diff --git a/package-lock.json b/package-lock.json
index a91adf94..ed6a31ea 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -749,20 +806,6 @@
         "quick-lru": "^4.0.1"
       }
     },
-    "chai": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/chai/-/chai-4.2.0.tgz",
-      "integrity": "sha512-XQU3bhBukrOsQCuwZndwGcCVQHyZi53fQ6Ys1Fym7E4olpIqqZZhhoFJoaKVvV17lWQoXYwgWN2nF5crA8J2jw==",
-      "dev": true,
-      "requires": {
-        "assertion-error": "^1.1.0",
-        "check-error": "^1.0.2",
-        "deep-eql": "^3.0.1",
-        "get-func-name": "^2.0.0",
-        "pathval": "^1.1.0",
-        "type-detect": "^4.0.5"
-      }
-    },
     "chalk": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
@@ -777,12 +820,6 @@
       "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA=="
     },
-    "check-error": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
-      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
-      "dev": true
-    },
     "chokidar": {
       "version": "3.4.2",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.4.2.tgz",
@@ -823,14 +860,14 @@
       "integrity": "sha512-FxqpkPPwu1HjuN93Omfm4h8uIanXofW0RxVEW3k5RKx+mJJYSthzNhp32Kzxxy3YAEZ/Dc/EWN1vZRY0+kOhbw=="
     },
     "cliui": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-6.0.0.tgz",
-      "integrity": "sha512-t6wbgtoCXvAzst7QgXxJYqPt0usEfbgQdftEPbLL/cvv6HPE5VgvqCuAIDR0NgU52ds6rFwqrgakNLrHEjCbrQ==",
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.1.tgz",
+      "integrity": "sha512-rcvHOWyGyid6I1WjT/3NatKj2kDt9OdSHSXpyLXaMWFbKpGACNW8pRhhdPUq9MWUOdwn8Rz9AVETjF4105rZZQ==",
       "dev": true,
       "requires": {
         "string-width": "^4.2.0",
         "strip-ansi": "^6.0.0",
-        "wrap-ansi": "^6.2.0"
+        "wrap-ansi": "^7.0.0"
       },
       "dependencies": {
         "emoji-regex": {
@@ -983,15 +1020,6 @@
         "mimic-response": "^1.0.0"
       }
     },
-    "deep-eql": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-3.0.1.tgz",
-      "integrity": "sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==",
-      "dev": true,
-      "requires": {
-        "type-detect": "^4.0.0"
-      }
-    },
     "deep-extend": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
@@ -1131,6 +1159,12 @@
         "is-symbol": "^1.0.2"
       }
     },
+    "escalade": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.0.tgz",
+      "integrity": "sha512-mAk+hPSO8fLDkhV7V0dXazH5pDc6MrjBTPyD3VeKzxnVFjH1MIxbCdqGZB9O8+EwWakZs3ZCbDS4IpRt79V1ig==",
+      "dev": true
+    },
     "escape-goat": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/escape-goat/-/escape-goat-2.1.1.tgz",
@@ -1142,21 +1176,22 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
     },
     "eslint": {
-      "version": "7.7.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.7.0.tgz",
-      "integrity": "sha512-1KUxLzos0ZVsyL81PnRN335nDtQ8/vZUD6uMtWbF+5zDtjKcsklIi78XoE0MVL93QvWTu+E5y44VyyCsOMBrIg==",
+      "version": "7.10.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.10.0.tgz",
+      "integrity": "sha512-BDVffmqWl7JJXqCjAK6lWtcQThZB/aP1HXSH1JKwGwv0LQEdvpR7qzNrUT487RM39B5goWuboFad5ovMBmD8yA==",
       "requires": {
         "@babel/code-frame": "^7.0.0",
+        "@eslint/eslintrc": "^0.1.3",
         "ajv": "^6.10.0",
         "chalk": "^4.0.0",
         "cross-spawn": "^7.0.2",
         "debug": "^4.0.1",
         "doctrine": "^3.0.0",
         "enquirer": "^2.3.5",
-        "eslint-scope": "^5.1.0",
+        "eslint-scope": "^5.1.1",
         "eslint-utils": "^2.1.0",
         "eslint-visitor-keys": "^1.3.0",
