diff --git a/CHANGELOG.md b/CHANGELOG.md
index a32765ca..8cfa6638 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 6.3.1
+
+- fix #331 incorrect type on sourceData in simpleSitemapAndIndex.
+
 ## 6.3.0
 
 - simpleSitemap will create the dest directory if it doesn't exist
diff --git a/lib/sitemap-simple.ts b/lib/sitemap-simple.ts
index 66d88341..9939e45b 100644
--- a/lib/sitemap-simple.ts
+++ b/lib/sitemap-simple.ts
@@ -25,7 +25,7 @@ export const simpleSitemapAndIndex = async ({
 }: {
   hostname: string;
   sitemapHostname?: string;
-  sourceData: SitemapItemLoose | string | Readable | string[];
+  sourceData: SitemapItemLoose[] | string | Readable | string[];
   destinationDir: string;
   limit?: number;
   gzip?: boolean;
diff --git a/package-lock.json b/package-lock.json
index b5c4429e..2a9f0d64 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1497,6 +1497,12 @@
           "requires": {
             "type-fest": "^0.8.1"
           }
+        },
+        "ignore": {
+          "version": "4.0.6",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
+          "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==",
+          "dev": true
         }
       }
     },
@@ -2390,19 +2396,12 @@
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
       "dev": true
     },
-    "@types/events": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
-      "integrity": "sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==",
-      "dev": true
-    },
     "@types/glob": {
-      "version": "7.1.1",
-      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
-      "integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.3.tgz",
+      "integrity": "sha512-SEYeGAIQIQX8NN6LDKprLjbrd5dARM5EXsd8GI/A5l0apYI1fGMWgPHSe4ZKL4eozlAyI+doUE9XbYS4xCkQ1w==",
       "dev": true,
       "requires": {
-        "@types/events": "*",
         "@types/minimatch": "*",
         "@types/node": "*"
       }
@@ -2442,9 +2441,9 @@
       }
     },
     "@types/jest": {
-      "version": "26.0.13",
-      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-26.0.13.tgz",
-      "integrity": "sha512-sCzjKow4z9LILc6DhBvn5AkIfmQzDZkgtVVKmGwVrs5tuid38ws281D4l+7x1kP487+FlKDh5kfMZ8WSPAdmdA==",
+      "version": "26.0.14",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-26.0.14.tgz",
+      "integrity": "sha512-Hz5q8Vu0D288x3iWXePSn53W7hAjP0H7EQ6QvDO9c7t46mR0lNOLlfuwQ+JkVxuhygHzlzPX+0jKdA3ZgSh+Vg==",
       "dev": true,
       "requires": {
         "jest-diff": "^25.2.1",
@@ -2464,9 +2463,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "14.6.4",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.6.4.tgz",
-      "integrity": "sha512-Wk7nG1JSaMfMpoMJDKUsWYugliB2Vy55pdjLpmLixeyMi7HizW2I/9QoxsPCkXl3dO+ZOVqPumKaDUv5zJu2uQ=="
+      "version": "14.11.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.11.1.tgz",
+      "integrity": "sha512-oTQgnd0hblfLsJ6BvJzzSL+Inogp3lq9fGgqRkMB/ziKMgEUaFl801OncOzUmalfzt14N0oPHMK47ipl+wbTIw=="
     },
     "@types/normalize-package-data": {
       "version": "2.4.0",
@@ -2516,13 +2515,13 @@
       "dev": true
     },
