diff --git a/node_modules/.package-lock.json b/node_modules/.package-lock.json
new file mode 100644
index 00000000..81a3415f
--- /dev/null
+++ b/node_modules/.package-lock.json
@@ -0,0 +1,267 @@
+{
+  "name": "action-send-mail",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "node_modules/@actions/core": {
+      "version": "1.2.6",
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+      "engines": {
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+    "node_modules/ansi-styles": {
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+      "engines": {
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+      }
+    },
+    "node_modules/cliui": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
+      "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
+      "dependencies": {
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+        "strip-ansi": "^5.2.0",
+        "wrap-ansi": "^5.1.0"
+      }
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+    "node_modules/color-convert": {
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+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
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+      }
+    },
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+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
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+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+      "engines": {
+        "node": ">=0.10.0"
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+    },
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+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+      "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
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+      },
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+      }
+    },
+    "node_modules/get-caller-file": {
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+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+      "engines": {
+        "node": "6.* || 8.* || >= 10.*"
+      }
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+      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+      "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+      "engines": {
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+      "dependencies": {
+        "p-locate": "^3.0.0",
+        "path-exists": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/nodemailer": {
+      "version": "6.4.17",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.4.17.tgz",
+      "integrity": "sha512-89ps+SBGpo0D4Bi5ZrxcrCiRFaMmkCt+gItMXQGzEtZVR3uAD3QAQIDoxTWnx3ky0Dwwy/dhFrQ+6NNGXpw/qQ==",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/p-limit": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+      "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+      "dependencies": {
+        "p-try": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/p-locate": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+      "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+      "dependencies": {
+        "p-limit": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/p-try": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+      "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/path-exists": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+      "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+      "engines": {
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+      }
+    },
+    "node_modules/require-directory": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
+      "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I=",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/require-main-filename": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+      "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg=="
+    },
+    "node_modules/set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc="
+    },
+    "node_modules/showdown": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/showdown/-/showdown-1.9.1.tgz",
+      "integrity": "sha512-9cGuS382HcvExtf5AHk7Cb4pAeQQ+h0eTr33V1mu+crYWV4KvWAw6el92bDrqGEk5d46Ai/fhbEUwqJ/mTCNEA==",
+      "dependencies": {
+        "yargs": "^14.2"
+      },
+      "bin": {
+        "showdown": "bin/showdown.js"
+      }
+    },
+    "node_modules/string-width": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+      "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+      "dependencies": {
+        "emoji-regex": "^7.0.1",
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^5.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/strip-ansi": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+      "dependencies": {
+        "ansi-regex": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
+    },
+    "node_modules/wrap-ansi": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+      "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+      "dependencies": {
+        "ansi-styles": "^3.2.0",
+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/y18n": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
+      "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ=="
+    },
+    "node_modules/yargs": {
+      "version": "14.2.3",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.3.tgz",
+      "integrity": "sha512-ZbotRWhF+lkjijC/VhmOT9wSgyBQ7+zr13+YLkhfsSiTriYsMzkTUFP18pFhWwBeMa5gUc1MzbhrO6/VB7c9Xg==",
+      "dependencies": {
+        "cliui": "^5.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^15.0.1"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "15.0.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.1.tgz",
+      "integrity": "sha512-0OAMV2mAZQrs3FkNpDQcBk1x5HXb8X4twADss4S0Iuk+2dGnLOE/fRHrsYm542GduMveyA77OF4wrNJuanRCWw==",
+      "dependencies": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    }
+  }
+}
diff --git a/node_modules/nodemailer/CHANGELOG.md b/node_modules/nodemailer/CHANGELOG.md
index dd70c91f..b303782b 100644
--- a/node_modules/nodemailer/CHANGELOG.md
+++ b/node_modules/nodemailer/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## 6.4.17 2020-12-11
+
+-   Allow mixing attachments with caendar alternatives
+
 ## 6.4.16 2020-11-12
 
 -   Applied updated prettier formating rules
diff --git a/node_modules/nodemailer/lib/mail-composer/index.js b/node_modules/nodemailer/lib/mail-composer/index.js
index 08121c4f..e47c40c2 100644
--- a/node_modules/nodemailer/lib/mail-composer/index.js
+++ b/node_modules/nodemailer/lib/mail-composer/index.js
@@ -230,9 +230,8 @@ class MailComposer {
             amp.contentType = 'text/x-amp-html; charset=utf-8';
         }
 