-        "espree": "^7.2.0",
+        "espree": "^7.3.0",
         "esquery": "^1.2.0",
         "esutils": "^2.0.2",
         "file-entry-cache": "^5.0.1",
@@ -1182,12 +1217,19 @@
         "table": "^5.2.3",
         "text-table": "^0.2.0",
         "v8-compile-cache": "^2.0.3"
+      },
+      "dependencies": {
+        "ignore": {
+          "version": "4.0.6",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
+          "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg=="
+        }
       }
     },
     "eslint-config-prettier": {
-      "version": "6.11.0",
-      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-6.11.0.tgz",
-      "integrity": "sha512-oB8cpLWSAjOVFEJhhyMZh6NOEOtBVziaqdDQ86+qhDHFbZXoRTM7pNSvFRfW/W/L/LrQ38C99J5CGuRBBzBsdA==",
+      "version": "6.12.0",
+      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-6.12.0.tgz",
+      "integrity": "sha512-9jWPlFlgNwRUYVoujvWTQ1aMO8o6648r+K7qU7K5Jmkbyqav1fuEZC0COYpGBxyiAJb65Ra9hrmFx19xRGwXWw==",
       "requires": {
         "get-stdin": "^6.0.0"
       }
@@ -1235,11 +1277,11 @@
       }
     },
     "eslint-scope": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.1.0.tgz",
-      "integrity": "sha512-iiGRvtxWqgtx5m8EyQUJihBloE4EnYeGE/bz1wSPwJE6tZuJUtHlhqDM4Xj2ukE8Dyy1+HCZ4hE0fzIVMzb58w==",
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.1.1.tgz",
+      "integrity": "sha512-2NxwbF/hZ0KpepYN0cNbo+FN6XoK7GaHlQhgx/hIZl6Va0bF45RQOOwhLIy8lQDbuCiadSLCBnH2CFYquit5bw==",
       "requires": {
-        "esrecurse": "^4.1.0",
+        "esrecurse": "^4.3.0",
         "estraverse": "^4.1.1"
       }
     },
@@ -1287,11 +1329,18 @@
       }
     },
     "esrecurse": {
-      "version": "4.2.1",
-      "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.2.1.tgz",
-      "integrity": "sha512-64RBB++fIOAXPw3P9cy89qfMlvZEXZkqqJkjqqXIvzP5ezRZjW+lPWjw35UX/3EhUPFYbg5ER4JYgDw4007/DQ==",
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.3.0.tgz",
+      "integrity": "sha512-KmfKL3b6G+RXvP8N1vr3Tq1kL/oCFgn2NYXEtqP8/L3pKapUA4G8cFVaoF3SU323CD4XypR/ffioHmkti6/Tag==",
       "requires": {
-        "estraverse": "^4.1.0"
+        "estraverse": "^5.2.0"
+      },
+      "dependencies": {
+        "estraverse": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.2.0.tgz",
+          "integrity": "sha512-BxbNGGNm0RyRYvUdHpIwv9IWzeM9XClbOxwoATuFdOE7ZE6wHL+HQ5T8hoPM+zHvmKzzsEqhgy0GrQ5X13afiQ=="
+        }
       }
     },
     "estraverse": {
@@ -1546,12 +1595,6 @@
       "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
       "dev": true
     },
-    "get-func-name": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.0.tgz",
-      "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=",
-      "dev": true
-    },
     "get-stdin": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-6.0.0.tgz",
@@ -1613,13 +1656,6 @@
         "ignore": "^5.1.4",
         "merge2": "^1.3.0",
         "slash": "^3.0.0"
-      },
-      "dependencies": {
-        "ignore": {
-          "version": "5.1.8",
-          "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.1.8.tgz",
-          "integrity": "sha512-BMpfD7PpiETpBl/A6S498BaIJ6Y/ABT93ETbby2fP00v4EbvPBXWEoaR1UBPKs3iR53pJY7EtZk5KACI57i1Uw=="
-        }
       }
     },
     "got": {
@@ -1756,9 +1792,9 @@
       }
     },
     "ignore": {
-      "version": "4.0.6",
-      "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
-      "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg=="
+      "version": "5.1.8",
+      "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.1.8.tgz",
