diff --git a/package-lock.json b/package-lock.json
index c6a18ac..11069dd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4801,17 +4801,57 @@
       }
     },
     "gulp-purgecss": {
-      "version": "4.1.3",
-      "resolved": "https://registry.npmjs.org/gulp-purgecss/-/gulp-purgecss-4.1.3.tgz",
-      "integrity": "sha512-UjdUf5DBFig5mdZBiCM5VqMzUmu+cRaMfICSolmWfOO9d53g6n729Nvl7J/r3GC+hM1yeWj6QC1yT7f+p+OvXQ==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/gulp-purgecss/-/gulp-purgecss-5.0.0.tgz",
+      "integrity": "sha512-/s4bEI1JhwhCDrYu665rfJ/O9uMfAked3k6pQJlDC86JwJAUMXiMxfex6fV0WP36kRb+9ZTLVb6RC/DgfbS4/g==",
       "dev": true,
       "requires": {
-        "glob": "^7.1.6",
-        "plugin-error": "^1.0.1",
-        "purgecss": "^4.1.3",
+        "glob": "^8.0.3",
+        "plugin-error": "^2.0.0",
+        "purgecss": "^5.0.0",
         "through2": "^4.0.1"
       },
       "dependencies": {
+        "brace-expansion": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+          "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+          "dev": true,
+          "requires": {
+            "balanced-match": "^1.0.0"
+          }
+        },
+        "glob": {
+          "version": "8.0.3",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-8.0.3.tgz",
+          "integrity": "sha512-ull455NHSHI/Y1FqGaaYFaLGkNMMJbavMrEGFXG/PGrg6y7sutWHUHrz6gy6WEBH6akM1M414dWKCNs+IhKdiQ==",
+          "dev": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^5.0.1",
+            "once": "^1.3.0"
+          }
+        },
+        "minimatch": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.0.tgz",
+          "integrity": "sha512-9TPBGGak4nHfGZsPBohm9AWg6NoT7QTCehS3BIJABslyZbzxfV78QM2Y6+i741OPZIafFAaiiEMh5OyIrJPgtg==",
+          "dev": true,
+          "requires": {
+            "brace-expansion": "^2.0.1"
+          }
+        },
+        "plugin-error": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/plugin-error/-/plugin-error-2.0.0.tgz",
+          "integrity": "sha512-o4bwIOmuFwUg2MU6xt7plGEQY3YyENx6kvwaFZBrUpamA91FdS9w3U+pU0y4OuDoBQe+jf3RLGSfQebSRBEVsQ==",
+          "dev": true,
+          "requires": {
+            "ansi-colors": "^1.0.1"
+          }
+        },
         "readable-stream": {
           "version": "3.6.0",
           "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
@@ -8382,12 +8422,12 @@
       "integrity": "sha1-AerA/jta9xoqbAL+q7jB/vfgDqs="
     },
     "postcss": {
-      "version": "8.4.13",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.13.tgz",
-      "integrity": "sha512-jtL6eTBrza5MPzy8oJLFuUscHDXTV5KcLlqAWHl5q5WYRfnNRGSmOZmOZ1T6Gy7A99mOZfqungmZMpMmCVJ8ZA==",
+      "version": "8.4.16",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.16.tgz",
+      "integrity": "sha512-ipHE1XBvKzm5xI7hiHCZJCSugxvsdq2mPnsq5+UF+VHCjiBvtDrlxJfMBToWaP9D5XlgNmcFGqoHmUn0EYEaRQ==",
       "dev": true,
       "requires": {
-        "nanoid": "^3.3.3",
+        "nanoid": "^3.3.4",
         "picocolors": "^1.0.0",
         "source-map-js": "^1.0.2"
       }
@@ -8693,44 +8733,52 @@
       }
     },
     "purgecss": {
-      "version": "4.1.3",
-      "resolved": "https://registry.npmjs.org/purgecss/-/purgecss-4.1.3.tgz",
-      "integrity": "sha512-99cKy4s+VZoXnPxaoM23e5ABcP851nC2y2GROkkjS8eJaJtlciGavd7iYAw2V84WeBqggZ12l8ef44G99HmTaw==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/purgecss/-/purgecss-5.0.0.tgz",
+      "integrity": "sha512-RAnuxrGuVyLLTr8uMbKaxDRGWMgK5CCYDfRyUNNcaz5P3kGgD2b7ymQGYEyo2ST7Tl/ScwFgf5l3slKMxHSbrw==",
       "dev": true,
       "requires": {
-        "commander": "^8.0.0",
-        "glob": "^7.1.7",
-        "postcss": "^8.3.5",
-        "postcss-selector-parser": "^6.0.6"
+        "commander": "^9.0.0",
+        "glob": "^8.0.3",
+        "postcss": "^8.4.4",
+        "postcss-selector-parser": "^6.0.7"
       },
       "dependencies": {
+        "brace-expansion": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+          "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+          "dev": true,
+          "requires": {
+            "balanced-match": "^1.0.0"
+          }
+        },
         "commander": {
-          "version": "8.3.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz",
-          "integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==",
+          "version": "9.4.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-9.4.0.tgz",
+          "integrity": "sha512-sRPT+umqkz90UA8M1yqYfnHlZA7fF6nSphDtxeywPZ49ysjxDQybzk13CL+mXekDRG92skbcqCLVovuCusNmFw==",
           "dev": true
         },
         "glob": {
-          "version": "7.2.3",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
-          "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
+          "version": "8.0.3",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-8.0.3.tgz",
+          "integrity": "sha512-ull455NHSHI/Y1FqGaaYFaLGkNMMJbavMrEGFXG/PGrg6y7sutWHUHrz6gy6WEBH6akM1M414dWKCNs+IhKdiQ==",
           "dev": true,
           "requires": {
             "fs.realpath": "^1.0.0",
             "inflight": "^1.0.4",
             "inherits": "2",
-            "minimatch": "^3.1.1",
-            "once": "^1.3.0",
-            "path-is-absolute": "^1.0.0"
+            "minimatch": "^5.0.1",
+            "once": "^1.3.0"
           }
         },
         "minimatch": {
-          "version": "3.1.2",
-          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-          "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.0.tgz",
+          "integrity": "sha512-9TPBGGak4nHfGZsPBohm9AWg6NoT7QTCehS3BIJABslyZbzxfV78QM2Y6+i741OPZIafFAaiiEMh5OyIrJPgtg==",
           "dev": true,
           "requires": {
-            "brace-expansion": "^1.1.7"
+            "brace-expansion": "^2.0.1"
           }
         }
       }
diff --git a/package.json b/package.json
index 793c8a3..4dffcf6 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
     "@11ty/eleventy-navigation": "^0.3.5",
     "@11ty/eleventy-plugin-rss": "^1.2.0",
     "gulp-html-replace": "^1.6.2",
-    "gulp-purgecss": "^4.1.3",
+    "gulp-purgecss": "^5.0.0",
     "gulp-smushit": "^1.2.0",
     "imagemin": "^7.0.1",
     "imagemin-webp": "^7.0.0",