diff --git a/config/_default/params.toml b/config/_default/params.toml
index d99ad16..811c3d0 100644
--- a/config/_default/params.toml
+++ b/config/_default/params.toml
@@ -22,7 +22,12 @@ enable = true
 languageCode = "en"
 countryCode = "us"
 
-[features.darkMode]
+[features.theme]
+light = true
+dark = true
+defaultTheme = "system"
+
+[features.copyCodeButton]
 enable = true
 
 [features.comment]
diff --git a/go.mod b/go.mod
index c2cb9de..826d721 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module git.korhonen.cc/FunctionalHacker/korhonen.cc
 
 go 1.21.6
 
-require github.com/hugo-toha/toha/v4 v4.5.0 // indirect
+require github.com/hugo-toha/toha/v4 v4.6.0 // indirect
diff --git a/go.sum b/go.sum
index a153989..4accedd 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/hugo-toha/toha/v4 v4.5.0 h1:0zmVIzhluHkocKRKW49Zjd6xk34xQwJy5sZQ5LNgHuk=
-github.com/hugo-toha/toha/v4 v4.5.0/go.mod h1:p/K34lqlqmhzfPd4cx66od7sjlROBqhMxG30mJz+aKQ=
+github.com/hugo-toha/toha/v4 v4.6.0 h1:u+9KiGyTsC54sHld8HEvLEJBnKjkuuasHwair1wJM2Y=
+github.com/hugo-toha/toha/v4 v4.6.0/go.mod h1:TU/6WXz7fJ3BSrTS+K/sVctzUMF4pB4ZwKWzFBFra8g=
diff --git a/package-lock.json b/package-lock.json
index b449dea..45a659b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,8 +9,8 @@
       "version": "0.1.0",
       "devDependencies": {
         "@fontsource/mulish": "4.5.13",
-        "@fortawesome/fontawesome-free": "^6.2.0",
-        "autoprefixer": "^10.4.13",
+        "@fortawesome/fontawesome-free": "^6.6.0",
+        "autoprefixer": "^10.4.20",
         "bootstrap": "^5.3.3",
         "eslint": "^8.31.0",
         "eslint-config-prettier": "^8.6.0",
@@ -21,19 +21,19 @@
         "eslint-plugin-promise": "^6.1.1",
         "feather-icons": "^4.29.1",
         "filterizr": "^2.2.4",
-        "flag-icon-css": "^4.1.7",
+        "flag-icons": "^7.2.3",
         "fuse.js": "^6.6.2",
         "highlight.js": "^11.6.0",
         "imagesloaded": "^5.0.0",
         "include-media": "^1.4.10",
         "ityped": "^1.0.3",
-        "katex": "^0.16.10",
+        "katex": "^0.16.11",
         "mark.js": "^8.11.1",
         "mermaid": "^9.2.1",
         "plyr": "^3.7.2",
         "popper.js": "^1.16.1",
-        "postcss": "^8.4.31",
-        "postcss-cli": "^8.3.1"
+        "postcss": "^8.4.41",
+        "postcss-cli": "^11.0.0"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
@@ -114,11 +114,11 @@
       "dev": true
     },
     "node_modules/@fortawesome/fontawesome-free": {
-      "version": "6.5.1",
-      "resolved": "https://registry.npmjs.org/@fortawesome/fontawesome-free/-/fontawesome-free-6.5.1.tgz",
-      "integrity": "sha512-CNy5vSwN3fsUStPRLX7fUYojyuzoEMSXPl7zSLJ8TgtRfjv24LOnOWKT2zYwaHZCJGkdyRnTmstR0P+Ah503Gw==",
+      "version": "6.6.0",
+      "resolved": "https://registry.npmjs.org/@fortawesome/fontawesome-free/-/fontawesome-free-6.6.0.tgz",
+      "integrity": "sha512-60G28ke/sXdtS9KZCpZSHHkCbdsOGEhIUGlwq6yhY74UpTiToIh8np7A8yphhM4BWsvNFtIvLpi4co+h9Mr9Ow==",
       "dev": true,
-      "hasInstallScript": true,
+      "license": "(CC-BY-4.0 AND OFL-1.1 AND MIT)",
       "engines": {
         "node": ">=6"
       }
@@ -203,6 +203,19 @@
         "url": "https://opencollective.com/popperjs"
       }
     },
+    "node_modules/@sindresorhus/merge-streams": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@sindresorhus/merge-streams/-/merge-streams-2.3.0.tgz",
+      "integrity": "sha512-LtoMMhxAlorcGhmFYI+LhPgbPZCkgP6ra1YL604EeF6U98pLlQ3iWIGMdWSC+vWmPBWBNgmDBAhnAobLROJmwg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/@types/json5": {