     "@typescript-eslint/eslint-plugin": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.0.1.tgz",
-      "integrity": "sha512-pQZtXupCn11O4AwpYVUX4PDFfmIJl90ZgrEBg0CEcqlwvPiG0uY81fimr1oMFblZnpKAq6prrT9a59pj1x58rw==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.1.1.tgz",
+      "integrity": "sha512-Hoxyt99EA9LMmqo/5PuWWPeWeB3mKyvibfJ1Hy5SfiUpjE8Nqp+5QNd9fOkzL66+fqvIWSIE+Ett16LGMzCGnQ==",
       "dev": true,
       "requires": {
-        "@typescript-eslint/experimental-utils": "4.0.1",
-        "@typescript-eslint/scope-manager": "4.0.1",
+        "@typescript-eslint/experimental-utils": "4.1.1",
+        "@typescript-eslint/scope-manager": "4.1.1",
         "debug": "^4.1.1",
         "functional-red-black-tree": "^1.0.1",
         "regexpp": "^3.0.0",
@@ -2539,55 +2538,55 @@
       }
     },
     "@typescript-eslint/experimental-utils": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.0.1.tgz",
-      "integrity": "sha512-gAqOjLiHoED79iYTt3F4uSHrYmg/GPz/zGezdB0jAdr6S6gwNiR/j7cTZ8nREKVzMVKLd9G3xbg1sV9GClW3sw==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.1.1.tgz",
+      "integrity": "sha512-jzYsNciHoa4Z3c1URtmeT/bamYm8Dwfw6vuN3WHIE/BXb1iC4KveAnXDErTAZtPVxTYBaYn3n2gbt6F6D2rm1A==",
       "dev": true,
       "requires": {
         "@types/json-schema": "^7.0.3",
-        "@typescript-eslint/scope-manager": "4.0.1",
-        "@typescript-eslint/types": "4.0.1",
-        "@typescript-eslint/typescript-estree": "4.0.1",
+        "@typescript-eslint/scope-manager": "4.1.1",
+        "@typescript-eslint/types": "4.1.1",
+        "@typescript-eslint/typescript-estree": "4.1.1",
         "eslint-scope": "^5.0.0",
         "eslint-utils": "^2.0.0"
       }
     },
     "@typescript-eslint/parser": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-4.0.1.tgz",
-      "integrity": "sha512-1+qLmXHNAWSQ7RB6fdSQszAiA7JTwzakj5cNYjBTUmpH2cqilxMZEIV+DRKjVZs8NzP3ALmKexB0w/ExjcK9Iw==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-4.1.1.tgz",
+      "integrity": "sha512-NLIhmicpKGfJbdXyQBz9j48PA6hq6e+SDOoXy7Ak6bq1ebGqbgG+fR1UIDAuay6OjQdot69c/URu2uLlsP8GQQ==",
       "dev": true,
       "requires": {
-        "@typescript-eslint/scope-manager": "4.0.1",
-        "@typescript-eslint/types": "4.0.1",
-        "@typescript-eslint/typescript-estree": "4.0.1",
+        "@typescript-eslint/scope-manager": "4.1.1",
+        "@typescript-eslint/types": "4.1.1",
+        "@typescript-eslint/typescript-estree": "4.1.1",
         "debug": "^4.1.1"
       }
     },
     "@typescript-eslint/scope-manager": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-4.0.1.tgz",
-      "integrity": "sha512-u3YEXVJ8jsj7QCJk3om0Y457fy2euEOkkzxIB/LKU3MdyI+FJ2gI0M4aKEaXzwCSfNDiZ13a3lDo5DVozc+XLQ==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-4.1.1.tgz",
+      "integrity": "sha512-0W8TTobCvIIQ2FsrYTffyZGAAFUyIbEHq5EYJb1m7Rpd005jrnOvKOo8ywCLhs/Bm17C+KsrUboBvBAARQVvyA==",
       "dev": true,
       "requires": {
-        "@typescript-eslint/types": "4.0.1",
-        "@typescript-eslint/visitor-keys": "4.0.1"
+        "@typescript-eslint/types": "4.1.1",
+        "@typescript-eslint/visitor-keys": "4.1.1"
