diff --git a/packages/skrt/package.json b/packages/skrt/package.json
index 5ce9076..f4df98a 100644
--- a/packages/skrt/package.json
+++ b/packages/skrt/package.json
@@ -26,7 +26,7 @@
     "browser-sync": "^2.26.14",
     "common-tags": "^1.8.0",
     "glob": "^7.1.6",
-    "mdast-util-toc": "^5.1.0",
+    "mdast-util-toc": "^6.0.0",
     "pirates": "^4.0.1",
     "polka": "^0.5.2",
     "react": "^17.0.1",
diff --git a/yarn.lock b/yarn.lock
index 7f5d4fe..4b94010 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1344,6 +1344,16 @@
     lodash.merge "^4.6.2"
     lodash.uniq "^4.5.0"
 
+"@types/extend@^3.0.0":
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/@types/extend/-/extend-3.0.1.tgz#923dc2d707d944382433e01d6cc0c69030ab2c75"
+  integrity sha512-R1g/VyKFFI2HLC1QGAeTtCBWCo6n75l41OnsVYNbmKG+kempOESaodf6BeJyUM3Q0rKa/NQcTHbB2+66lNnxLw==
+
+"@types/github-slugger@^1.0.0":
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/@types/github-slugger/-/github-slugger-1.3.0.tgz#16ab393b30d8ae2a111ac748a015ac05a1fc5524"
+  integrity sha512-J/rMZa7RqiH/rT29TEVZO4nBoDP9XJOjnbbIofg7GQKs4JIduEO3WLpte+6WeUz/TcrXKlY+bM7FYrp8yFB+3g==
+
 "@types/hast@^2.0.0":
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/@types/hast/-/hast-2.3.1.tgz#b16872f2a6144c7025f296fb9636a667ebb79cd9"
@@ -1356,7 +1366,7 @@
   resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
   integrity sha1-7ihweulOEdK4J7y+UnC86n8+ce4=
 
-"@types/mdast@^3.0.0", "@types/mdast@^3.0.3":
+"@types/mdast@^3.0.0":
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/@types/mdast/-/mdast-3.0.3.tgz#2d7d671b1cd1ea3deb306ea75036c2a0407d2deb"
   integrity sha512-SXPBMnFVQg1s00dlMCc/jCdvPqdE4mXaMMCeRlxLDmTAEoegHT53xKtkDnzDTOcmMHUfcjyf36/YYZ6SxRdnsw==
@@ -3055,7 +3065,7 @@ execa@^0.7.0:
     signal-exit "^3.0.0"
     strip-eof "^1.0.0"
 
-extend@^3.0.0, extend@^3.0.2, extend@~3.0.2:
+extend@^3.0.0, extend@~3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.2.tgz#f8b1136b4071fbd8eb140aff858b1019ec2915fa"
   integrity sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==
@@ -3311,7 +3321,7 @@ getpass@^0.1.1:
   dependencies:
     assert-plus "^1.0.0"
 
-github-slugger@^1.0.0, github-slugger@^1.2.1:
+github-slugger@^1.0.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/github-slugger/-/github-slugger-1.3.0.tgz#9bd0a95c5efdfc46005e82a906ef8e2a059124c9"
   integrity sha512-gwJScWVNhFYSRDvURk/8yhcFBee6aFjye2a7Lhb2bUyRulpIoek9p0I9Kt7PT67d/nUlZbFu8L9RLiA0woQN8Q==
@@ -4328,23 +4338,25 @@ mdast-util-to-string@^1.0.0:
   resolved "https://registry.yarnpkg.com/mdast-util-to-string/-/mdast-util-to-string-1.1.0.tgz#27055500103f51637bd07d01da01eb1967a43527"
   integrity sha512-jVU0Nr2B9X3MU4tSK7JP1CMkSvOj7X5l/GboG1tKRw52lLF1x2Ju92Ms9tNetCcbfX3hzlM73zYo2NKkWSfF/A==
 
-mdast-util-to-string@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/mdast-util-to-string/-/mdast-util-to-string-2.0.0.tgz#b8cfe6a713e1091cb5b728fc48885a4767f8b97b"
-  integrity sha512-AW4DRS3QbBayY/jJmD8437V1Gombjf8RSOUCMFBuo5iHi58AGEgVCKQ+ezHkZZDpAQS75hcBMpLqjpJTjtUL7w==
+mdast-util-to-string@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/mdast-util-to-string/-/mdast-util-to-string-3.1.0.tgz#56c506d065fbf769515235e577b5a261552d56e9"
+  integrity sha512-n4Vypz/DZgwo0iMHLQL49dJzlp7YtAJP+N07MZHpjPf/5XJuHUWstviF4Mn2jEiR/GNmtnRRqnwsXExk3igfFA==
 