-        // only include the calendar alternative if there are no attachments
-        // otherwise you might end up in a blank screen on some clients
-        if (this.mail.icalEvent && !(this.mail.attachments && this.mail.attachments.length)) {
+        // NB! when including attachments with a calendar alternative you might end up in a blank screen on some clients
+        if (this.mail.icalEvent) {
             if (
                 typeof this.mail.icalEvent === 'object' &&
                 (this.mail.icalEvent.content || this.mail.icalEvent.path || this.mail.icalEvent.href || this.mail.icalEvent.raw)
diff --git a/node_modules/nodemailer/package.json b/node_modules/nodemailer/package.json
index 6e0a3893..d5a69bed 100644
--- a/node_modules/nodemailer/package.json
+++ b/node_modules/nodemailer/package.json
@@ -1,73 +1,45 @@
 {
-  "_from": "nodemailer@6.4.16",
-  "_id": "nodemailer@6.4.16",
-  "_inBundle": false,
-  "_integrity": "sha512-68K0LgZ6hmZ7PVmwL78gzNdjpj5viqBdFqKrTtr9bZbJYj6BRj5W6WGkxXrEnUl3Co3CBXi3CZBUlpV/foGnOQ==",
-  "_location": "/nodemailer",
-  "_phantomChildren": {},
-  "_requested": {
-    "type": "version",
-    "registry": true,
-    "raw": "nodemailer@6.4.16",
     "name": "nodemailer",
-    "escapedName": "nodemailer",
-    "rawSpec": "6.4.16",
-    "saveSpec": null,
-    "fetchSpec": "6.4.16"
-  },
-  "_requiredBy": [
-    "#USER",
-    "/"
-  ],
-  "_resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.4.16.tgz",
-  "_shasum": "5cb6391b1d79ab7eff32d6f9f48366b5a7117293",
-  "_spec": "nodemailer@6.4.16",
-  "_where": "/home/dawidd6/github/dawidd6/action-send-mail",
-  "author": {
-    "name": "Andris Reinman"
-  },
-  "bugs": {
-    "url": "https://github.com/nodemailer/nodemailer/issues"
-  },
-  "bundleDependencies": false,
-  "dependencies": {},
-  "deprecated": false,
-  "description": "Easy as cake e-mail sending from your Node.js applications",
-  "devDependencies": {
-    "bunyan": "1.8.14",
-    "chai": "4.2.0",
-    "eslint-config-nodemailer": "1.2.0",
-    "eslint-config-prettier": "6.15.0",
-    "grunt": "1.3.0",
-    "grunt-cli": "1.3.2",
-    "grunt-eslint": "23.0.0",
-    "grunt-mocha-test": "0.13.3",
-    "libbase64": "1.2.1",
-    "libmime": "5.0.0",
-    "libqp": "1.1.0",
-    "mocha": "8.2.1",
-    "nodemailer-ntlm-auth": "1.0.1",
-    "proxy": "1.0.2",
-    "proxy-test-server": "1.0.0",
-    "sinon": "9.2.1",
-    "smtp-server": "3.7.0"
-  },
-  "engines": {
-    "node": ">=6.0.0"
-  },
-  "homepage": "https://nodemailer.com/",
-  "keywords": [
-    "Nodemailer"
-  ],
-  "license": "MIT",
-  "main": "lib/nodemailer.js",
-  "name": "nodemailer",
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/nodemailer/nodemailer.git"
-  },
-  "scripts": {
-    "test": "grunt"
-  },
-  "version": "6.4.16"
+    "version": "6.4.17",
+    "description": "Easy as cake e-mail sending from your Node.js applications",
+    "main": "lib/nodemailer.js",
+    "scripts": {
+        "test": "grunt"
+    },
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/nodemailer/nodemailer.git"
+    },
+    "keywords": [
+        "Nodemailer"
+    ],
+    "author": "Andris Reinman",
+    "license": "MIT",
+    "bugs": {
+        "url": "https://github.com/nodemailer/nodemailer/issues"
+    },
+    "homepage": "https://nodemailer.com/",
+    "devDependencies": {
+        "bunyan": "1.8.14",
+        "chai": "4.2.0",
+        "eslint-config-nodemailer": "1.2.0",
+        "eslint-config-prettier": "7.0.0",
+        "grunt": "1.3.0",
+        "grunt-cli": "1.3.2",
+        "grunt-eslint": "23.0.0",
+        "grunt-mocha-test": "0.13.3",
+        "libbase64": "1.2.1",
+        "libmime": "5.0.0",
+        "libqp": "1.1.0",
+        "mocha": "8.2.1",
+        "nodemailer-ntlm-auth": "1.0.1",
+        "proxy": "1.0.2",
+        "proxy-test-server": "1.0.0",
+        "sinon": "9.2.1",
+        "smtp-server": "3.8.0"
+    },
+    "engines": {
+        "node": ">=6.0.0"
+    },
+    "dependencies": {}
 }
diff --git a/node_modules/y18n/CHANGELOG.md b/node_modules/y18n/CHANGELOG.md
index c259076a..a3d5bcd5 100644
--- a/node_modules/y18n/CHANGELOG.md
+++ b/node_modules/y18n/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+
+### 4.0.1 (2020-11-30)
+
+### Bug Fixes
+
+* address prototype pollution issue ([#108](https://www.github.com/yargs/y18n/issues/108)) ([a9ac604](https://www.github.com/yargs/y18n/commit/a9ac604abf756dec9687be3843e2c93bfe581f25))
+
 <a name="4.0.0"></a>
 # [4.0.0](https://github.com/yargs/y18n/compare/v3.2.1...v4.0.0) (2017-10-10)
 
