diff --git a/package-lock.json b/package-lock.json
index 236e80c..1ea930b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,125 @@
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     },
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@@ -507,21 +815,13 @@
       "dev": true
     },
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+      "version": "0.5.19",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.19.tgz",
+      "integrity": "sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==",
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-          "dev": true
-        }
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     },
     "sourcemap-codec": {
@@ -531,65 +831,84 @@
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-      "integrity": "sha1-0E3iyJ4Tf019IG8Ia17S+ua+jOo=",
+      "version": "1.2.2",
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       "dev": true,
       "requires": {
-        "define-properties": "^1.1.2",
-        "es-abstract": "^1.5.0",
-        "function-bind": "^1.0.2"
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.18.0-next.0"
       }
     },
-    "string.prototype.trimleft": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.0.tgz",
-      "integrity": "sha512-FJ6b7EgdKxxbDxc79cOlok6Afd++TTs5szo+zJTUyow3ycrRfJVE2pq3vcN53XexvKZu/DJMDfeI/qMiZTrjTw==",
+    "string.prototype.trimend": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimend/-/string.prototype.trimend-1.0.2.tgz",
+      "integrity": "sha512-8oAG/hi14Z4nOVP0z6mdiVZ/wqjDtWSLygMigTzAb+7aPEDTleeFf+WrF+alzecxIRkckkJVn+dTlwzJXORATw==",
       "dev": true,
       "requires": {
         "define-properties": "^1.1.3",
-        "function-bind": "^1.1.1"
+        "es-abstract": "^1.18.0-next.1"
       }
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-    "string.prototype.trimright": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.0.tgz",
-      "integrity": "sha512-fXZTSV55dNBwv16uw+hh5jkghxSnc5oHq+5K/gXgizHwAvMetdAJlHqqoFC1FSDVPYWLkAKl2cxpUT41sV7nSg==",
+    "string.prototype.trimstart": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimstart/-/string.prototype.trimstart-1.0.2.tgz",
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       "dev": true,
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         "define-properties": "^1.1.3",
-        "function-bind": "^1.1.1"
+        "es-abstract": "^1.18.0-next.1"
       }
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     "tape": {
-      "version": "4.11.0",
-      "resolved": "https://registry.npmjs.org/tape/-/tape-4.11.0.tgz",
-      "integrity": "sha512-yixvDMX7q7JIs/omJSzSZrqulOV51EC9dK8dM0TzImTIkHWfe2/kFyL5v+d9C+SrCMaICk59ujsqFAVidDqDaA==",
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-      "requires": {
-        "deep-equal": "~1.0.1",
-        "defined": "~1.0.0",
-        "for-each": "~0.3.3",
-        "function-bind": "~1.1.1",
-        "glob": "~7.1.4",
-        "has": "~1.0.3",
-        "inherits": "~2.0.4",
-        "minimist": "~1.2.0",
-        "object-inspect": "~1.6.0",
-        "resolve": "~1.11.1",
-        "resumer": "~0.0.0",
-        "string.prototype.trim": "~1.1.2",
-        "through": "~2.3.8"
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/tape/-/tape-5.0.1.tgz",
+      "integrity": "sha512-wVsOl2shKPcjdJdc8a+PwacvrOdJZJ57cLUXlxW4TQ2R6aihXwG0m0bKm4mA4wjtQNTaLMCrYNEb4f9fjHKUYQ==",
+      "dev": true,
+      "requires": {
+        "deep-equal": "^2.0.3",
+        "defined": "^1.0.0",
+        "dotignore": "^0.1.2",
+        "for-each": "^0.3.3",
+        "function-bind": "^1.1.1",
+        "glob": "^7.1.6",
+        "has": "^1.0.3",
+        "inherits": "^2.0.4",
+        "is-regex": "^1.0.5",
+        "minimist": "^1.2.5",
+        "object-inspect": "^1.7.0",
