diff --git a/.babelrc b/.babelrc
deleted file mode 100644
index 50f2ab3..0000000
--- a/.babelrc
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "only": "test"
-}
diff --git a/.eslintrc b/.eslintrc
index ca3c940..58ee886 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,3 +1,3 @@
 {
-  "extends": "groupon/node6"
+  "extends": "groupon/node8"
 }
diff --git a/.gitignore b/.gitignore
index aea58fb..b322bb5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
-/yarn.lock
-/package-lock.json
+/.nyc_output
 node_modules/
 npm-debug.log
 /tmp
diff --git a/.travis.yml b/.travis.yml
index 7a1bee6..95d1929 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,7 @@
 language: node_js
 node_js:
-  - v6.14.3
-  - v8.11.3
-  - v10.5.0
+  - 8.11.3
+  - 10.5.0
 deploy:
   - provider: script
     script: ./node_modules/.bin/nlm release
@@ -11,3 +10,5 @@ deploy:
       branch: master
       node: 10.5.0
 services: memcached
+before_install:
+  - npm i -g npm@^6
diff --git a/lib/cache.js b/lib/cache.js
index 43378fb..ac96e3a 100644
--- a/lib/cache.js
+++ b/lib/cache.js
@@ -76,6 +76,7 @@ Cache.prototype.end = function end() {
   if (this.backend && this.backend.end) {
     return this.backend.end();
   }
+  return null;
 };
 
