diff --git a/package-lock.json b/package-lock.json
index c121663..8b82b1c 100644
--- a/package-lock.json
+++ b/package-lock.json
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+          "version": "1.10.1",
+          "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.10.1.tgz",
+          "integrity": "sha512-KuIe4mf++td/eFb6wkaPbMDnP6kObCaEtIDuHOUED6MNUo4K670KZUHuuvYPZDxNF0WVLw49n06M2m2dXphEzA==",
           "dev": true,
           "requires": {
-            "events-to-array": "^1.0.1",
-            "js-yaml": "^3.2.7",
-            "readable-stream": "^2"
+            "path-parse": "^1.0.6"
           }
         }
       }
     },
-    "tap-parser": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/tap-parser/-/tap-parser-7.0.0.tgz",
-      "integrity": "sha512-05G8/LrzqOOFvZhhAk32wsGiPZ1lfUrl+iV7+OkKgfofZxiceZWMHkKmow71YsyVQ8IvGBP2EjcIjE5gL4l5lA==",
-      "dev": true,
-      "requires": {
-        "events-to-array": "^1.0.1",
-        "js-yaml": "^3.2.7",
-        "minipass": "^2.2.0"
-      }
-    },
-    "tmatch": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/tmatch/-/tmatch-4.0.0.tgz",
-      "integrity": "sha512-Ynn2Gsp+oCvYScQXeV+cCs7citRDilq0qDXA6tuvFwDgiYyyaq7D5vKUlAPezzZR5NDobc/QMeN6e5guOYmvxg==",
-      "dev": true
-    },
-    "tough-cookie": {
-      "version": "2.4.3",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
-      "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
-      "dev": true,
-      "requires": {
-        "psl": "^1.1.24",
-        "punycode": "^1.4.1"
-      }
-    },
-    "trivial-deferred": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/trivial-deferred/-/trivial-deferred-1.0.1.tgz",
-      "integrity": "sha1-N21NKdlR1jaKb3oK6FwvTV4GWPM=",
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
       "dev": true
     },
     "ts-node": {
@@ -4128,28 +619,6 @@
         }
       }
     },
-    "tsame": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/tsame/-/tsame-2.0.0.tgz",
-      "integrity": "sha512-dAuzcnOPdqZYojylFQzEes95UDjve3HqKrlTCeLZKSDPMTsn3smzHZqsJj/sWD8wOUkg0RD++B11evyLn2+bIw==",
-      "dev": true
-    },
-    "tunnel-agent": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
-      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
-      "dev": true,
-      "requires": {
-        "safe-buffer": "^5.0.1"
-      }
-    },
-    "tweetnacl": {
-      "version": "0.14.5",
-      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true,
-      "optional": true
-    },
     "type-check": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
@@ -4166,21 +635,15 @@
       "dev": true
     },
     "uglify-js": {
-      "version": "3.3.12",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.3.12.tgz",
-      "integrity": "sha512-4jxrTXlV0HaXTsNILfXW0eey7Qo8qHYM6ih5ZNh45erDWU2GHmKDmekwBTskDb12h+kdd2DBvdzqVb47YzNmTA==",
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
+      "integrity": "sha512-W+jrUHJr3DXKhrsS7NUVxn3zqMOFn0hL/Ei6v0anCIMoKC93TjcflTagwIHLW7SfMFfiQuktQyFVCFHGUE0+yg==",
       "dev": true,
       "requires": {
-        "commander": "~2.14.1",
+        "commander": "~2.20.0",
         "source-map": "~0.6.1"
       },
       "dependencies": {
-        "commander": {
-          "version": "2.14.1",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.14.1.tgz",
-          "integrity": "sha512-+YR16o3rK53SmWHU3rEM3tPAh2rwb1yPcQX5irVn7mb0gXbwuCCrnkbV5+PBfETdfg1vui07nM6PCG1zndcjQw==",
-          "dev": true
-        },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -4189,60 +652,11 @@
         }
       }
     },
-    "unicode-length": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/unicode-length/-/unicode-length-1.0.3.tgz",
-      "integrity": "sha1-Wtp6f+1RhBpBijKM8UlHisg1irs=",
-      "dev": true,
-      "requires": {
-        "punycode": "^1.3.2",
-        "strip-ansi": "^3.0.1"
-      }
-    },
-    "util-deprecate": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "dev": true,
-      "optional": true
-    },
-    "uuid": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
-      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
-      "dev": true
-    },
     "v8-argv": {
       "version": "github:jkroso/v8-argv#284f84379e292eb956a5e7b66fb953ec4974385e",
-      "from": "v8-argv@github:jkroso/v8-argv#284f84379e292eb956a5e7b66fb953ec4974385e",
-      "dev": true
-    },
-    "verror": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
-      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
-      "dev": true,
-      "requires": {
-        "assert-plus": "^1.0.0",
-        "core-util-is": "1.0.2",
-        "extsprintf": "^1.2.0"
-      }
-    },
-    "vlq": {
-      "version": "0.2.2",
-      "resolved": "https://registry.npmjs.org/vlq/-/vlq-0.2.2.tgz",
-      "integrity": "sha1-4xbVJXtAuGu0PLjV/qXX9U1rDKE=",
+      "from": "github:jkroso/v8-argv#1.1.1",
       "dev": true
     },
-    "which": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
-      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
-      "dev": true,
-      "requires": {
-        "isexe": "^2.0.0"
-      }
-    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -4255,29 +669,6 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
-    "write-file-atomic": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.3.0.tgz",
-      "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
-      "dev": true,
-      "requires": {
-        "graceful-fs": "^4.1.11",
-        "imurmurhash": "^0.1.4",
-        "signal-exit": "^3.0.2"
-      }
-    },
-    "yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
-    },
-    "yapool": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/yapool/-/yapool-1.0.0.tgz",
-      "integrity": "sha1-9pPymjFbUNmp2iZGp6ZkXJaYW2o=",
-      "dev": true
-    },
     "yn": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
diff --git a/package.json b/package.json
index 7e8a865..0b84f37 100644
--- a/package.json
+++ b/package.json
@@ -22,21 +22,22 @@
   },
   "scripts": {
     "build": "rollup -c",
-    "test": "npm run build && tap test/*.js && jsmd readme.md && npm run test:typescript",
+    "test": "npm run build && tape test/*.js && jsmd readme.md && npm run test:typescript",
     "test:typescript": "tsc --noEmit test/typescript.ts && ts-node test/typescript.ts",
     "size": "npm run build && uglifyjs --compress --mangle -- ./dist/umd.js | gzip -c | wc -c"
   },
   "devDependencies": {
+    "@types/node": "^8.10.49",
     "is-mergeable-object": "1.1.0",
     "is-plain-object": "^2.0.4",
-    "jsmd": "0.3.1",
-    "rollup": "0.49.3",
-    "rollup-plugin-commonjs": "8.2.1",
-    "rollup-plugin-node-resolve": "3.0.0",
-    "tap": "12.0.1",
+    "jsmd": "^1.0.1",
+    "rollup": "^1.15.5",
+    "rollup-plugin-commonjs": "^10.0.0",
+    "rollup-plugin-node-resolve": "^5.0.2",
+    "tape": "^4.10.2",
     "ts-node": "7.0.1",
     "typescript": "=2.2.2",
-    "uglify-js": "^3.3.12"
+    "uglify-js": "^3.6.0"
   },
   "license": "MIT",
   "dependencies": {}
diff --git a/readme.md b/readme.md
index 5bd8cb7..d0544c2 100644
--- a/readme.md
+++ b/readme.md
@@ -2,7 +2,7 @@
 