+        "object-is": "^1.1.2",
+        "object.assign": "^4.1.0",
+        "resolve": "^1.17.0",
+        "resumer": "^0.0.0",
+        "string.prototype.trim": "^1.2.1",
+        "through": "^2.3.8"
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-          "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.11.1.tgz",
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-          "dev": true,
-          "requires": {
-            "path-parse": "^1.0.6"
-          }
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
+          "dev": true
+        }
+      }
+    },
+    "terser": {
+      "version": "5.5.1",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.5.1.tgz",
+      "integrity": "sha512-6VGWZNVP2KTUcltUQJ25TtNjx/XgdDsBDKGt8nN0MpydU36LmbPPcMBd2kmtZNNGVVDLg44k7GKeHHj+4zPIBQ==",
+      "dev": true,
+      "requires": {
+        "commander": "^2.20.0",
+        "source-map": "~0.7.2",
+        "source-map-support": "~0.5.19"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.7.3",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.3.tgz",
+          "integrity": "sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==",
+          "dev": true
         }
       }
     },
@@ -600,27 +919,16 @@
       "dev": true
     },
     "ts-node": {
-      "version": "7.0.1",
-      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-7.0.1.tgz",
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+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-9.0.0.tgz",
+      "integrity": "sha512-/TqB4SnererCDR/vb4S/QvSZvzQMJN8daAslg7MeaiHvD8rDZsSfXmNeNumyZZzMned72Xoq/isQljYSt8Ynfg==",
       "dev": true,
       "requires": {
-        "arrify": "^1.0.0",
-        "buffer-from": "^1.1.0",
-        "diff": "^3.1.0",
+        "arg": "^4.1.0",
+        "diff": "^4.0.1",
         "make-error": "^1.1.1",
-        "minimist": "^1.2.0",
-        "mkdirp": "^0.5.1",
-        "source-map-support": "^0.5.6",
-        "yn": "^2.0.0"
-      },
-      "dependencies": {
-        "diff": {
-          "version": "3.5.0",
-          "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
-          "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
-          "dev": true
-        }
+        "source-map-support": "^0.5.17",
+        "yn": "3.1.1"
       }
     },
     "type-check": {
@@ -633,26 +941,76 @@
       }
     },
     "typescript": {
-      "version": "2.2.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.2.2.tgz",
-      "integrity": "sha1-YGAiUIR5tV/6NotY/uljoD39eww=",
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.1.2.tgz",
+      "integrity": "sha512-thGloWsGH3SOxv1SoY7QojKi0tc+8FnOmiarEGMbd/lar7QOEd3hvlx3Fp5y6FlDUGl9L+pd4n2e+oToGMmhRQ==",
       "dev": true
     },
-    "uglify-js": {
-      "version": "3.6.1",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.1.tgz",
-      "integrity": "sha512-+dSJLJpXBb6oMHP+Yvw8hUgElz4gLTh82XuX68QiJVTXaE5ibl6buzhNkQdYhBlIhozWOC9ge16wyRmjG4TwVQ==",
-      "dev": true,
-      "requires": {
-        "commander": "2.20.0",
-        "source-map": "~0.6.1"
-      }
-    },
     "v8-argv": {
       "version": "github:jkroso/v8-argv#284f84379e292eb956a5e7b66fb953ec4974385e",
       "from": "github:jkroso/v8-argv#1.1.1",
       "dev": true
     },
+    "which-boxed-primitive": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/which-boxed-primitive/-/which-boxed-primitive-1.0.1.tgz",
+      "integrity": "sha512-7BT4TwISdDGBgaemWU0N0OU7FeAEJ9Oo2P1PHRm/FCWoEi2VLWC9b6xvxAA3C/NMpxg3HXVgi0sMmGbNUbNepQ==",
+      "dev": true,
+      "requires": {
+        "is-bigint": "^1.0.0",
+        "is-boolean-object": "^1.0.0",
+        "is-number-object": "^1.0.3",
+        "is-string": "^1.0.4",
+        "is-symbol": "^1.0.2"
+      }
+    },