 Cache.prototype.prepareOptions = function prepareOptions(options) {
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..2ecf7f0
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2158 @@
+{
+  "name": "cached",
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+      "dev": true,
+      "requires": {
+        "jsonparse": "^1.2.0",
+        "through": ">=2.2.7 <3"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.3.0.tgz",
+      "integrity": "sha512-Yej+zOJ1Dm/IMZzzj78OntP/r3zHEaKcyNoU2lAaxPtrseM6rF0xwqoz5Q5ysAiED9hTjI2hgtvLXitlCN1/Ug==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "dev": true,
+      "requires": {
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+        "acorn": {
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+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
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+        "co": "^4.6.0",
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+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.3.0"
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+      "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg==",
+      "dev": true
+    },
+    "semver": {
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.4.1.tgz",
+      "integrity": "sha512-WfG/X9+oATh81XtllIo/I8gOiY9EXRdv1cQdyykeXK17YcUW3EXUAi2To4pcH6nZtJPr7ZOpM5OMyWJZm+8Rsg==",
+      "dev": true
+    },
+    "shebang-command": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
+      "integrity": "sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=",
+      "dev": true,
+      "requires": {
+        "shebang-regex": "^1.0.0"
+      }
+    },
+    "shebang-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz",
+      "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=",
+      "dev": true
+    },
+    "signal-exit": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
+      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
+      "dev": true
+    },
+    "simple-lru-cache": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/simple-lru-cache/-/simple-lru-cache-0.0.2.tgz",
+      "integrity": "sha1-1ZzDoZPBpdAyD4Tucy9uRxPlEd0="
+    },
+    "slice-ansi": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-1.0.0.tgz",
+      "integrity": "sha512-POqxBK6Lb3q6s047D/XsDVNPnF9Dl8JSaqe9h9lURl0OdNqy/ujDrOiIHtsqXMGbWWTIomRzAMaTyawAU//Reg==",
+      "dev": true,
+      "requires": {
+        "is-fullwidth-code-point": "^2.0.0"
+      }
+    },
+    "spdx-correct": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-1.0.2.tgz",
+      "integrity": "sha1-SzBz2TP/UfORLwOsVRlJikFQ20A=",
+      "dev": true,
+      "requires": {
+        "spdx-license-ids": "^1.0.2"
+      }
+    },
+    "spdx-expression-parse": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-1.0.4.tgz",
+      "integrity": "sha1-m98vIOH0DtRH++JzJmGR/O1RYmw=",
+      "dev": true
+    },
+    "spdx-license-ids": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-1.2.2.tgz",
+      "integrity": "sha1-yd96NCRZSt5r0RkA1ZZpbcBrrFc=",
+      "dev": true
+    },
+    "split2": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/split2/-/split2-2.2.0.tgz",
+      "integrity": "sha512-RAb22TG39LhI31MbreBgIuKiIKhVsawfTgEGqKHTK87aG+ul/PB8Sqoi3I7kVdRWiCfrKxK3uo4/YUkpNvhPbw==",
+      "dev": true,
+      "requires": {
+        "through2": "^2.0.2"
+      }
+    },
+    "sprintf-js": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "dev": true
+    },
+    "string-width": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+      "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+      "dev": true,
+      "requires": {
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^4.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
+      }
+    },
+    "string_decoder": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
+      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
+    "strip-ansi": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+      "dev": true,
+      "requires": {
+        "ansi-regex": "^2.0.0"
+      }
+    },
+    "strip-bom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+      "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
+      "dev": true
+    },
+    "strip-indent": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-2.0.0.tgz",
+      "integrity": "sha1-XvjbKV0B5u1sv3qrlpmNeCJSe2g=",
+      "dev": true
+    },
+    "strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
+      "dev": true
+    },
+    "supports-color": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+      "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+      "dev": true
+    },
+    "table": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/table/-/table-4.0.2.tgz",
+      "integrity": "sha512-UUkEAPdSGxtRpiV9ozJ5cMTtYiqz7Ni1OGqLXRCynrvzdtR1p+cfOWe2RJLwvUG8hNanaSRjecIqwOjqeatDsA==",
+      "dev": true,
+      "requires": {
+        "ajv": "^5.2.3",
+        "ajv-keywords": "^2.1.0",
+        "chalk": "^2.1.0",
+        "lodash": "^4.17.4",
+        "slice-ansi": "1.0.0",
+        "string-width": "^2.1.1"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "3.2.0",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.0.tgz",
+          "integrity": "sha512-NnSOmMEYtVR2JVMIGTzynRkkaxtiq1xnFBcdQD/DnNCYPoEPsVJhM98BDyaoNOQIi7p4okdi3E27eN7GQbsUug==",
+          "dev": true,
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
+        },
+        "chalk": {
+          "version": "2.3.0",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.3.0.tgz",
+          "integrity": "sha512-Az5zJR2CBujap2rqXGaJKaPHyJ0IrUimvYNX+ncCy8PJP4ltOGTrHUIo097ZaL2zMeKYpiCdqDvS6zdrTFok3Q==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.1.0",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^4.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "4.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.5.0.tgz",
+          "integrity": "sha1-vnoN5ITexcXN34s9WRJQRJEvY1s=",
+          "dev": true,
+          "requires": {
+            "has-flag": "^2.0.0"
+          }
+        }
+      }
+    },
+    "text-extensions": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/text-extensions/-/text-extensions-1.8.0.tgz",
+      "integrity": "sha512-mVzjRxuWnDKs/qH1rbOJEVHLlSX9kty9lpi7lMvLgU9S74mQ8/Ozg9UPcKxShh0qG2NZ+NyPOPpcZU4C1Eld9A==",
+      "dev": true
+    },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
+    },
+    "through2": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.3.tgz",
+      "integrity": "sha1-AARWmzfHx0ujnEPzzteNGtlBQL4=",
+      "dev": true,
+      "requires": {
+        "readable-stream": "^2.1.5",
+        "xtend": "~4.0.1"
+      }
+    },
+    "tmp": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "~1.0.2"
+      }
+    },
+    "trim-newlines": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-2.0.0.tgz",
+      "integrity": "sha1-tAPQuRvlDDMd/EuC7s6yLD3hbSA=",
+      "dev": true
+    },
+    "trim-off-newlines": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/trim-off-newlines/-/trim-off-newlines-1.0.1.tgz",
+      "integrity": "sha1-n5up2e+odkw4dpi8v+sshI8RrbM=",
+      "dev": true
+    },
+    "type-check": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "~1.1.2"
+      }
+    },
+    "typedarray": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
+      "dev": true
+    },
+    "url": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/url/-/url-0.11.0.tgz",
+      "integrity": "sha1-ODjpfPxgUh63PFJajlW/3Z4uKPE=",
+      "dev": true,
+      "requires": {
+        "punycode": "1.3.2",
+        "querystring": "0.2.0"
+      }
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
+    "validate-npm-package-license": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz",
+      "integrity": "sha1-KAS6vnEq0zeUWaz74kdGqywwP7w=",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "~1.0.0",
+        "spdx-expression-parse": "~1.0.0"
+      }
+    },
+    "which": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
+      "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
+      "dev": true,
+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index ebfe649..2527e3f 100644
--- a/package.json
+++ b/package.json
@@ -15,8 +15,11 @@
   "scripts": {
     "pretest": "eslint lib test",
     "test": "mocha",
-    "posttest": "nlm verify",
-    "watch": "mocha --watch"
+    "posttest": "nlm verify"
+  },
+  "engines": {
+    "yarn": "0.0.0",
+    "npm": "^6.0.0"
   },
   "nlm": {
     "license": {
@@ -31,17 +34,15 @@
   },
   "devDependencies": {
     "assertive": "^2.1.0",
-    "babel-cli": "^6.24.1",
-    "babel-core": "^5.8.33",
-    "babel-eslint": "^8.1.2",
-    "babel-preset-env": "^1.6.0",
     "eslint": "^4.7.1",
-    "eslint-config-groupon": "^5.0.0",
+    "eslint-config-groupon": "^6.0.0",
     "eslint-plugin-import": "^2.8.0",
-    "eslint-plugin-node": "^5.2.1",
+    "eslint-plugin-mocha": "^4.12.1",
+    "eslint-plugin-node": "^5.1.1",
     "eslint-plugin-prettier": "^2.2.0",
+    "lodash": "^4.17.11",
     "mocha": "^5.2.0",
-    "nlm": "^3.3.1",
+    "nlm": "^3.3.4",
     "prettier": "^1.6.1"
   },
   "author": {
diff --git a/test/.eslintrc b/test/.eslintrc
index 249ac66..7eeefc3 100644
--- a/test/.eslintrc
+++ b/test/.eslintrc
@@ -1,12 +1,5 @@
 {
   "env": {
     "mocha": true
-  },
-  "parser": "babel-eslint",
-  "parserOptions": {
-    "sourceType": "module",
-    "allowImportExportEverywhere": true,
-    "codeFrame": false
-  },
-  "root": true
+  }
 }
diff --git a/test/_backends.js b/test/_backends.js
index 29995a4..749e689 100644
--- a/test/_backends.js
+++ b/test/_backends.js
@@ -1,12 +1,14 @@
-import { defaults } from 'lodash';
+'use strict';
 