diff --git a/node_modules/y18n/index.js b/node_modules/y18n/index.js
index d7206816..727362aa 100644
--- a/node_modules/y18n/index.js
+++ b/node_modules/y18n/index.js
@@ -11,7 +11,7 @@ function Y18N (opts) {
   this.fallbackToLanguage = typeof opts.fallbackToLanguage === 'boolean' ? opts.fallbackToLanguage : true
 
   // internal stuff.
-  this.cache = {}
+  this.cache = Object.create(null)
   this.writeQueue = []
 }
 
diff --git a/node_modules/y18n/package.json b/node_modules/y18n/package.json
index 9ee39d80..2050c9e6 100644
--- a/node_modules/y18n/package.json
+++ b/node_modules/y18n/package.json
@@ -1,37 +1,32 @@
 {
-  "_from": "y18n@^4.0.0",
-  "_id": "y18n@4.0.0",
-  "_inBundle": false,
-  "_integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
-  "_location": "/y18n",
-  "_phantomChildren": {},
-  "_requested": {
-    "type": "range",
-    "registry": true,
-    "raw": "y18n@^4.0.0",
-    "name": "y18n",
-    "escapedName": "y18n",
-    "rawSpec": "^4.0.0",
-    "saveSpec": null,
-    "fetchSpec": "^4.0.0"
+  "name": "y18n",
+  "version": "4.0.1",
+  "description": "the bare-bones internationalization library used by yargs",
+  "main": "index.js",
+  "scripts": {
+    "pretest": "standard",
+    "test": "nyc mocha",
+    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "release": "standard-version"
   },
-  "_requiredBy": [
-    "/yargs"
+  "repository": {
+    "type": "git",
+    "url": "git@github.com:yargs/y18n.git"
+  },
+  "files": [
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   ],
-  "_resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-  "_shasum": "95ef94f85ecc81d007c264e190a120f0a3c8566b",
-  "_spec": "y18n@^4.0.0",
-  "_where": "/Users/dougpa/action-send-mail/node_modules/yargs",
-  "author": {
-    "name": "Ben Coe",
-    "email": "ben@npmjs.com"
-  },
+  "keywords": [
+    "i18n",
+    "internationalization",
+    "yargs"
+  ],
+  "author": "Ben Coe <ben@npmjs.com>",
+  "license": "ISC",
   "bugs": {
     "url": "https://github.com/yargs/y18n/issues"
   },
-  "bundleDependencies": false,
-  "deprecated": false,
-  "description": "the bare-bones internationalization library used by yargs",
+  "homepage": "https://github.com/yargs/y18n",
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     "coveralls": "^3.0.0",
@@ -40,28 +35,5 @@
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-  "homepage": "https://github.com/yargs/y18n",
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-    "i18n",
-    "internationalization",
-    "yargs"
-  ],
-  "license": "ISC",
-  "main": "index.js",
-  "name": "y18n",
-  "repository": {
-    "type": "git",
-    "url": "git+ssh://git@github.com/yargs/y18n.git"
-  },
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-    "pretest": "standard",
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-    "test": "nyc mocha"
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 }
diff --git a/package-lock.json b/package-lock.json
index 58534ea3..7d6922f1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,8 +1,278 @@
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+      "dependencies": {
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+        "strip-ansi": "^5.0.0"
+      },
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+    },
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+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.3.tgz",
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+      "dependencies": {
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+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^15.0.1"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "15.0.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.1.tgz",
+      "integrity": "sha512-0OAMV2mAZQrs3FkNpDQcBk1x5HXb8X4twADss4S0Iuk+2dGnLOE/fRHrsYm542GduMveyA77OF4wrNJuanRCWw==",
+      "dependencies": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    }
+  },
   "dependencies": {
     "@actions/core": {
       "version": "1.2.6",
@@ -175,9 +445,9 @@
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-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
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+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
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     "yargs": {
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