.1.0"
+    tunnel-agent "^0.6.0"
+
 hyperlinker@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/hyperlinker/-/hyperlinker-1.0.0.tgz#23dc9e38a206b208ee49bc2d6c8ef47027df0c0e"
@@ -1277,7 +1297,7 @@ pascalcase@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/pascalcase/-/pascalcase-0.1.1.tgz#b363e55e8006ca6fe21784d2db22bd15d7917f14"
 
-password-prompt@^1.0.6:
+password-prompt@^1.0.7:
   version "1.0.7"
   resolved "https://registry.yarnpkg.com/password-prompt/-/password-prompt-1.0.7.tgz#8e27748d3400bc9c9140d5ade705dfb7aeb7d91a"
   dependencies:
@@ -1434,6 +1454,10 @@ safe-regex@^1.1.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
 
+semver@^5.5.1:
+  version "5.5.1"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.1.tgz#7dfdd8814bdb7cabc7be0fb1d734cfb66c940477"
+
 set-value@^0.4.3:
   version "0.4.3"
   resolved "https://registry.yarnpkg.com/set-value/-/set-value-0.4.3.tgz#7db08f9d3d22dc7f78e53af3c3bf4666ecdfccf1"