-import Cache from '../lib/cache';
+const { defaults } = require('lodash');
+
+const Cache = require('../lib/cache');
 
 const backendOptions = {
   hosts: `${process.env.MEMCACHED__HOST || '127.0.0.1'}:11211`,
 };
 
-export default function withBackends(createTestCases) {
+module.exports = function withBackends(createTestCases) {
   ['memory', 'memcached'].forEach(backendType => {
     describe(`with backend "${backendType}"`, () => {
       const cache = new Cache({
@@ -19,4 +21,4 @@ export default function withBackends(createTestCases) {
       createTestCases(cache);
     });
   });
-}
+};
diff --git a/test/_unhandled-rejection.js b/test/_unhandled-rejection.js
index 1571cb5..064c1b3 100644
--- a/test/_unhandled-rejection.js
+++ b/test/_unhandled-rejection.js
@@ -1,5 +1,7 @@
+'use strict';
+
 /* eslint no-console:0 */
-import Bluebird from 'bluebird';
+const Bluebird = require('bluebird');
 
 const unhandledRejections = [];
 Bluebird.onPossiblyUnhandledRejection(error => {
diff --git a/test/cache.test.js b/test/cache.test.js
index 9c34914..5e207c2 100644
--- a/test/cache.test.js
+++ b/test/cache.test.js
@@ -1,6 +1,8 @@
-import assert from 'assertive';
+'use strict';
 
