diff --git a/package-lock.json b/package-lock.json
index 00b4e2c..9613bab 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,22 +1,35 @@
 {
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+  "version": "0.0.1",
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-      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
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       "dev": true,
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-        "ansi-regex": "^3.0.0"
+        "safe-buffer": "~5.1.0"
       }
     },
     "supports-color": {
@@ -1990,32 +2231,33 @@
       "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
       "dev": true
     },
-    "thenify": {
-      "version": "3.3.0",
-      "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.0.tgz",
-      "integrity": "sha1-5p44obq+lpsBCCB5eLn2K4hgSDk=",
+    "tar-stream": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
+      "integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
       "dev": true,
       "requires": {
-        "any-promise": "^1.0.0"
+        "bl": "^4.0.3",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
       }
     },
-    "thenify-all": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/thenify-all/-/thenify-all-1.6.0.tgz",
-      "integrity": "sha1-GhkY1ALY/D+Y+/I02wvMjMEOlyY=",
-      "dev": true,
-      "requires": {
-        "thenify": ">= 3.1.0 < 4"
-      }
+    "temp-dir": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/temp-dir/-/temp-dir-1.0.0.tgz",
+      "integrity": "sha1-CnwOom06Oa+n4OvqnB/AvE2qAR0=",
+      "dev": true
     },
-    "title-case": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/title-case/-/title-case-2.1.1.tgz",
-      "integrity": "sha1-PhJyFtpY0rxb7PE3q5Ha46fNj6o=",
+    "tempfile": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/tempfile/-/tempfile-2.0.0.tgz",
+      "integrity": "sha1-awRGhWqbERTRhW/8vlCczLCXcmU=",
       "dev": true,
       "requires": {
-        "no-case": "^2.2.0",
-        "upper-case": "^1.0.3"
+        "temp-dir": "^1.0.0",
+        "uuid": "^3.0.1"
       }
     },
     "to-fast-properties": {
@@ -2024,39 +2266,69 @@
       "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
       "dev": true
     },
+    "tough-cookie": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.5.0.tgz",
+      "integrity": "sha512-nlLsUzgm1kfLXSXfRZMc1KLAugd4hqJHDTvc2hDIwS3mZAfMEuMbc03SujMF+GEcpaX/qboeycw6iO8JwVv2+g==",
+      "dev": true,
+      "requires": {
+        "psl": "^1.1.28",
+        "punycode": "^2.1.1"
+      }
+    },
     "trim-right": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
-    "type-detect": {
-      "version": "4.0.8",
-      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
-      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
       "dev": true
     },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
-      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
-    },
-    "upper-case": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/upper-case/-/upper-case-1.1.3.tgz",
-      "integrity": "sha1-9rRQHC7EzdJrp4vnIilh3ndiFZg=",
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
-    "util-arity": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/util-arity/-/util-arity-1.1.0.tgz",
-      "integrity": "sha1-WdAa8f2z/t4KxOYysKtfbOl8kzA=",
+    "uc.micro": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-1.0.6.tgz",
+      "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA==",
       "dev": true
     },
+    "uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
+    "uuid": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
+      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
+      "dev": true
     },
     "verror": {
       "version": "1.10.0",
@@ -2067,6 +2339,14 @@
         "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
         "extsprintf": "^1.2.0"
+      },
+      "dependencies": {
+        "core-util-is": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+          "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
+          "dev": true
+        }
       }
     },
     "which": {
@@ -2081,12 +2361,14 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
     },
     "ws": {
-      "version": "5.2.2",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
-      "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.2.tgz",
+      "integrity": "sha512-zmhltoSR8u1cnDsD43TX59mzoMZsLKqUweyYBAIvTngR3shc0W6aOZylZmq/7hqyVxPdi+5Ud2QInblgyE72fw==",
+      "dev": true,
       "requires": {
         "async-limiter": "~1.0.0"
       }
@@ -2098,11 +2380,24 @@
       "dev": true
     },
     "yauzl": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.4.1.tgz",
-      "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
+      "dev": true,
+      "requires": {
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
+      }
+    },
+    "zip-stream": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/zip-stream/-/zip-stream-2.1.3.tgz",
+      "integrity": "sha512-EkXc2JGcKhO5N5aZ7TmuNo45budRaFGHOmz24wtJR7znbNqDPmdZtUauKX6et8KAVseAMBOyWJqEpXcHTBsh7Q==",
+      "dev": true,
       "requires": {
-        "fd-slicer": "~1.0.1"
+        "archiver-utils": "^2.1.0",
+        "compress-commons": "^2.1.1",
+        "readable-stream": "^3.4.0"
       }
     }
   }
diff --git a/package.json b/package.json
index 5193e20..81ca1d8 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "archiver": "^3.0.0",
     "cross-var": "^1.1.0",
     "epubchecker": "^1.2.0",
-    "markdown-it": "^8.4.2",
+    "markdown-it": "^12.3.2",
     "pdf-puppeteer": "^1.1.4",
     "rimraf": "^2.6.2",
     "slugify": "^1.3.1"
diff --git a/yarn.lock b/yarn.lock
index b911ec4..f9a496c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -65,12 +65,10 @@ archiver@^3.0.0:
     tar-stream "^1.5.0"
     zip-stream "^2.0.1"
 