 Merges the enumerable attributes of two or more objects deeply.
 
-> UMD bundle is 593B minified+gzipped
+> UMD bundle is 587B minified+gzipped
 
 
 ### Migration from 1.x to 2+
diff --git a/rollup.config.js b/rollup.config.js
index 2e54080..e35af7a 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -5,12 +5,15 @@ const pkg = require(`./package.json`)
 
 export default {
 	input: `index.js`,
-	name: `deepmerge`,
 	plugins: [
 		commonjs(),
 		resolve(),
 	],
 	output: [
-		{ file: pkg.main, format: `umd` },
+		{
+			name: 'deepmerge',
+			file: pkg.main,
+			format: `umd`
+		},
 	],
 }
diff --git a/test/custom-array-merge.js b/test/custom-array-merge.js
index 5dbb61c..a15d96a 100644
--- a/test/custom-array-merge.js
+++ b/test/custom-array-merge.js
@@ -1,5 +1,5 @@
 var merge = require('../')
-var test = require('tap').test
+var test = require('tape')
 
 test('custom merge array', function(t) {
 	var mergeFunctionCalled = false
diff --git a/test/custom-is-mergeable-object.js b/test/custom-is-mergeable-object.js
index efe4d4f..ea247ab 100644
--- a/test/custom-is-mergeable-object.js
+++ b/test/custom-is-mergeable-object.js
@@ -1,5 +1,5 @@
 var merge = require('../')
-var test = require('tap').test
+var test = require('tape')
 
 test('isMergeableObject function copying object over object', function(t) {
 	var src = { key: { isMergeable: false }, baz: 'yes' }
diff --git a/test/merge-all.js b/test/merge-all.js
index 5d64bd4..4627e77 100644
--- a/test/merge-all.js
+++ b/test/merge-all.js
@@ -1,5 +1,5 @@
 var merge = require('../')
-var test = require('tap').test
+var test = require('tape')
 
 test('throw error if first argument is not an array', function(t) {
 	t.throws(merge.all.bind(null, { example: true }, { another: '2' }), Error)
diff --git a/test/merge.js b/test/merge.js
index bb14403..21a68e2 100644
--- a/test/merge.js
+++ b/test/merge.js
@@ -1,5 +1,5 @@
 var merge = require('../')
-var test = require('tap').test
+var test = require('tape')
 
 test('add keys in target that do not exist at the root', function(t) {
 	var src = { key1: 'value1', key2: 'value2' }
@@ -449,7 +449,7 @@ test('should overwrite values when property is initialised but undefined', funct
 
 	function hasUndefinedProperty(o) {
 		t.ok(o.hasOwnProperty('value'))
-		t.type(o.value, 'undefined')
+		t.equal(typeof o.value, 'undefined')
 	}
 
 	hasUndefinedProperty(merge(target1, src))