       }
     },
     "@typescript-eslint/types": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.0.1.tgz",
-      "integrity": "sha512-S+gD3fgbkZYW2rnbjugNMqibm9HpEjqZBZkTiI3PwbbNGWmAcxolWIUwZ0SKeG4Dy2ktpKKaI/6+HGYVH8Qrlg==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.1.1.tgz",
+      "integrity": "sha512-zrBiqOKYerMTllKcn+BP+i1b7LW/EbMMYytroXMxUTvFPn1smkCu0D7lSAx29fTUO4jnwV0ljSvYQtn2vNrNxA==",
       "dev": true
     },
     "@typescript-eslint/typescript-estree": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.0.1.tgz",
-      "integrity": "sha512-zGzleORFXrRWRJAMLTB2iJD1IZbCPkg4hsI8mGdpYlKaqzvKYSEWVAYh14eauaR+qIoZVWrXgYSXqLtTlxotiw==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.1.1.tgz",
+      "integrity": "sha512-2AUg5v0liVBsqbGxBphbJ0QbGqSRVaF5qPoTPWcxop+66vMdU1h4CCvHxTC47+Qb+Pr4l2RhXDd41JNpwcQEKw==",
       "dev": true,
       "requires": {
-        "@typescript-eslint/types": "4.0.1",
-        "@typescript-eslint/visitor-keys": "4.0.1",
+        "@typescript-eslint/types": "4.1.1",
+        "@typescript-eslint/visitor-keys": "4.1.1",
         "debug": "^4.1.1",
         "globby": "^11.0.1",
         "is-glob": "^4.0.1",
@@ -2596,26 +2595,6 @@
         "tsutils": "^3.17.1"
       },
       "dependencies": {
-        "globby": {
-          "version": "11.0.1",
-          "resolved": "https://registry.npmjs.org/globby/-/globby-11.0.1.tgz",
-          "integrity": "sha512-iH9RmgwCmUJHi2z5o2l3eTtGBtXek1OYlHrbcxOYugyHLmAsZrPj43OtHThd62Buh/Vv6VyCBD2bdyWcGNQqoQ==",
-          "dev": true,
-          "requires": {
-            "array-union": "^2.1.0",
-            "dir-glob": "^3.0.1",
-            "fast-glob": "^3.1.1",
-            "ignore": "^5.1.4",
-            "merge2": "^1.3.0",
-            "slash": "^3.0.0"
-          }
-        },
-        "ignore": {
-          "version": "5.1.8",
-          "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.1.8.tgz",
-          "integrity": "sha512-BMpfD7PpiETpBl/A6S498BaIJ6Y/ABT93ETbby2fP00v4EbvPBXWEoaR1UBPKs3iR53pJY7EtZk5KACI57i1Uw==",
-          "dev": true
-        },
         "semver": {
           "version": "7.3.2",
           "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
@@ -2625,12 +2604,12 @@
       }
     },
     "@typescript-eslint/visitor-keys": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.0.1.tgz",
-      "integrity": "sha512-yBSqd6FjnTzbg5RUy9J+9kJEyQjTI34JdGMJz+9ttlJzLCnGkBikxw+N5n2VDcc3CesbIEJ0MnZc5uRYnrEnCw==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.1.1.tgz",
+      "integrity": "sha512-/EOOXbA2ferGLG6RmCHEQ0lTTLkOlXYDgblCmQk3tIU7mTPLm4gKhFMeeUSe+bcchTUsKeCk8xcpbop5Zr/8Rw==",
       "dev": true,
       "requires": {
-        "@typescript-eslint/types": "4.0.1",
+        "@typescript-eslint/types": "4.1.1",
         "eslint-visitor-keys": "^2.0.0"
       },
       "dependencies": {
@@ -2675,9 +2654,9 @@
       }
     },
     "acorn-jsx": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.2.0.tgz",
-      "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==",
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz",
