diff --git a/package-lock.json b/package-lock.json
index 61346e8..2cbaf82 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "dependencies": {
         "gulp-util": "^3.0.8",
         "htmlhint": "^1.1.4",
-        "through2": "^2.0.3"
+        "through2": "^4.0.2"
       },
       "devDependencies": {
         "gulp": "^4.0.2",
@@ -1427,6 +1427,16 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/fs-mkdirp-stream/node_modules/through2": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "dev": true,
+      "dependencies": {
+        "readable-stream": "~2.3.6",
+        "xtend": "~4.0.1"
+      }
+    },
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       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
@@ -1698,6 +1708,16 @@
         "jshint": "2.x"
       }
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+    "node_modules/gulp-jshint/node_modules/through2": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "dev": true,
+      "dependencies": {
+        "readable-stream": "~2.3.6",
+        "xtend": "~4.0.1"
+      }
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     "node_modules/gulp-util": {
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       "resolved": "https://registry.npmjs.org/gulp-util/-/gulp-util-3.0.8.tgz",
@@ -1727,6 +1747,15 @@
         "node": ">=0.10"
       }
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+    "node_modules/gulp-util/node_modules/through2": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "dependencies": {
+        "readable-stream": "~2.3.6",
+        "xtend": "~4.0.1"
+      }
+    },
     "node_modules/gulplog": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/gulplog/-/gulplog-1.0.0.tgz",
@@ -3513,6 +3542,16 @@
         "node": ">= 0.10"
       }
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+    "node_modules/remove-bom-stream/node_modules/through2": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "dev": true,
+      "dependencies": {
+        "readable-stream": "~2.3.6",
+        "xtend": "~4.0.1"
+      }
+    },
     "node_modules/remove-trailing-separator": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz",
@@ -4077,12 +4116,11 @@
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-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
-      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-4.0.2.tgz",
+      "integrity": "sha512-iOqSav00cVxEEICeD7TjLB1sueEL+81Wpzp2bY17uZjZN0pWZPuo4suZ/61VujxmqSGFfgOcNuTZ85QJwNZQpw==",
       "dependencies": {
-        "readable-stream": "~2.3.6",
-        "xtend": "~4.0.1"
+        "readable-stream": "3"
       }
     },
     "node_modules/through2-filter": {
@@ -4095,6 +4133,29 @@
         "xtend": "~4.0.0"
       }
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+    "node_modules/through2-filter/node_modules/through2": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "dev": true,
+      "dependencies": {
+        "readable-stream": "~2.3.6",
+        "xtend": "~4.0.1"
+      }
+    },
+    "node_modules/through2/node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/time-stamp": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/time-stamp/-/time-stamp-1.1.0.tgz",
@@ -4217,6 +4278,16 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/to-through/node_modules/through2": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "dev": true,
+      "dependencies": {
+        "readable-stream": "~2.3.6",
+        "xtend": "~4.0.1"
+      }
+    },
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       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
@@ -4473,6 +4544,16 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/vinyl-fs/node_modules/through2": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "dev": true,
+      "dependencies": {
+        "readable-stream": "~2.3.6",
+        "xtend": "~4.0.1"
+      }
+    },
     "node_modules/vinyl-fs/node_modules/vinyl": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-2.2.1.tgz",
@@ -5805,6 +5886,18 @@
       "requires": {
         "graceful-fs": "^4.1.11",
         "through2": "^2.0.3"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "dev": true,
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "fs.realpath": {
@@ -6016,6 +6109,18 @@
         "plugin-error": "^0.1.2",
         "rcloader": "^0.2.2",
         "through2": "^2.0.0"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "dev": true,
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "gulp-util": {
@@ -6041,6 +6146,17 @@
         "replace-ext": "0.0.1",
         "through2": "^2.0.0",
         "vinyl": "^0.5.0"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "gulplog": {
@@ -7469,6 +7585,18 @@
         "remove-bom-buffer": "^3.0.0",
         "safe-buffer": "^5.1.0",
         "through2": "^2.0.3"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "dev": true,
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "remove-trailing-separator": {
@@ -7929,12 +8057,23 @@
       }
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     "through2": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
-      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-4.0.2.tgz",
+      "integrity": "sha512-iOqSav00cVxEEICeD7TjLB1sueEL+81Wpzp2bY17uZjZN0pWZPuo4suZ/61VujxmqSGFfgOcNuTZ85QJwNZQpw==",
       "requires": {
-        "readable-stream": "~2.3.6",
-        "xtend": "~4.0.1"
+        "readable-stream": "3"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "3.6.2",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+          "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+          "requires": {
+            "inherits": "^2.0.3",
+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
+          }
+        }
       }
     },
     "through2-filter": {
@@ -7945,6 +8084,18 @@
       "requires": {
         "through2": "~2.0.0",
         "xtend": "~4.0.0"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "dev": true,
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "time-stamp": {
@@ -8041,6 +8192,18 @@
       "dev": true,
       "requires": {
         "through2": "^2.0.3"
+      },
+      "dependencies": {
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "dev": true,
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        }
       }
     },
     "tr46": {
@@ -8262,6 +8425,16 @@
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           "dev": true
         },
+        "through2": {
+          "version": "2.0.5",
+          "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
+          "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
+          "dev": true,
+          "requires": {
+            "readable-stream": "~2.3.6",
+            "xtend": "~4.0.1"
+          }
+        },
         "vinyl": {
           "version": "2.2.1",
           "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-2.2.1.tgz",
diff --git a/package.json b/package.json
index 2009c9a..db820af 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "dependencies": {
     "gulp-util": "^3.0.8",
     "htmlhint": "^1.1.4",
-    "through2": "^2.0.3"
+    "through2": "^4.0.2"
   },
   "devDependencies": {
     "gulp": "^4.0.2",