-import Cache from '../lib/cache';
+const assert = require('assertive');
+
+const Cache = require('../lib/cache');
 
 describe('Cache', () => {
   it('always has a backend', () => {
diff --git a/test/cached.test.js b/test/cached.test.js
index 9b4cb93..28690d4 100644
--- a/test/cached.test.js
+++ b/test/cached.test.js
@@ -1,6 +1,8 @@
-import assert from 'assertive';
+'use strict';
 
-import cached from '..';
+const assert = require('assertive');
+
+const cached = require('..');
 
 describe('cached', () => {
   beforeEach(() => cached.dropNamedCaches());
diff --git a/test/get-or-else.test.js b/test/get-or-else.test.js
index ec215a0..41f28cb 100644
--- a/test/get-or-else.test.js
+++ b/test/get-or-else.test.js
@@ -1,9 +1,10 @@
-import assert from 'assertive';
-import Bluebird from 'bluebird';
+'use strict';
 
-import Cache from '../lib/cache';
+const assert = require('assertive');
+const Bluebird = require('bluebird');
 
-import withBackends from './_backends';
+const Cache = require('../lib/cache');
+const withBackends = require('./_backends');
 
 function assertRejects(promise) {
   return promise.then(() => {
diff --git a/test/get-set.test.js b/test/get-set.test.js
index 3e40c46..f87c9b2 100644
--- a/test/get-set.test.js
+++ b/test/get-set.test.js
@@ -1,7 +1,9 @@
-import assert from 'assertive';
-import Bluebird from 'bluebird';
+'use strict';
 
-import withBackends from './_backends';
+const assert = require('assertive');
+const Bluebird = require('bluebird');
+
+const withBackends = require('./_backends');
 
 describe('Cache::{get,set,unset}', () => {
   withBackends(cache => {
@@ -16,8 +18,9 @@ describe('Cache::{get,set,unset}', () => {
           } catch (error) {
             assertError = error;
           }
-          done(assertError);
+          return done(assertError);
         });
+        return null;
       });
     });
 
@@ -39,9 +42,11 @@ describe('Cache::{get,set,unset}', () => {
             } catch (error) {
               assertError = error;
             }
-            done(assertError);
+            return done(assertError);
           });
+          return null;
         });
+        return null;
       });
     });
 
diff --git a/test/mocha.opts b/test/mocha.opts
index 81e8305..3e51a2f 100644
--- a/test/mocha.opts
+++ b/test/mocha.opts
@@ -1,4 +1,3 @@
 --recursive
 --timeout 6000
 --slow 4000
---compilers js:babel-core/register
diff --git a/test/prefix.test.js b/test/prefix.test.js
index fed6365..0f495b9 100644
--- a/test/prefix.test.js
+++ b/test/prefix.test.js
@@ -1,6 +1,8 @@
-import assert from 'assertive';
+'use strict';
 
-import cached from '..';
+const assert = require('assertive');
+
+const cached = require('..');
 
 describe('cache prefix', () => {
   it('adds a prefix to named cached', async () => {
diff --git a/test/timeout.test.js b/test/timeout.test.js
index 21e2a01..b1d724f 100644
--- a/test/timeout.test.js
+++ b/test/timeout.test.js
@@ -1,8 +1,11 @@
-import assert from 'assertive';
-import Bluebird from 'bluebird';
+'use strict';
+
+const assert = require('assertive');
+const Bluebird = require('bluebird');
+
 const identity = val => val;
 
-import Cache from '../lib/cache';
+const Cache = require('../lib/cache');
 
 describe('Cache timeouts', () => {
   const cache = new Cache({