+    "which-collection": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/which-collection/-/which-collection-1.0.1.tgz",
+      "integrity": "sha512-W8xeTUwaln8i3K/cY1nGXzdnVZlidBcagyNFtBdD5kxnb4TvGKR7FfSIS3mYpwWS1QUCutfKz8IY8RjftB0+1A==",
+      "dev": true,
+      "requires": {
+        "is-map": "^2.0.1",
+        "is-set": "^2.0.1",
+        "is-weakmap": "^2.0.1",
+        "is-weakset": "^2.0.1"
+      }
+    },
+    "which-typed-array": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.2.tgz",
+      "integrity": "sha512-KT6okrd1tE6JdZAy3o2VhMoYPh3+J6EMZLyrxBQsZflI1QCZIxMrIYLkosd8Twf+YfknVIHmYQPgJt238p8dnQ==",
+      "dev": true,
+      "requires": {
+        "available-typed-arrays": "^1.0.2",
+        "es-abstract": "^1.17.5",
+        "foreach": "^2.0.5",
+        "function-bind": "^1.1.1",
+        "has-symbols": "^1.0.1",
+        "is-typed-array": "^1.1.3"
+      },
+      "dependencies": {
+        "es-abstract": {
+          "version": "1.17.7",
+          "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.7.tgz",
+          "integrity": "sha512-VBl/gnfcJ7OercKA9MVaegWsBHFjV492syMudcnQZvt/Dw8ezpcOHYZXa/J96O8vx+g4x65YKhxOwDUh63aS5g==",
+          "dev": true,
+          "requires": {
+            "es-to-primitive": "^1.2.1",
+            "function-bind": "^1.1.1",
+            "has": "^1.0.3",
+            "has-symbols": "^1.0.1",
+            "is-callable": "^1.2.2",
+            "is-regex": "^1.1.1",
+            "object-inspect": "^1.8.0",
+            "object-keys": "^1.1.1",
+            "object.assign": "^4.1.1",
+            "string.prototype.trimend": "^1.0.1",
+            "string.prototype.trimstart": "^1.0.1"
+          }
+        }
+      }
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -666,9 +1024,9 @@
       "dev": true
     },
     "yn": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
-      "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo=",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
       "dev": true
     }
   }
diff --git a/package.json b/package.json
index 7ef1abb..331b1d3 100644
--- a/package.json
+++ b/package.json
@@ -26,23 +26,23 @@
   ],
   "scripts": {
     "build": "rollup -c",
-    "size": "npm run build && uglifyjs --compress --mangle -- ./dist/umd.js | gzip -c | wc -c",
+    "size": "npm run build && terser --compress --mangle -- ./dist/umd.js | gzip -c | wc -c",
     "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"
   },
   "dependencies": {},
   "devDependencies": {
+    "@rollup/plugin-commonjs": "^16.0.0",
+    "@rollup/plugin-node-resolve": "^10.0.0",
     "@types/node": "^8.10.54",
     "is-mergeable-object": "1.1.0",
-    "is-plain-obj": "^2.0.0",
+    "is-plain-obj": "^3.0.0",
     "jsmd": "^1.0.2",
-    "rollup": "^1.23.1",
-    "rollup-plugin-commonjs": "^10.1.0",
-    "rollup-plugin-node-resolve": "^5.2.0",
-    "tape": "^4.11.0",
-    "ts-node": "7.0.1",
-    "typescript": "=2.2.2",
-    "uglify-js": "^3.6.1"
+    "rollup": "^2.33.1",
+    "tape": "^5.0.1",
+    "terser": "^5.5.1",
+    "ts-node": "^9.0.0",
+    "typescript": "^4.1.2"
   },
   "engines": {
     "node": ">=10"
diff --git a/readme.md b/readme.md
index 90dfc51..35ecc3a 100644
--- a/readme.md
+++ b/readme.md
@@ -2,7 +2,7 @@
 
 Merges the enumerable properties of two or more objects deeply.
 
-> UMD bundle is 723B minified+gzipped
+> UMD bundle is 718B minified+gzipped
 
 ## Getting Started
 
diff --git a/rollup.config.js b/rollup.config.js
index 8323ab2..7ce9d62 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,5 +1,7 @@
-import resolve from 'rollup-plugin-node-resolve'
-import commonjs from 'rollup-plugin-commonjs'
+// @ts-check
+
+import resolve from '@rollup/plugin-node-resolve'
+import commonjs from '@rollup/plugin-commonjs'
 import pkg from './package.json'
 
 export default {