+      "integrity": "sha512-K0Ptm/47OKfQRpNQ2J/oIN/3QYiK6FwW+eJbILhsdxh2WTLdl+30o8aGdTbm5JbffpFFAg/g+zi1E+jvJha5ng==",
       "dev": true
     },
     "acorn-walk": {
@@ -3744,27 +3723,27 @@
       "dev": true
     },
     "cosmiconfig": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-6.0.0.tgz",
-      "integrity": "sha512-xb3ZL6+L8b9JLLCx3ZdoZy4+2ECphCMo2PwqgP1tlfVq6M6YReyzBJtvWWtbDSpNr9hn96pkCiZqUcFEc+54Qg==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.0.0.tgz",
+      "integrity": "sha512-pondGvTuVYDk++upghXJabWzL6Kxu6f26ljFw64Swq9v6sQPUL3EUlVDV56diOjpCayKihL6hVe8exIACU4XcA==",
       "dev": true,
       "requires": {
         "@types/parse-json": "^4.0.0",
-        "import-fresh": "^3.1.0",
+        "import-fresh": "^3.2.1",
         "parse-json": "^5.0.0",
         "path-type": "^4.0.0",
-        "yaml": "^1.7.2"
+        "yaml": "^1.10.0"
       },
       "dependencies": {
         "parse-json": {
-          "version": "5.0.0",
-          "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.0.0.tgz",
-          "integrity": "sha512-OOY5b7PAEFV0E2Fir1KOkxchnZNCdowAJgQ5NuxjpBKTRP3pQhwkrkxqQjeoKJ+fO7bCpmIZaogI4eZGDMEGOw==",
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.1.0.tgz",
+          "integrity": "sha512-+mi/lmVVNKFNVyLXV31ERiy2CY5E1/F6QtJFEzoChPRwwngMNXRDQ9GJ5WdE2Z2P4AujsOi0/+2qHID68KwfIQ==",
           "dev": true,
           "requires": {
             "@babel/code-frame": "^7.0.0",
             "error-ex": "^1.3.1",
-            "json-parse-better-errors": "^1.0.1",
+            "json-parse-even-better-errors": "^2.3.0",
             "lines-and-columns": "^1.1.6"
           }
         }
@@ -4143,9 +4122,9 @@
       }
     },
     "eslint": {
-      "version": "7.8.1",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.8.1.tgz",
-      "integrity": "sha512-/2rX2pfhyUG0y+A123d0ccXtMm7DV7sH1m3lk9nk2DZ2LReq39FXHueR9xZwshE5MdfSf0xunSaMWRqyIA6M1w==",
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.9.0.tgz",
+      "integrity": "sha512-V6QyhX21+uXp4T+3nrNfI3hQNBDa/P8ga7LoQOenwrlEFXrEnUEE+ok1dMtaS3b6rmLXhT1TkTIsG75HMLbknA==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
@@ -4237,6 +4216,12 @@
             "type-fest": "^0.8.1"
           }
         },
+        "ignore": {
+          "version": "4.0.6",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
+          "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==",
+          "dev": true
+        },
         "semver": {
           "version": "7.3.2",
           "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
@@ -4264,9 +4249,9 @@
       }
     },
     "eslint-plugin-jest": {
-      "version": "24.0.0",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-jest/-/eslint-plugin-jest-24.0.0.tgz",
-      "integrity": "sha512-a0G7hSDbuBCW4PNT6MVpAyfnGbUDOqxzOyhR6wT2BIBnR7MhvfAqd6KKfsTjX+Z3gxzIHiEsihzdClU4cSc6qQ==",
+      "version": "24.0.2",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-jest/-/eslint-plugin-jest-24.0.2.tgz",
+      "integrity": "sha512-DSBLNpkKDOpUJQkTGSs5sVJWsu0nDyQ2rYxkr0Eh7nrkc5bMUr/dlDbtTj3l8y6UaCVsem6rryF1OZrKnz1S5g==",
       "dev": true,
       "requires": {
