diff --git a/package-lock.json b/package-lock.json
index ce1943f..f4c704f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "@fontsource/roboto": "^4.5.8",
         "@iconify/json": "^2.2.25",
         "@iconify/vue2": "^2.1.0",
-        "@vuepress/plugin-pwa": "^1.9.8",
+        "@vuepress/plugin-pwa": "^1.9.9",
         "fs-extra": "^11.1.0",
         "vuepress": "^1.9.8",
         "vuepress-plugin-sitemap": "^2.3.1",
@@ -2474,17 +2474,59 @@
       }
     },
     "node_modules/@vuepress/plugin-pwa": {
-      "version": "1.9.8",
-      "resolved": "https://registry.npmjs.org/@vuepress/plugin-pwa/-/plugin-pwa-1.9.8.tgz",
-      "integrity": "sha512-XQRLZNTUi9S7Gieo92K9FBxMPCIxJ8gx+i7MFiLnn39todjDtjUC1buuN9vuu3cKbNqUPDhu68g1D9qhDIK+kQ==",
+      "version": "1.9.9",
+      "resolved": "https://registry.npmjs.org/@vuepress/plugin-pwa/-/plugin-pwa-1.9.9.tgz",
+      "integrity": "sha512-69kTlTl/mdWSD/+odz73oXvi2SuT8GO+e7YlPZFloeZR3kffC6ywYMip6m4MOalKOSUf0XzD3hCqCNVha6vo8Q==",
       "dev": true,
       "dependencies": {
-        "@vuepress/shared-utils": "1.9.8",
-        "@vuepress/types": "1.9.8",
+        "@vuepress/shared-utils": "1.9.9",
+        "@vuepress/types": "1.9.9",
         "register-service-worker": "^1.7.0",
         "workbox-build": "^4.3.1"
       }
     },
+    "node_modules/@vuepress/plugin-pwa/node_modules/@vuepress/shared-utils": {
+      "version": "1.9.9",
+      "resolved": "https://registry.npmjs.org/@vuepress/shared-utils/-/shared-utils-1.9.9.tgz",
+      "integrity": "sha512-qhk/7QF5LgMEXhEB1hlqreGFgkz4p2pmaBBNFxnAnYmSwmyO+u/oFOpZLI16QRx9Wg6ekR2ENmByQLxV7y4lJg==",
+      "dev": true,
+      "dependencies": {
+        "chalk": "^2.3.2",
+        "escape-html": "^1.0.3",
+        "fs-extra": "^7.0.1",
+        "globby": "^9.2.0",
+        "gray-matter": "^4.0.1",
+        "hash-sum": "^1.0.2",
+        "semver": "^6.0.0",
+        "toml": "^3.0.0",
+        "upath": "^1.1.0"
+      }
+    },
+    "node_modules/@vuepress/plugin-pwa/node_modules/@vuepress/types": {
+      "version": "1.9.9",
+      "resolved": "https://registry.npmjs.org/@vuepress/types/-/types-1.9.9.tgz",
+      "integrity": "sha512-ukGW49ILzLhIc7CltHMr+BeIjWKloJNN1mrvbDz3beycp9b9kgH+DXNdRIK9QCKr4fJsy7x08vNMwZr9Nq/PTQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/markdown-it": "^10.0.0",
+        "@types/webpack-dev-server": "^3",
+        "webpack-chain": "^6.0.0"
+      }
+    },
+    "node_modules/@vuepress/plugin-pwa/node_modules/fs-extra": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-7.0.1.tgz",
+      "integrity": "sha512-YJDaCJZEnBmcbw13fvdAM9AwNOJwOzrE4pqMqBq5nFiEqXUqHwlK4B+3pUw6JNvfSPtX05xFHtYy/1ni01eGCw==",
+      "dev": true,
+      "dependencies": {
+        "graceful-fs": "^4.1.2",
+        "jsonfile": "^4.0.0",
+        "universalify": "^0.1.0"