-argparse@^1.0.7:
-  version "1.0.10"
-  resolved "https://registry.yarnpkg.com/argparse/-/argparse-1.0.10.tgz#bcd6791ea5ae09725e17e5ad988134cd40b3d911"
-  integrity sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==
-  dependencies:
-    sprintf-js "~1.0.2"
+argparse@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/argparse/-/argparse-2.0.1.tgz#246f50f3ca78a3240f6c997e8a9bd1eac49e4b38"
+  integrity sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==
 
 asn1@~0.2.3:
   version "0.2.4"
@@ -1024,10 +1022,10 @@ end-of-stream@^1.0.0:
   dependencies:
     once "^1.4.0"
 
-entities@~1.1.1:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/entities/-/entities-1.1.2.tgz#bdfa735299664dfafd34529ed4f8522a275fea56"
-  integrity sha512-f2LZMYl1Fzu7YSBKg+RoROelpOaNrcGmE9AZubeDfrCEia483oW4MI4VyFd5VNHIgQ/7qm1I0wUHK1eJnn2y2w==
+entities@~2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/entities/-/entities-2.1.0.tgz#992d3129cf7df6870b96c57858c249a120f8b8b5"
+  integrity sha512-hCx1oky9PFrJ611mf0ifBLBRW8lUUVRlFolb5gWRfIELabBlbp9xZvrqZLZAs+NxFnbfQoeGd8wDkygjg7U85w==
 
 epubchecker@^1.2.0:
   version "1.2.0"
@@ -1322,10 +1320,10 @@ lazystream@^1.0.0:
   dependencies:
     readable-stream "^2.0.5"
 
-linkify-it@^2.0.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/linkify-it/-/linkify-it-2.1.0.tgz#c4caf38a6cd7ac2212ef3c7d2bde30a91561f9db"
-  integrity sha512-4REs8/062kV2DSHxNfq5183zrqXMl7WP0WzABH9IeJI+NLm429FgE1PDecltYfnOoFDFlZGh2T8PfZn0r+GTRg==
+linkify-it@^3.0.1:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/linkify-it/-/linkify-it-3.0.3.tgz#a98baf44ce45a550efb4d49c769d07524cc2fa2e"
+  integrity sha512-ynTsyrFSdE5oZ/O9GEf00kPngmOfVwazR5GKDq6EYfhlpFug3J2zybX56a2PRRpc9P+FuSoGNAwjlbDs9jJBPQ==
   dependencies:
     uc.micro "^1.0.1"
 
@@ -1384,14 +1382,14 @@ lru-cache@^4.0.1:
     pseudomap "^1.0.2"
     yallist "^2.1.2"
 
-markdown-it@^8.4.2:
-  version "8.4.2"
-  resolved "https://registry.yarnpkg.com/markdown-it/-/markdown-it-8.4.2.tgz#386f98998dc15a37722aa7722084f4020bdd9b54"
-  integrity sha512-GcRz3AWTqSUphY3vsUqQSFMbgR38a4Lh3GWlHRh/7MRwz8mcu9n2IO7HOh+bXHrR9kOPDl5RNCaEsrneb+xhHQ==
+markdown-it@^12.3.2:
+  version "12.3.2"
+  resolved "https://registry.yarnpkg.com/markdown-it/-/markdown-it-12.3.2.tgz#bf92ac92283fe983fe4de8ff8abfb5ad72cd0c90"
+  integrity sha512-TchMembfxfNVpHkbtriWltGWc+m3xszaRD0CZup7GFFhzIgQqxIfn3eGj1yZpfuflzPvfkt611B2Q/Bsk1YnGg==
   dependencies:
-    argparse "^1.0.7"
-    entities "~1.1.1"
-    linkify-it "^2.0.0"
+    argparse "^2.0.1"
+    entities "~2.1.0"
+    linkify-it "^3.0.1"
     mdurl "^1.0.1"
     uc.micro "^1.0.5"
 
@@ -1708,11 +1706,6 @@ source-map@^0.5.6, source-map@^0.5.7:
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
   integrity sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=
 
-sprintf-js@~1.0.2:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
-  integrity sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=
-
 sshpk@^1.7.0:
   version "1.16.1"
   resolved "https://registry.yarnpkg.com/sshpk/-/sshpk-1.16.1.tgz#fb661c0bef29b39db40769ee39fa70093d6f6877"