+      "integrity": "sha512-BMpfD7PpiETpBl/A6S498BaIJ6Y/ABT93ETbby2fP00v4EbvPBXWEoaR1UBPKs3iR53pJY7EtZk5KACI57i1Uw=="
     },
     "ignore-walk": {
       "version": "3.0.3",
@@ -2613,9 +2649,9 @@
       }
     },
     "node-fetch": {
-      "version": "2.6.0",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.0.tgz",
-      "integrity": "sha512-8dG4H5ujfvFiqDmVu9fQ5bOHUC15JMjMY/Zumv26oOvvVJjM67KF8koCWIabKQ1GJIa9r2mMZscBq/TbdOcmNA==",
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.1.tgz",
+      "integrity": "sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw==",
       "dev": true
     },
     "normalize-package-data": {
@@ -2840,12 +2876,6 @@
       "resolved": "https://registry.npmjs.org/path-type/-/path-type-4.0.0.tgz",
       "integrity": "sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw=="
     },
-    "pathval": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.0.tgz",
-      "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA=",
-      "dev": true
-    },
     "picomatch": {
       "version": "2.2.2",
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.2.2.tgz",
@@ -2868,9 +2898,9 @@
       "integrity": "sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc="
     },
     "prettier": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.1.1.tgz",
-      "integrity": "sha512-9bY+5ZWCfqj3ghYBLxApy2zf6m+NJo5GzmLTpr9FsApsfjriNnS2dahWReHMi7qNPhhHl9SYHJs2cHZLgexNIw=="
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.1.2.tgz",
+      "integrity": "sha512-16c7K+x4qVlJg9rEbXl7HEGmQyZlG4R9AgP+oHKRMsMsuk8s+ATStlf1NpDqyBI1HpVyfjLOeMhH2LvuNvV5Vg=="
     },
     "prettier-linter-helpers": {
       "version": "1.0.0",
@@ -3488,9 +3518,9 @@
       }
     },
     "typescript": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.2.tgz",
-      "integrity": "sha512-e4ERvRV2wb+rRZ/IQeb3jm2VxBsirQLpQhdxplZ2MEzGvDkkMmPglecnNDfSUBivMjP93vRbngYYDQqQ/78bcQ==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.3.tgz",
+      "integrity": "sha512-tEu6DGxGgRJPb/mVPIZ48e69xCn2yRmCgYmDugAVwmJ6o+0u1RI18eO7E7WBTLYLaEVVOhwQmcdhQHweux/WPg==",
       "dev": true
     },
     "unique-string": {
@@ -3692,9 +3722,9 @@
       "dev": true
     },
     "wrap-ansi": {
-      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
-      "integrity": "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
       "dev": true,
       "requires": {
         "ansi-styles": "^4.0.0",
@@ -3769,22 +3799,18 @@
       "dev": true
     },
     "yargs": {
-      "version": "15.4.1",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
-      "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
+      "version": "16.0.3",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.0.3.tgz",
+      "integrity": "sha512-6+nLw8xa9uK1BOEOykaiYAJVh6/CjxWXK/q9b5FpRgNslt8s22F2xMBqVIKgCRjNgGvGPBy8Vog7WN7yh4amtA==",
       "dev": true,
       "requires": {
-        "cliui": "^6.0.0",
-        "decamelize": "^1.2.0",
-        "find-up": "^4.1.0",
-        "get-caller-file": "^2.0.1",
+        "cliui": "^7.0.0",
+        "escalade": "^3.0.2",
+        "get-caller-file": "^2.0.5",
         "require-directory": "^2.1.1",
-        "require-main-filename": "^2.0.0",
-        "set-blocking": "^2.0.0",
         "string-width": "^4.2.0",
-        "which-module": "^2.0.0",
-        "y18n": "^4.0.0",
-        "yargs-parser": "^18.1.2"
+        "y18n": "^5.0.1",
+        "yargs-parser": "^20.0.0"
       },
       "dependencies": {
         "emoji-regex": {
@@ -3809,6 +3835,18 @@
             "is-fullwidth-code-point": "^3.0.0",
             "strip-ansi": "^6.0.0"
           }
+        },
+        "y18n": {
