diff --git a/package-lock.json b/package-lock.json
index 953ccc3..bf86c40 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -79,10 +79,10 @@
       "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
       "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
     },
-    "core-util-is": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
-      "integrity": "sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ=="
+    "date-format": {
+      "version": "4.0.14",
+      "resolved": "https://registry.npmjs.org/date-format/-/date-format-4.0.14.tgz",
+      "integrity": "sha512-39BOQLs9ZjKh0/patS9nrT8wc3ioX3/eA/zgbKNopnF2wCqJEoxywwwElATYvRsXdnOxA/OQeQoFZ3rFjVajhg=="
     },
     "debug": {
       "version": "2.2.0",
@@ -232,6 +232,11 @@
         "unpipe": "~1.0.0"
       }
     },
+    "flatted": {
+      "version": "3.2.7",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.2.7.tgz",
+      "integrity": "sha512-5nqDSxl8nn5BSNxyR3n4I6eDmbolI6WT+QqR547RwxQapgjQBmtktdP+HTBb/a/zLsbzERTONyUB5pefh5TtjQ=="
+    },
     "forwarded": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
@@ -242,11 +247,26 @@
       "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.3.0.tgz",
       "integrity": "sha1-ZR+DjiJCTnVm3hYdg1jKoZn4PU8="
     },
+    "fs-extra": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
+      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
+      "requires": {
+        "graceful-fs": "^4.2.0",
+        "jsonfile": "^4.0.0",
+        "universalify": "^0.1.0"
+      }
+    },
     "generic-pool": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/generic-pool/-/generic-pool-2.4.2.tgz",
       "integrity": "sha1-iGvFvwvrfblugby7oHiBjeWmJoM="
     },
+    "graceful-fs": {
+      "version": "4.2.10",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.10.tgz",
+      "integrity": "sha512-9ByhssR2fPVsNZj478qUUbKfmL0+t5BDVyjShtyZZLiK7ZDAArFFfopyOTj0M05wE2tJPisA4iTnnXl2YoPvOA=="
+    },
     "http-errors": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.3.1.tgz",
@@ -271,18 +291,39 @@
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.0.5.tgz",
       "integrity": "sha1-X6eM8wG4JceKvDBC2BJyMEnqI8c="
     },
-    "isarray": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
-      "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8="
+    "jsonfile": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
+      "integrity": "sha512-m6F1R3z8jjlf2imQHS2Qez5sjKWQzbuuhuJ/FKYFRZvPE3PuHcSMVZzfsLhGVOkfd20obL5SWEBew5ShlquNxg==",
+      "requires": {
+        "graceful-fs": "^4.1.6"
+      }
     },
     "log4js": {
-      "version": "0.6.38",
-      "resolved": "https://registry.npmjs.org/log4js/-/log4js-0.6.38.tgz",
-      "integrity": "sha1-LElBFmldb7JUgJQ9P8hy5mKlIv0=",
+      "version": "6.4.0",
+      "resolved": "https://registry.npmjs.org/log4js/-/log4js-6.4.0.tgz",
+      "integrity": "sha512-ysc/XUecZJuN8NoKOssk3V0cQ29xY4fra6fnigZa5VwxFsCsvdqsdnEuAxNN89LlHpbE4KUD3zGcn+kFqonSVQ==",
       "requires": {
-        "readable-stream": "~1.0.2",
-        "semver": "~4.3.3"
+        "date-format": "^4.0.3",
+        "debug": "^4.3.3",
+        "flatted": "^3.2.4",
+        "rfdc": "^1.3.0",
+        "streamroller": "^3.0.2"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.4",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+          "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+        }
       }
     },
     "manakin": {
@@ -509,27 +550,16 @@
         }
       }
     },
-    "readable-stream": {
-      "version": "1.0.34",
-      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
-      "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
-      "requires": {
-        "core-util-is": "~1.0.0",
-        "inherits": "~2.0.1",
-        "isarray": "0.0.1",
-        "string_decoder": "~0.10.x"
-      }
+    "rfdc": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/rfdc/-/rfdc-1.3.0.tgz",
+      "integrity": "sha512-V2hovdzFbOi77/WajaSMXk2OLm+xNIeQdMMuB7icj7bk6zi2F8GGAxigcnDFpJHbNyNcgyJDiP+8nOrY5cZGrA=="
     },
     "safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
       "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
     },
-    "semver": {
-      "version": "4.3.6",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-4.3.6.tgz",
-      "integrity": "sha1-MAvG4OhjdPe6YQaLWx7NV/xlMto="
-    },
     "send": {
       "version": "0.13.1",
       "resolved": "https://registry.npmjs.org/send/-/send-0.13.1.tgz",
@@ -638,10 +668,30 @@
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
       "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
     },
-    "string_decoder": {
-      "version": "0.10.31",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-      "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ="
+    "streamroller": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/streamroller/-/streamroller-3.1.5.tgz",
+      "integrity": "sha512-KFxaM7XT+irxvdqSP1LGLgNWbYN7ay5owZ3r/8t77p+EtSUAfUgtl7be3xtqtOmGUl9K9YPO2ca8133RlTjvKw==",
+      "requires": {
+        "date-format": "^4.0.14",
+        "debug": "^4.3.4",
+        "fs-extra": "^8.1.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.4",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+          "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+        }
+      }
     },
     "through": {
       "version": "2.3.8",
@@ -665,6 +715,11 @@
         "random-bytes": "~1.0.0"
       }
     },
+    "universalify": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
+    },
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
diff --git a/package.json b/package.json
index 3b0a82b..c72bb4f 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "ejs-locals": "^1.0.2",
     "express": "~4.13.1",
     "express-session": "^1.13.0",
-    "log4js": "^0.6.36",
+    "log4js": "^6.4.0",
     "morgan": "~1.6.1",
     "pg-promise": "^4.4.6",
     "serve-favicon": "~2.3.0"