diff --git a/circle.yml b/circle.yml
index 77396f99..0162d93f 100644
--- a/circle.yml
+++ b/circle.yml
@@ -2,24 +2,14 @@
 
 machine:
   node:
-    version: 6.11.2
+    version: 6.11.4
   environment:
-    YARN_VERSION: 0.27.5
-    PATH: "${PATH}:${HOME}/.yarn/bin:${HOME}/${CIRCLE_PROJECT_REPONAME}/node_modules/.bin"
+    PATH: "${PATH}:${HOME}/${CIRCLE_PROJECT_REPONAME}/node_modules/.bin"
 
 dependencies:
-  pre:
-    - |
-      if [[ ! -e ~/.yarn/bin/yarn || $(yarn --version) != "${YARN_VERSION}" ]]; then
-        echo "Download and install Yarn."
-        curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version $YARN_VERSION
-      else
-        echo "The correct version of Yarn is already installed."
-      fi
   override:
-    - yarn install
+    - yarn
   cache_directories:
-    - ~/.yarn
     - ~/.cache/yarn
 
 test:
diff --git a/package.json b/package.json
index 168fad07..41e4c964 100644
--- a/package.json
+++ b/package.json
@@ -62,7 +62,7 @@
     "heroku-postbuild": "yarn run build"
   },
   "engines": {
-    "node": "6.11.2",
-    "yarn": "0.27.5"
+    "node": "6.11.4",
+    "yarn": "1.2.1"
   }
 }