         "@typescript-eslint/experimental-utils": "^4.0.1"
@@ -4282,12 +4267,12 @@
       }
     },
     "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==",
       "dev": true,
       "requires": {
-        "esrecurse": "^4.1.0",
+        "esrecurse": "^4.3.0",
         "estraverse": "^4.1.1"
       }
     },
@@ -4756,9 +4741,9 @@
       "dev": true
     },
     "fast-glob": {
-      "version": "3.2.2",
-      "resolved": "https://registry.npmjs.org/fast-glob/-/fast-glob-3.2.2.tgz",
-      "integrity": "sha512-UDV82o4uQyljznxwMxyVRJgZZt3O5wENYojjzbaGEGZgeOxkLFf+V4cnUD+krzb2F72E18RhamkMZ7AdeggF7A==",
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/fast-glob/-/fast-glob-3.2.4.tgz",
+      "integrity": "sha512-kr/Oo6PX51265qeuCYsyGypiO5uJFgBS0jksyG7FUeCyQzNwYnzrNIMR1NXfkZXsMYXYLRAHgISHBz8gQcxKHQ==",
       "dev": true,
       "requires": {
         "@nodelib/fs.stat": "^2.0.2",
@@ -5052,27 +5037,17 @@
       "dev": true
     },
     "globby": {
-      "version": "10.0.0",
-      "resolved": "https://registry.npmjs.org/globby/-/globby-10.0.0.tgz",
-      "integrity": "sha512-3LifW9M4joGZasyYPz2A1U74zbC/45fvpXUvO/9KbSa+VV0aGZarWkfdgKyR9sExNP0t0x0ss/UMJpNpcaTspw==",
+      "version": "11.0.1",
+      "resolved": "https://registry.npmjs.org/globby/-/globby-11.0.1.tgz",
+      "integrity": "sha512-iH9RmgwCmUJHi2z5o2l3eTtGBtXek1OYlHrbcxOYugyHLmAsZrPj43OtHThd62Buh/Vv6VyCBD2bdyWcGNQqoQ==",
       "dev": true,
       "requires": {
-        "@types/glob": "^7.1.1",
         "array-union": "^2.1.0",
         "dir-glob": "^3.0.1",
-        "fast-glob": "^3.0.3",
-        "glob": "^7.1.3",
-        "ignore": "^5.1.1",
-        "merge2": "^1.2.3",
+        "fast-glob": "^3.1.1",
+        "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==",
-          "dev": true
-        }
       }
     },
     "graceful-fs": {
@@ -5220,15 +5195,15 @@
       "dev": true
     },
     "husky": {
-      "version": "4.2.5",
-      "resolved": "https://registry.npmjs.org/husky/-/husky-4.2.5.tgz",
-      "integrity": "sha512-SYZ95AjKcX7goYVZtVZF2i6XiZcHknw50iXvY7b0MiGoj5RwdgRQNEHdb+gPDPCXKlzwrybjFjkL6FOj8uRhZQ==",
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/husky/-/husky-4.3.0.tgz",
+      "integrity": "sha512-tTMeLCLqSBqnflBZnlVDhpaIMucSGaYyX6855jM4AguGeWCeSzNdb1mfyWduTZ3pe3SJVvVWGL0jO1iKZVPfTA==",
       "dev": true,
       "requires": {
         "chalk": "^4.0.0",
         "ci-info": "^2.0.0",
         "compare-versions": "^3.6.0",
-        "cosmiconfig": "^6.0.0",
+        "cosmiconfig": "^7.0.0",
         "find-versions": "^3.2.0",
         "opencollective-postinstall": "^2.0.2",
         "pkg-dir": "^4.2.0",
@@ -5248,9 +5223,9 @@
           }
         },
         "chalk": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.0.0.tgz",
-          "integrity": "sha512-N9oWFcegS0sFr9oh1oz2d7Npos6vNoWW9HvtCg5N1KRFpUhaAhvTv5Y58g880fZaEYSNm3qDz8SU1UrGvp+n7A==",
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
+          "integrity": "sha512-qwx12AxXe2Q5xQ43Ac//I6v5aXTipYrSESdOgzrN+9XjgEpyjpKuvSGaN4qE93f7TQTlerQQ8S+EQ0EyDoVL1A==",
           "dev": true,
           "requires": {
