diff --git a/package-lock.json b/package-lock.json
index e555016..6e6754e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,7 @@
         "npm-check-updates": "22.2.9"
       },
       "devDependencies": {
-        "@asciidoctor/core": "^3.0.4",
+        "@asciidoctor/core": "^4.0.0",
         "@lmcd/gulp-svgo": "^0.2.0",
         "@ronilaukkarinen/gulp-stylelint": "^14.1.2",
         "autoprefixer": "^10.5.2",
@@ -55,32 +55,13 @@
       }
     },
     "node_modules/@asciidoctor/core": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/@asciidoctor/core/-/core-3.0.4.tgz",
-      "integrity": "sha512-41SDMi7iRRBViPe0L6VWFTe55bv6HEOJeRqMj5+E5wB1YPdUPuTucL4UAESPZM6OWmn4t/5qM5LusXomFUVwVQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@asciidoctor/opal-runtime": "3.0.1",
-        "unxhr": "1.2.0"
-      },
-      "engines": {
-        "node": ">=16",
-        "npm": ">=8"
-      }
-    },
-    "node_modules/@asciidoctor/opal-runtime": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/@asciidoctor/opal-runtime/-/opal-runtime-3.0.1.tgz",
-      "integrity": "sha512-iW7ACahOG0zZft4A/4CqDcc7JX+fWRNjV5tFAVkNCzwZD+EnFolPaUOPYt8jzadc0+Bgd80cQTtRMQnaaV1kkg==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@asciidoctor/core/-/core-4.0.0.tgz",
+      "integrity": "sha512-VWBs5HwU2vRutHTwxbXJE5icmps93o9z7i2qFxbz9jDS8Ga7rlMFIa7QKMAMpdBlTrFip60serEns5hB12IX6Q==",
       "dev": true,
       "license": "MIT",
-      "dependencies": {
-        "glob": "8.1.0",
-        "unxhr": "1.2.0"
-      },
       "engines": {
-        "node": ">=16"
+        "node": ">=20"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -1606,16 +1587,6 @@
       "dev": true,
       "license": "ISC"
     },
-    "node_modules/brace-expansion": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.1.tgz",
-      "integrity": "sha512-WR1cURNjuvBLMZBMbqM0UoE+WAfdUcEV1ccD8PVBVOI+Z3ND4+SZbN8RsfT2bMuG1qwz5RFvPukSZm5fF2D5eA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0"
-      }
-    },
     "node_modules/braces": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.3.tgz",
@@ -4808,27 +4779,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/glob": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-8.1.0.tgz",
-      "integrity": "sha512-r8hpEjiQEYlF2QU0df3dS+nxxSIreXQS1qRhMJM0Q5NDdR386C7jb7Hwwod8Fgiuex+k0GFjgft18yvxm5XoCQ==",
-      "deprecated": "Old versions of glob are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "fs.realpath": "^1.0.0",
-        "inflight": "^1.0.4",
-        "inherits": "2",
-        "minimatch": "^5.0.1",
-        "once": "^1.3.0"
-      },
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "node_modules/glob-parent": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-5.1.2.tgz",
@@ -4926,19 +4876,6 @@
         "node": ">=8.10.0"
       }
     },
-    "node_modules/glob/node_modules/minimatch": {
-      "version": "5.1.9",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.9.tgz",
-      "integrity": "sha512-7o1wEA2RyMP7Iu7GNba9vc0RWWGACJOCZBJX2GJWip0ikV+wcOsgVuY9uE8CPiyQhkGFSlhuSkZPavN7u1c2Fw==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "brace-expansion": "^2.0.1"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/global-modules": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/global-modules/-/global-modules-1.0.0.tgz",
@@ -12145,16 +12082,6 @@
         "node": ">= 0.8"
       }
     },
-    "node_modules/unxhr": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/unxhr/-/unxhr-1.2.0.tgz",
-      "integrity": "sha512-6cGpm8NFXPD9QbSNx0cD2giy7teZ6xOkCUH3U89WKVkL9N9rBrWjlCwhR94Re18ZlAop4MOc3WU1M3Hv/bgpIw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8.11"
-      }
-    },
     "node_modules/update-browserslist-db": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz",
diff --git a/package.json b/package.json
index 8fe4c08..7af3b13 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "npm-check-updates": "22.2.9"
   },
   "devDependencies": {
-    "@asciidoctor/core": "^3.0.4",
+    "@asciidoctor/core": "^4.0.0",
     "@lmcd/gulp-svgo": "^0.2.0",
     "@ronilaukkarinen/gulp-stylelint": "^14.1.2",
     "autoprefixer": "^10.5.2",