-mdast-util-toc@^5.1.0:
-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/mdast-util-toc/-/mdast-util-toc-5.1.0.tgz#3af0f9c9a764b993538af03f1f79f4e3cec22736"
-  integrity sha512-csimbRIVkiqc+PpFeKDGQ/Ck2N4f9FYH3zzBMMJzcxoKL8m+cM0n94xXm0I9eaxHnKdY9n145SGTdyJC7i273g==
+mdast-util-toc@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/mdast-util-toc/-/mdast-util-toc-6.0.0.tgz#e8b5d502fc6d150ac95f4be10a0e73d588938095"
+  integrity sha512-rzwoIcNVxzcRSy2HVaGmGqJiY5xW0r9fWP0dn8ws090zvnyiZ2LoDi12laspElp8Rr7dwh+RISJQC8Lu7jWvvQ==
   dependencies:
-    "@types/mdast" "^3.0.3"
-    "@types/unist" "^2.0.3"
-    extend "^3.0.2"
-    github-slugger "^1.2.1"
-    mdast-util-to-string "^2.0.0"
-    unist-util-is "^4.0.0"
-    unist-util-visit "^2.0.0"
+    "@types/extend" "^3.0.0"
+    "@types/github-slugger" "^1.0.0"
+    "@types/mdast" "^3.0.0"
+    "@types/unist" "^2.0.0"
+    extend "^3.0.0"
+    github-slugger "^1.0.0"
+    mdast-util-to-string "^3.1.0"
+    unist-util-is "^5.0.0"
+    unist-util-visit "^3.0.0"
 
 mdn-data@2.0.14:
   version "2.0.14"
@@ -6406,6 +6418,11 @@ unist-util-is@^4.0.0:
   resolved "https://registry.yarnpkg.com/unist-util-is/-/unist-util-is-4.0.4.tgz#3e9e8de6af2eb0039a59f50c9b3e99698a924f50"
   integrity sha512-3dF39j/u423v4BBQrk1AQ2Ve1FxY5W3JKwXxVFzBODQ6WEvccguhgp802qQLKSnxPODE6WuRZtV+ohlUg4meBA==
 
+unist-util-is@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/unist-util-is/-/unist-util-is-5.0.0.tgz#c71eddea34aa7009d54f671a6fafb3779b8035d3"
+  integrity sha512-G4p13DhfdUNmlnJxd0uy5Skx1FG58LSDhX8h1xgpeSq0omOQ4ZN5BO54ToFlNX55NDTbRHMdwTOJXqAieInSEA==
+
 unist-util-map@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/unist-util-map/-/unist-util-map-2.0.1.tgz#c3fca064486d3937c4dad8b39c64974faae7c7c4"
@@ -6448,6 +6465,14 @@ unist-util-visit-parents@^3.0.0:
     "@types/unist" "^2.0.0"
     unist-util-is "^4.0.0"
 
+unist-util-visit-parents@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/unist-util-visit-parents/-/unist-util-visit-parents-4.0.0.tgz#0dfc00046ac753517ffaaf59b80d1ac892b352a6"
+  integrity sha512-QyATSx30wHguIzI82+GVeuXGnFlh3AUVcyeZPOo5Paz2Z52zfRe3/0WLlBv6XlMWcr5xEdFqox6PteUL6hzEFA==
+  dependencies:
+    "@types/unist" "^2.0.0"
+    unist-util-is "^5.0.0"
+
 unist-util-visit@2.0.3, unist-util-visit@^2.0.0, unist-util-visit@^2.0.3:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/unist-util-visit/-/unist-util-visit-2.0.3.tgz#c3703893146df47203bb8a9795af47d7b971208c"
@@ -6457,6 +6482,15 @@ unist-util-visit@2.0.3, unist-util-visit@^2.0.0, unist-util-visit@^2.0.3:
     unist-util-is "^4.0.0"
     unist-util-visit-parents "^3.0.0"
 
+unist-util-visit@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/unist-util-visit/-/unist-util-visit-3.0.0.tgz#a8e239038f7b29aadc649a6080f42bc85ea1a7bc"
+  integrity sha512-RbFwAZhMekKPZxlAhUIiBwim8NogwUtwLbIjvZehaGORYRDWcApsnGI1VDUHr/Jo6yW1u8VOqO/djbd7Hpz88A==
+  dependencies:
+    "@types/unist" "^2.0.0"
+    unist-util-is "^5.0.0"
+    unist-util-visit-parents "^4.0.0"
+
 universalify@^0.1.0:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/universalify/-/universalify-0.1.2.tgz#b646f69be3942dabcecc9d6639c80dc105efaa66"