             "ansi-styles": "^4.1.0",
@@ -5271,21 +5246,6 @@
           "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
           "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
           "dev": true
-        },
-        "has-flag": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
-          "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
-          "dev": true
-        },
-        "supports-color": {
-          "version": "7.1.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.1.0.tgz",
-          "integrity": "sha512-oRSIpR8pxT1Wr2FquTNnGet79b3BWljqOuoW/h4oBhxJ/HUbX5nX6JSruTkvXDCFMwDPvsaTTbvMLKZWSy0R5g==",
-          "dev": true,
-          "requires": {
-            "has-flag": "^4.0.0"
-          }
         }
       }
     },
@@ -5299,9 +5259,9 @@
       }
     },
     "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==",
       "dev": true
     },
     "import-fresh": {
@@ -7910,9 +7870,9 @@
       "dev": true
     },
     "lint-staged": {
-      "version": "10.3.0",
-      "resolved": "https://registry.npmjs.org/lint-staged/-/lint-staged-10.3.0.tgz",
-      "integrity": "sha512-an3VgjHqmJk0TORB/sdQl0CTkRg4E5ybYCXTTCSJ5h9jFwZbcgKIx5oVma5e7wp/uKt17s1QYFmYqT9MGVosGw==",
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/lint-staged/-/lint-staged-10.4.0.tgz",
+      "integrity": "sha512-uaiX4U5yERUSiIEQc329vhCTDDwUcSvKdRLsNomkYLRzijk3v8V9GWm2Nz0RMVB87VcuzLvtgy6OsjoH++QHIg==",
       "dev": true,
       "requires": {
         "chalk": "^4.1.0",
@@ -7967,19 +7927,6 @@
           "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
           "dev": true
         },
-        "cosmiconfig": {
-          "version": "7.0.0",
-          "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-7.0.0.tgz",
-          "integrity": "sha512-pondGvTuVYDk++upghXJabWzL6Kxu6f26ljFw64Swq9v6sQPUL3EUlVDV56diOjpCayKihL6hVe8exIACU4XcA==",
-          "dev": true,
-          "requires": {
-            "@types/parse-json": "^4.0.0",
-            "import-fresh": "^3.2.1",
-            "parse-json": "^5.0.0",
-            "path-type": "^4.0.0",
-            "yaml": "^1.10.0"
-          }
-        },
         "execa": {
           "version": "4.0.3",
           "resolved": "https://registry.npmjs.org/execa/-/execa-4.0.3.tgz",
@@ -8020,24 +7967,6 @@
           "requires": {
             "path-key": "^3.0.0"
           }
-        },
-        "parse-json": {
-          "version": "5.1.0",
-          "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.1.0.tgz",
-          "integrity": "sha512-+mi/lmVVNKFNVyLXV31ERiy2CY5E1/F6QtJFEzoChPRwwngMNXRDQ9GJ5WdE2Z2P4AujsOi0/+2qHID68KwfIQ==",
-          "dev": true,
-          "requires": {
-            "@babel/code-frame": "^7.0.0",
-            "error-ex": "^1.3.1",
-            "json-parse-even-better-errors": "^2.3.0",
-            "lines-and-columns": "^1.1.6"
-          }
-        },
-        "yaml": {
-          "version": "1.10.0",
-          "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.0.tgz",
-          "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg==",
-          "dev": true