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.1.tgz",
+          "integrity": "sha512-/jJ831jEs4vGDbYPQp4yGKDYPSCCEQ45uZWJHE1AoYBzqdZi8+LDWas0z4HrmJXmKdpFsTiowSHXdxyFhpmdMg==",
+          "dev": true
+        },
+        "yargs-parser": {
+          "version": "20.2.0",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.0.tgz",
+          "integrity": "sha512-2agPoRFPoIcFzOIp6656gcvsg2ohtscpw2OINr/q46+Sq41xz2OYLqx5HRHabmFU1OARIPAYH5uteICE7mn/5A==",
+          "dev": true
         }
       }
     },
diff --git a/package.json b/package.json
index babe9ddd..5396121b 100644
--- a/package.json
+++ b/package.json
@@ -43,51 +43,49 @@
   "author": "Google Inc.",
   "license": "Apache-2.0",
   "dependencies": {
-    "@typescript-eslint/eslint-plugin": "^4.0.0",
-    "@typescript-eslint/parser": "^4.0.0",
+    "@typescript-eslint/eslint-plugin": "^4.2.0",
+    "@typescript-eslint/parser": "^4.2.0",
     "chalk": "^4.1.0",
-    "eslint": "^7.7.0",
-    "eslint-config-prettier": "^6.11.0",
+    "eslint": "^7.10.0",
+    "eslint-config-prettier": "^6.12.0",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^3.1.4",
     "execa": "^4.0.3",
     "inquirer": "^7.3.3",
-    "meow": "^7.1.0",
+    "meow": "^7.1.1",
     "ncp": "^2.0.0",
-    "prettier": "^2.0.5",
+    "prettier": "^2.1.2",
     "rimraf": "^3.0.2",
     "update-notifier": "^4.1.1",
     "write-file-atomic": "^3.0.3"
   },
   "devDependencies": {
     "@npm/types": "^1.0.1",
-    "@types/chai": "^4.2.12",
     "@types/cross-spawn": "^6.0.2",
-    "@types/eslint": "^7.2.0",
+    "@types/eslint": "^7.2.3",
     "@types/fs-extra": "^9.0.1",
     "@types/inquirer": "^7.3.1",
     "@types/mocha": "^8.0.3",
     "@types/ncp": "^2.0.4",
-    "@types/node": "^14.6.0",
-    "@types/prettier": "^2.0.2",
+    "@types/node": "^14.11.2",
+    "@types/prettier": "^2.1.1",
     "@types/rimraf": "^3.0.0",
-    "@types/sinon": "^9.0.4",
+    "@types/sinon": "^9.0.6",
     "@types/tmp": "^0.2.0",
     "@types/update-notifier": "^4.1.1",
     "@types/write-file-atomic": "^3.0.1",
-    "c8": "^7.3.0",
-    "chai": "^4.2.0",
+    "c8": "^7.3.1",
     "codecov": "^3.7.2",
     "cross-spawn": "^7.0.3",
     "fs-extra": "^9.0.1",
     "inline-fixtures": "^1.1.0",
     "js-green-licenses": "^2.0.1",
-    "mocha": "^8.1.1",
+    "mocha": "^8.1.3",
     "sinon": "^9.0.3",
     "tmp": "0.2.1",
-    "typescript": "^4.0.2"
+    "typescript": "^4.0.3"
   },
   "peerDependencies": {
-    "typescript": ">=3 <=4"
+    "typescript": ">=4"
   }
 }
diff --git a/test/fixtures/kitchen/package.json b/test/fixtures/kitchen/package.json
index eea2d9b0..a548edd6 100644
--- a/test/fixtures/kitchen/package.json
+++ b/test/fixtures/kitchen/package.json
@@ -2,7 +2,7 @@
   "name": "kitchen",
   "version": "1.0.0",
   "devDependencies": {
-    "typescript": "^2.4.2",
+    "typescript": "^4.0.3",
     "gts": "file:../gts.tgz"
   }
 }
diff --git a/test/kitchen.ts b/test/kitchen.ts
index bb38252e..956dc20c 100644
--- a/test/kitchen.ts
+++ b/test/kitchen.ts
@@ -2,7 +2,7 @@ import chalk = require('chalk');
 import * as cp from 'child_process';
 import * as fs from 'fs-extra';
 import * as tmp from 'tmp';
-import {assert} from 'chai';
+import * as assert from 'assert';
 import * as path from 'path';
 import {describe, it, before, after} from 'mocha';
 
@@ -145,7 +145,7 @@ describe('🚰 kitchen sink', () => {
       Object.assign({}, {reject: false}, execOpts)
     );
     assert.strictEqual(res.exitCode, 1);
-    assert.include(res.stdout, 'assigned a value but');
+    assert.ok(res.stdout.includes('assigned a value but'));
   });
 
   it('should fix', () => {