+      },
+      "engines": {
+        "node": ">=6 <7 || >=8"
+      }
+    },
     "node_modules/@vuepress/plugin-register-components": {
       "version": "1.9.8",
       "resolved": "https://registry.npmjs.org/@vuepress/plugin-register-components/-/plugin-register-components-1.9.8.tgz",
@@ -17443,15 +17485,56 @@
       }
     },
     "@vuepress/plugin-pwa": {
-      "version": "1.9.8",
-      "resolved": "https://registry.npmjs.org/@vuepress/plugin-pwa/-/plugin-pwa-1.9.8.tgz",
-      "integrity": "sha512-XQRLZNTUi9S7Gieo92K9FBxMPCIxJ8gx+i7MFiLnn39todjDtjUC1buuN9vuu3cKbNqUPDhu68g1D9qhDIK+kQ==",
+      "version": "1.9.9",
+      "resolved": "https://registry.npmjs.org/@vuepress/plugin-pwa/-/plugin-pwa-1.9.9.tgz",
+      "integrity": "sha512-69kTlTl/mdWSD/+odz73oXvi2SuT8GO+e7YlPZFloeZR3kffC6ywYMip6m4MOalKOSUf0XzD3hCqCNVha6vo8Q==",
       "dev": true,
       "requires": {
-        "@vuepress/shared-utils": "1.9.8",
-        "@vuepress/types": "1.9.8",
+        "@vuepress/shared-utils": "1.9.9",
+        "@vuepress/types": "1.9.9",
         "register-service-worker": "^1.7.0",
         "workbox-build": "^4.3.1"
+      },
+      "dependencies": {
+        "@vuepress/shared-utils": {
+          "version": "1.9.9",
+          "resolved": "https://registry.npmjs.org/@vuepress/shared-utils/-/shared-utils-1.9.9.tgz",
+          "integrity": "sha512-qhk/7QF5LgMEXhEB1hlqreGFgkz4p2pmaBBNFxnAnYmSwmyO+u/oFOpZLI16QRx9Wg6ekR2ENmByQLxV7y4lJg==",
+          "dev": true,
+          "requires": {
+            "chalk": "^2.3.2",
+            "escape-html": "^1.0.3",
+            "fs-extra": "^7.0.1",
+            "globby": "^9.2.0",
+            "gray-matter": "^4.0.1",
+            "hash-sum": "^1.0.2",
+            "semver": "^6.0.0",
+            "toml": "^3.0.0",
+            "upath": "^1.1.0"
+          }
+        },
+        "@vuepress/types": {
+          "version": "1.9.9",
+          "resolved": "https://registry.npmjs.org/@vuepress/types/-/types-1.9.9.tgz",
+          "integrity": "sha512-ukGW49ILzLhIc7CltHMr+BeIjWKloJNN1mrvbDz3beycp9b9kgH+DXNdRIK9QCKr4fJsy7x08vNMwZr9Nq/PTQ==",
+          "dev": true,
+          "requires": {
+            "@types/markdown-it": "^10.0.0",
+            "@types/webpack-dev-server": "^3",
+            "webpack-chain": "^6.0.0"
+          }
+        },
+        "fs-extra": {
+          "version": "7.0.1",
+          "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-7.0.1.tgz",
+          "integrity": "sha512-YJDaCJZEnBmcbw13fvdAM9AwNOJwOzrE4pqMqBq5nFiEqXUqHwlK4B+3pUw6JNvfSPtX05xFHtYy/1ni01eGCw==",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.1.2",
+            "jsonfile": "^4.0.0",
+            "universalify": "^0.1.0"
+          }
+        }
       }
     },
     "@vuepress/plugin-register-components": {