       "version": "0.0.29",
       "resolved": "https://registry.npmjs.org/@types/json5/-/json5-0.0.29.tgz",
@@ -327,15 +340,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/array-union": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
-      "integrity": "sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==",
-      "dev": true,
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/array.prototype.findlastindex": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/array.prototype.findlastindex/-/array.prototype.findlastindex-1.2.3.tgz",
@@ -412,19 +416,10 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/at-least-node": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/at-least-node/-/at-least-node-1.0.0.tgz",
-      "integrity": "sha512-+q/t7Ekv1EDY2l6Gda6LLiX14rU9TV20Wa3ofeQmwPFZbOMo9DXrLbOjFaaclkXKWidIaopwAObQDqwWtGUjqg==",
-      "dev": true,
-      "engines": {
-        "node": ">= 4.0.0"
-      }
-    },
     "node_modules/autoprefixer": {
-      "version": "10.4.16",
-      "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-10.4.16.tgz",
-      "integrity": "sha512-7vd3UC6xKp0HLfua5IjZlcXvGAGy7cBAXTg2lyQ/8WpNhd6SiZ8Be+xm3FyBSYJx5GKcpRCzBh7RH4/0dnY+uQ==",
+      "version": "10.4.20",
+      "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-10.4.20.tgz",
+      "integrity": "sha512-XY25y5xSv/wEoqzDyXXME4AFfkZI0P23z6Fs3YgymDnKJkCGOnkL0iTxCa85UTqaSgfcqyf3UA6+c7wUvx/16g==",
       "dev": true,
       "funding": [
         {
@@ -440,12 +435,13 @@
           "url": "https://github.com/sponsors/ai"
         }
       ],
+      "license": "MIT",
       "dependencies": {
-        "browserslist": "^4.21.10",
-        "caniuse-lite": "^1.0.30001538",
-        "fraction.js": "^4.3.6",
+        "browserslist": "^4.23.3",
+        "caniuse-lite": "^1.0.30001646",
+        "fraction.js": "^4.3.7",
         "normalize-range": "^0.1.2",
-        "picocolors": "^1.0.0",
+        "picocolors": "^1.0.1",
         "postcss-value-parser": "^4.2.0"
       },
       "bin": {
@@ -516,21 +512,22 @@
       }
     },
     "node_modules/braces": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
-      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.3.tgz",
+      "integrity": "sha512-yQbXgO/OSZVD2IsiLlro+7Hf6Q18EJrKSEsdoMzKePKXct3gvD8oLcOQdIzGupr5Fj+EDe8gO/lxc1BzfMpxvA==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
-        "fill-range": "^7.0.1"
+        "fill-range": "^7.1.1"
       },
       "engines": {
         "node": ">=8"
       }
     },
     "node_modules/browserslist": {
-      "version": "4.22.2",
-      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.22.2.tgz",
-      "integrity": "sha512-0UgcrvQmBDvZHFGdYUehrCNIazki7/lUP3kkoi/r3YB2amZbFM9J43ZRkJTXBUZK4gmx56+Sqk9+Vs9mwZx9+A==",
+      "version": "4.24.0",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.24.0.tgz",
+      "integrity": "sha512-Rmb62sR1Zpjql25eSanFGEhAxcFwfA1K0GuQcLoaJBAcENegrQut3hYdhXFF1obQfiDyqIW/cLM5HSJ/9k884A==",
       "dev": true,
       "funding": [
         {
@@ -546,11 +543,12 @@
           "url": "https://github.com/sponsors/ai"
         }
       ],
+      "license": "MIT",
       "dependencies": {
-        "caniuse-lite": "^1.0.30001565",
-        "electron-to-chromium": "^1.4.601",
-        "node-releases": "^2.0.14",
-        "update-browserslist-db": "^1.0.13"
+        "caniuse-lite": "^1.0.30001663",
+        "electron-to-chromium": "^1.5.28",