         }
       }
     },
@@ -8330,9 +8259,9 @@
       "dev": true
     },
     "merge2": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.3.0.tgz",
-      "integrity": "sha512-2j4DAdlBOkiSZIsaXk4mTE3sRS02yBHAtfy127xRV3bQUFqXkjHCHLW6Scv7DwNRbIWNHH8zpnz9zMaKXIdvYw==",
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.4.1.tgz",
+      "integrity": "sha512-8q7VEgMJW4J8tcfVPy8g09NcQwZdbwFEqhe/WZkoIzjn/3TGDwtOCYtXGxA3O8tPzpczCCDgv+P2P5y00ZJOOg==",
       "dev": true
     },
     "methods": {
@@ -8650,9 +8579,9 @@
       }
     },
     "opencollective-postinstall": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/opencollective-postinstall/-/opencollective-postinstall-2.0.2.tgz",
-      "integrity": "sha512-pVOEP16TrAO2/fjej1IdOyupJY8KDUM1CvsaScRbw6oddvpQoOfGk4ywha0HKKVAD6RkW4x6Q+tNBwhf3Bgpuw==",
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/opencollective-postinstall/-/opencollective-postinstall-2.0.3.tgz",
+      "integrity": "sha512-8AV/sCtuzUeTo8gQK5qDZzARrulB3egtLzFgteqB2tcT4Mw7B8Kt7JcDHmltjz6FOAHsvTevk70gZEbhM4ZS9Q==",
       "dev": true
     },
     "optionator": {
@@ -8881,9 +8810,9 @@
       "dev": true
     },
     "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==",
       "dev": true
     },
     "prettier-linter-helpers": {
@@ -9877,9 +9806,9 @@
       "dev": true
     },
     "sort-package-json": {
-      "version": "1.44.0",
-      "resolved": "https://registry.npmjs.org/sort-package-json/-/sort-package-json-1.44.0.tgz",
-      "integrity": "sha512-u9GUZvpavUCXV5SbEqXu9FRbsJrYU6WM10r3zA0gymGPufK5X82MblCLh9GW9l46pXKEZvK+FA3eVTqC4oMp4A==",
+      "version": "1.46.0",
+      "resolved": "https://registry.npmjs.org/sort-package-json/-/sort-package-json-1.46.0.tgz",
+      "integrity": "sha512-Fn5iiGKkATkEOQ0rol45dClfvNNW3r6PZ87mU4rbpz/M0Dxz+0D6oEU8nfpwUB5rd8u+WzsH2BQ/kRDwz+yVDQ==",
       "dev": true,
       "requires": {
         "detect-indent": "^6.0.0",
@@ -9888,6 +9817,24 @@
         "globby": "10.0.0",
         "is-plain-obj": "2.1.0",
         "sort-object-keys": "^1.1.3"
+      },
+      "dependencies": {
+        "globby": {
+          "version": "10.0.0",
+          "resolved": "https://registry.npmjs.org/globby/-/globby-10.0.0.tgz",
+          "integrity": "sha512-3LifW9M4joGZasyYPz2A1U74zbC/45fvpXUvO/9KbSa+VV0aGZarWkfdgKyR9sExNP0t0x0ss/UMJpNpcaTspw==",
+          "dev": true,
+          "requires": {
+            "@types/glob": "^7.1.1",
+            "array-union": "^2.1.0",
+            "dir-glob": "^3.0.1",
+            "fast-glob": "^3.0.3",
+            "glob": "^7.1.3",
+            "ignore": "^5.1.1",
+            "merge2": "^1.2.3",
+            "slash": "^3.0.0"
+          }
+        }
       }
     },
     "source-map": {
@@ -10758,13 +10705,10 @@
       "dev": true
     },
     "yaml": {
-      "version": "1.8.3",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.8.3.tgz",
-      "integrity": "sha512-X/v7VDnK+sxbQ2Imq4Jt2PRUsRsP7UcpSl3Llg6+NRRqWLIvxkMFYtH1FmvwNGYRKKPa+EPA4qDBlI9WVG1UKw==",
-      "dev": true,
-      "requires": {
-        "@babel/runtime": "^7.8.7"
-      }
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.0.tgz",