diff --git a/package.json b/package.json
index 1873f6d..d03d3c3 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
     "@fontsource/roboto": "^4.5.8",
     "@iconify/json": "^2.2.25",
     "@iconify/vue2": "^2.1.0",
-    "@vuepress/plugin-pwa": "^1.9.8",
+    "@vuepress/plugin-pwa": "^1.9.9",
     "fs-extra": "^11.1.0",
     "vuepress": "^1.9.8",
     "vuepress-plugin-sitemap": "^2.3.1",
diff --git a/yarn.lock b/yarn.lock
index cec8f62..47bda51 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1285,13 +1285,13 @@
     "@vuepress/types" "1.9.8"
     nprogress "^0.2.0"
 
-"@vuepress/plugin-pwa@^1.9.8":
-  version "1.9.8"
-  resolved "https://registry.yarnpkg.com/@vuepress/plugin-pwa/-/plugin-pwa-1.9.8.tgz#18823248553479e006799c24d88a2aab387c6421"
-  integrity sha512-XQRLZNTUi9S7Gieo92K9FBxMPCIxJ8gx+i7MFiLnn39todjDtjUC1buuN9vuu3cKbNqUPDhu68g1D9qhDIK+kQ==
+"@vuepress/plugin-pwa@^1.9.9":
+  version "1.9.9"
+  resolved "https://registry.yarnpkg.com/@vuepress/plugin-pwa/-/plugin-pwa-1.9.9.tgz#7e8dc0ce9081552c840d3ced02a0bbb52d730c5b"
+  integrity sha512-69kTlTl/mdWSD/+odz73oXvi2SuT8GO+e7YlPZFloeZR3kffC6ywYMip6m4MOalKOSUf0XzD3hCqCNVha6vo8Q==
   dependencies:
-    "@vuepress/shared-utils" "1.9.8"
-    "@vuepress/types" "1.9.8"
+    "@vuepress/shared-utils" "1.9.9"
+    "@vuepress/types" "1.9.9"
     register-service-worker "^1.7.0"
     workbox-build "^4.3.1"
 
@@ -1325,6 +1325,21 @@
     toml "^3.0.0"
     upath "^1.1.0"
 
+"@vuepress/shared-utils@1.9.9":
+  version "1.9.9"
+  resolved "https://registry.yarnpkg.com/@vuepress/shared-utils/-/shared-utils-1.9.9.tgz#f6561ec2264d54e4e459d17678766ffe09f4bfc6"
+  integrity sha512-qhk/7QF5LgMEXhEB1hlqreGFgkz4p2pmaBBNFxnAnYmSwmyO+u/oFOpZLI16QRx9Wg6ekR2ENmByQLxV7y4lJg==
+  dependencies:
+    chalk "^2.3.2"
+    escape-html "^1.0.3"
+    fs-extra "^7.0.1"
+    globby "^9.2.0"
+    gray-matter "^4.0.1"
+    hash-sum "^1.0.2"
+    semver "^6.0.0"
+    toml "^3.0.0"
+    upath "^1.1.0"
+
 "@vuepress/theme-default@1.9.8":
   version "1.9.8"
   resolved "https://registry.yarnpkg.com/@vuepress/theme-default/-/theme-default-1.9.8.tgz#303ed3c73e37c3821e6447f90ead2e5629856560"
@@ -1350,6 +1365,15 @@
     "@types/webpack-dev-server" "^3"
     webpack-chain "^6.0.0"
 
+"@vuepress/types@1.9.9":
+  version "1.9.9"
+  resolved "https://registry.yarnpkg.com/@vuepress/types/-/types-1.9.9.tgz#7c21e4c91c13e58e2ff303ded9ad7425805cb07d"
+  integrity sha512-ukGW49ILzLhIc7CltHMr+BeIjWKloJNN1mrvbDz3beycp9b9kgH+DXNdRIK9QCKr4fJsy7x08vNMwZr9Nq/PTQ==
+  dependencies:
+    "@types/markdown-it" "^10.0.0"
+    "@types/webpack-dev-server" "^3"
+    webpack-chain "^6.0.0"
+
 "@webassemblyjs/ast@1.9.0":
   version "1.9.0"
   resolved "https://registry.yarnpkg.com/@webassemblyjs/ast/-/ast-1.9.0.tgz#bd850604b4042459a5a41cd7d338cbed695ed964"