+        "node-releases": "^2.0.18",
+        "update-browserslist-db": "^1.1.0"
       },
       "bin": {
         "browserslist": "cli.js"
@@ -607,9 +605,9 @@
       }
     },
     "node_modules/caniuse-lite": {
-      "version": "1.0.30001576",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001576.tgz",
-      "integrity": "sha512-ff5BdakGe2P3SQsMsiqmt1Lc8221NR1VzHj5jXN5vBny9A6fpze94HiVV/n7XRosOlsShJcvMv5mdnpjOGCEgg==",
+      "version": "1.0.30001667",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001667.tgz",
+      "integrity": "sha512-7LTwJjcRkzKFmtqGsibMeuXmvFDfZq/nzIjnmgCGzKKRVzjD72selLDK1oPF/Oxzmt4fNcPvTDvGqSDG4tCALw==",
       "dev": true,
       "funding": [
         {
@@ -624,7 +622,8 @@
           "type": "github",
           "url": "https://github.com/sponsors/ai"
         }
-      ]
+      ],
+      "license": "CC-BY-4.0"
     },
     "node_modules/chalk": {
       "version": "4.1.2",
@@ -688,14 +687,18 @@
       "dev": true
     },
     "node_modules/cliui": {
-      "version": "7.0.4",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
-      "integrity": "sha512-OcRE68cOsVMXp1Yvonl/fzkQOyjLSu/8bhPDfQt0e0/Eb283TKP20Fs2MqoPsr9SwA595rRCA+QMzYc9nBP+JQ==",
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
+      "integrity": "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==",
       "dev": true,
+      "license": "ISC",
       "dependencies": {
         "string-width": "^4.2.0",
-        "strip-ansi": "^6.0.0",
+        "strip-ansi": "^6.0.1",
         "wrap-ansi": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
       }
     },
     "node_modules/color-convert": {
@@ -1313,26 +1316,15 @@
       }
     },
     "node_modules/dependency-graph": {
-      "version": "0.9.0",
-      "resolved": "https://registry.npmjs.org/dependency-graph/-/dependency-graph-0.9.0.tgz",
-      "integrity": "sha512-9YLIBURXj4DJMFALxXw9K3Y3rwb5Fk0X5/8ipCzaN84+gKxoHK43tVKRNakCQbiEx07E8Uwhuq21BpUagFhZ8w==",
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/dependency-graph/-/dependency-graph-0.11.0.tgz",
+      "integrity": "sha512-JeMq7fEshyepOWDfcfHK06N3MhyPhz++vtqWhMT5O9A3K42rdsEDpfdVqjaqaAhsw6a+ZqeDvQVtD0hFHQWrzg==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">= 0.6.0"
       }
     },
-    "node_modules/dir-glob": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/dir-glob/-/dir-glob-3.0.1.tgz",
-      "integrity": "sha512-WkrWp9GR4KXfKGYzOLmTuGVi1UWFfws377n9cc55/tb6DuqyF6pcQ5AbiHEshaDpY9v6oaSr2XCDidGmMwdzIA==",
-      "dev": true,
-      "dependencies": {
-        "path-type": "^4.0.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/doctrine": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
@@ -1352,10 +1344,11 @@
       "dev": true
     },
     "node_modules/electron-to-chromium": {
-      "version": "1.4.630",
-      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.630.tgz",
-      "integrity": "sha512-osHqhtjojpCsACVnuD11xO5g9xaCyw7Qqn/C2KParkMv42i8jrJJgx3g7mkHfpxwhy9MnOJr8+pKOdZ7qzgizg==",
-      "dev": true
+      "version": "1.5.32",
+      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.32.tgz",
+      "integrity": "sha512-M+7ph0VGBQqqpTT2YrabjNKSQ2fEl9PVx6AK3N558gDH9NO8O6XN9SXXFWRo9u9PbEg/bWq+tjXQr+eXmxubCw==",
+      "dev": true,
+      "license": "ISC"
     },
     "node_modules/elkjs": {
       "version": "0.8.2",
@@ -1367,7 +1360,8 @@
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
       "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
-      "dev": true
+      "dev": true,