+      "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg==",
+      "dev": true
     },
     "yargs": {
       "version": "13.3.2",
diff --git a/package.json b/package.json
index c4c0afb8..c76d95e7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sitemap",
-  "version": "6.3.0",
+  "version": "6.3.1",
   "description": "Sitemap-generating lib/cli",
   "keywords": [
     "sitemap",
@@ -155,7 +155,7 @@
     }
   },
   "dependencies": {
-    "@types/node": "^14.6.4",
+    "@types/node": "^14.11.1",
     "@types/sax": "^1.2.1",
     "arg": "^4.1.3",
     "sax": "^1.2.4"
@@ -168,22 +168,22 @@
     "@babel/plugin-transform-typescript": "^7.11.0",
     "@babel/preset-env": "^7.11.5",
     "@babel/preset-typescript": "^7.10.4",
-    "@types/jest": "^26.0.13",
-    "@typescript-eslint/eslint-plugin": "^4.0.1",
-    "@typescript-eslint/parser": "^4.0.1",
+    "@types/jest": "^26.0.14",
+    "@typescript-eslint/eslint-plugin": "^4.1.1",
+    "@typescript-eslint/parser": "^4.1.1",
     "babel-eslint": "^10.1.0",
     "babel-polyfill": "^6.26.0",
     "concurrently": "^5.3.0",
-    "eslint": "^7.8.1",
+    "eslint": "^7.9.0",
     "eslint-config-prettier": "^6.11.0",
-    "eslint-plugin-jest": "^24.0.0",
+    "eslint-plugin-jest": "^24.0.2",
     "eslint-plugin-prettier": "^3.1.4",
     "express": "^4.17.1",
-    "husky": "^4.2.5",
+    "husky": "^4.3.0",
     "jest": "^26.4.2",
-    "lint-staged": "^10.3.0",
-    "prettier": "^2.1.1",
-    "sort-package-json": "^1.44.0",
+    "lint-staged": "^10.4.0",
+    "prettier": "^2.1.2",
+    "sort-package-json": "^1.46.0",
     "source-map": "~0.7.3",
     "stats-lite": "^2.2.0",
     "stream-json": "^1.7.1",
diff --git a/tests/sitemap-simple.test.ts b/tests/sitemap-simple.test.ts
index b7df643d..f9a3cf95 100644
--- a/tests/sitemap-simple.test.ts
+++ b/tests/sitemap-simple.test.ts
@@ -75,6 +75,37 @@ describe('simpleSitemapAndIndex', () => {
     expect(xml.toString()).toContain('https://1.example.com/a');
   });
 
+  it('accepts sitemapItemLoose as a type', async () => {
+    const baseURL = 'https://example.com/sub/';
+
+    await simpleSitemapAndIndex({
+      hostname: baseURL,
+      sourceData: [
+        { url: 'https://1.example.com/a' },
+        { url: 'https://2.example.com/a' },
+        { url: 'https://3.example.com/a' },
+        { url: 'https://4.example.com/a' },
+      ],
+      destinationDir: targetFolder,
+    });
+
+    const index = (
+      await streamToPromise(
+        createReadStream(resolve(targetFolder, `./sitemap-index.xml.gz`)).pipe(
+          createGunzip()
+        )
+      )
+    ).toString();
+    expect(index).toContain(`${baseURL}sitemap-0`);
+    expect(existsSync(resolve(targetFolder, `./sitemap-0.xml.gz`))).toBe(true);
+    const xml = await streamToPromise(
+      createReadStream(resolve(targetFolder, `./sitemap-0.xml.gz`)).pipe(
+        createGunzip()
+      )
+    );
+    expect(xml.toString()).toContain('https://1.example.com/a');
+  });
+
   it('accepts a filepath', async () => {
     const baseURL = 'http://example.com';
     await simpleSitemapAndIndex({