+      "license": "MIT"
     },
     "node_modules/es-abstract": {
       "version": "1.22.3",
@@ -1463,10 +1457,11 @@
       }
     },
     "node_modules/escalade": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
-      "integrity": "sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
+      "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">=6"
       }
@@ -1912,6 +1907,7 @@
       "resolved": "https://registry.npmjs.org/fast-glob/-/fast-glob-3.3.2.tgz",
       "integrity": "sha512-oX2ruAFQwf/Orj8m737Y5adxDQO0LAB7/S5MnxCdTNDd4p6BsyIVsv9JQsATbTSq8KHRpLwIHbVlUNatxd+1Ow==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "@nodelib/fs.stat": "^2.0.2",
         "@nodelib/fs.walk": "^1.2.3",
@@ -1928,6 +1924,7 @@
       "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-5.1.2.tgz",
       "integrity": "sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow==",
       "dev": true,
+      "license": "ISC",
       "dependencies": {
         "is-glob": "^4.0.1"
       },
@@ -1985,10 +1982,11 @@
       }
     },
     "node_modules/fill-range": {
-      "version": "7.0.1",
-      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
-      "integrity": "sha512-qOo9F+dMUmC2Lcb4BbVvnKJxTPjCm+RRpe4gDuGrzkL7mEVl/djYSu2OdQ2Pa302N4oqkSg9ir6jaLWJ2USVpQ==",
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.1.1.tgz",
+      "integrity": "sha512-YsGpe3WHLK8ZYi4tWDg2Jy3ebRz2rXowDxnld4bkQB00cc/1Zw9AWnC0i9ztDJitivtQvaI9KaLyKrc+hBW0yg==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "to-regex-range": "^5.0.1"
       },
@@ -2037,12 +2035,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/flag-icon-css": {
-      "version": "4.1.7",
-      "resolved": "https://registry.npmjs.org/flag-icon-css/-/flag-icon-css-4.1.7.tgz",
-      "integrity": "sha512-AFjSU+fv98XbU0vnTQ32vcLj89UEr1MhwDFcooQv14qWJCjg9fGZzfh9BVyDhAhIOZW/pGmJmq38RqpgPaeybQ==",
-      "deprecated": "The project has been renamed to flag-icons",
-      "dev": true
+    "node_modules/flag-icons": {
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/flag-icons/-/flag-icons-7.2.3.tgz",
+      "integrity": "sha512-X2gUdteNuqdNqob2KKTJTS+ZCvyWeLCtDz9Ty8uJP17Y4o82Y+U/Vd4JNrdwTAjagYsRznOn9DZ+E/Q52qbmqg==",
+      "dev": true,
+      "license": "MIT"
     },
     "node_modules/flat-cache": {
       "version": "3.2.0",
@@ -2087,18 +2085,18 @@
       }
     },
     "node_modules/fs-extra": {
-      "version": "9.1.0",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-9.1.0.tgz",
-      "integrity": "sha512-hcg3ZmepS30/7BSFqRvoo3DOMQu7IjqxO5nCDt+zM9XWjb33Wg7ziNT+Qvqbuc3+gWpzO02JubVyk2G4Zvo1OQ==",
+      "version": "11.2.0",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-11.2.0.tgz",
+      "integrity": "sha512-PmDi3uwK5nFuXh7XDTlVnS17xJS7vW36is2+w3xcv8SVxiB4NyATf4ctkVY5bkSjX0Y4nbvZCq1/EjtEyr9ktw==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
-        "at-least-node": "^1.0.0",
         "graceful-fs": "^4.2.0",
         "jsonfile": "^6.0.1",
         "universalify": "^2.0.0"
       },
       "engines": {
-        "node": ">=10"
+        "node": ">=14.14"
       }
     },
     "node_modules/fs.realpath": {
@@ -2171,6 +2169,7 @@
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
       "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
       "dev": true,
+      "license": "ISC",
       "engines": {
         "node": "6.* || 8.* || >= 10.*"
       }
@@ -2191,12 +2190,13 @@
       }
     },
     "node_modules/get-stdin": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-8.0.0.tgz",
-      "integrity": "sha512-sY22aA6xchAzprjyqmSEQv4UbAAzRN0L2dQB0NlN5acTTK9Don6nhoc3eAbUnpZiCANAMfd/+40kVdKfFygohg==",
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-9.0.0.tgz",
+      "integrity": "sha512-dVKBjfWisLAicarI2Sf+JuBE/DghV4UzNAVe9yhEJuzeREd3JhOTE9cUaJTeSa77fsbQUK3pcOpJfM59+VKZaA==",
       "dev": true,
+      "license": "MIT",
       "engines": {
-        "node": ">=10"
+        "node": ">=12"
       },
       "funding": {
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+      "license": "ISC",
+      "bin": {
+        "yaml": "bin.mjs"
+      },
       "engines": {
-        "node": ">= 6"
+        "node": ">= 14"
       }
     },
     "node_modules/yargs": {
-      "version": "16.2.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",
-      "integrity": "sha512-D1mvvtDG0L5ft/jGWkLpG1+m0eQxOfaBvTNELraWj22wSVUMWxZUvYgJYcKh6jGGIkJFhH4IZPQhR4TKpc8mBw==",
+      "version": "17.7.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
+      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
-        "cliui": "^7.0.2",
+        "cliui": "^8.0.1",
         "escalade": "^3.1.1",
         "get-caller-file": "^2.0.5",
         "require-directory": "^2.1.1",
-        "string-width": "^4.2.0",
+        "string-width": "^4.2.3",
         "y18n": "^5.0.5",
-        "yargs-parser": "^20.2.2"
+        "yargs-parser": "^21.1.1"
       },
       "engines": {
-        "node": ">=10"
+        "node": ">=12"
       }
     },
     "node_modules/yargs-parser": {
-      "version": "20.2.9",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.9.tgz",
-      "integrity": "sha512-y11nGElTIV+CT3Zv9t7VKl+Q3hTQoT9a1Qzezhhl6Rp21gJ/IVTW7Z3y9EWXhuUBC2Shnf+DX0antecpAwSP8w==",
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
       "dev": true,
+      "license": "ISC",
       "engines": {
-        "node": ">=10"
+        "node": ">=12"
       }
     },
     "node_modules/yocto-queue": {
diff --git a/package.json b/package.json
index 8a02a20..0376360 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
       "eslint-plugin-promise": "github.com/hugo-toha/toha/v4",
       "feather-icons": "github.com/hugo-toha/toha/v4",
       "filterizr": "github.com/hugo-toha/toha/v4",
-      "flag-icon-css": "github.com/hugo-toha/toha/v4",
+      "flag-icons": "github.com/hugo-toha/toha/v4",
       "fuse.js": "github.com/hugo-toha/toha/v4",
       "highlight.js": "github.com/hugo-toha/toha/v4",
       "imagesloaded": "github.com/hugo-toha/toha/v4",
@@ -33,8 +33,8 @@
   "dependencies": {},
   "devDependencies": {
     "@fontsource/mulish": "4.5.13",
-    "@fortawesome/fontawesome-free": "^6.2.0",
-    "autoprefixer": "^10.4.13",
+    "@fortawesome/fontawesome-free": "^6.6.0",
+    "autoprefixer": "^10.4.20",
     "bootstrap": "^5.3.3",
     "eslint": "^8.31.0",
     "eslint-config-prettier": "^8.6.0",
@@ -45,19 +45,19 @@
     "eslint-plugin-promise": "^6.1.1",
     "feather-icons": "^4.29.1",
     "filterizr": "^2.2.4",
-    "flag-icon-css": "^4.1.7",
+    "flag-icons": "^7.2.3",
     "fuse.js": "^6.6.2",
     "highlight.js": "^11.6.0",
     "imagesloaded": "^5.0.0",
     "include-media": "^1.4.10",
     "ityped": "^1.0.3",
-    "katex": "^0.16.10",
+    "katex": "^0.16.11",
     "mark.js": "^8.11.1",
     "mermaid": "^9.2.1",
     "plyr": "^3.7.2",
     "popper.js": "^1.16.1",
-    "postcss": "^8.4.31",
-    "postcss-cli": "^8.3.1"
+    "postcss": "^8.4.41",
+    "postcss-cli": "^11.0.0"
   },
   "name": "korhonen.cc",
   "version": "0.1.0"