diff --git a/frontend/package.json b/frontend/package.json
index cd7217b7..ab07ec55 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -32,7 +32,7 @@
     "@open-wc/testing": "^4.0.0",
     "@rollup/plugin-node-resolve": "^15.3.0",
     "@rollup/plugin-terser": "^0.4.4",
-    "@types/chai": "^4.3.19",
+    "@types/chai": "^5.0.0",
     "@types/mocha": "^10.0.9",
     "@types/node": "^22.7.4",
     "@types/webstatus.dev-backend": "file:../lib/gen/openapi/ts-webstatus.dev-backend-types",
diff --git a/package-lock.json b/package-lock.json
index 099c739b..69fa31f5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -51,7 +51,7 @@
         "@open-wc/testing": "^4.0.0",
         "@rollup/plugin-node-resolve": "^15.3.0",
         "@rollup/plugin-terser": "^0.4.4",
-        "@types/chai": "^4.3.19",
+        "@types/chai": "^5.0.0",
         "@types/mocha": "^10.0.9",
         "@types/node": "^22.7.4",
         "@types/webstatus.dev-backend": "file:../lib/gen/openapi/ts-webstatus.dev-backend-types",
@@ -521,6 +521,12 @@
         "@types/chai": "^4.2.12"
       }
     },
+    "node_modules/@esm-bundle/chai/node_modules/@types/chai": {
+      "version": "4.3.20",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.3.20.tgz",
+      "integrity": "sha512-/pC9HAB5I/xMlc5FP77qjCnI16ChlJfW0tGa0IUcFn38VJrTV6DeZ60NU5KZBtaOZqjdpwTWohz5HU1RrhiYxQ==",
+      "dev": true
+    },
     "node_modules/@firebase/analytics": {
       "version": "0.10.8",
       "resolved": "https://registry.npmjs.org/@firebase/analytics/-/analytics-0.10.8.tgz",
@@ -1439,6 +1445,12 @@
         "@web/test-runner-commands": "^0.9.0"
       }
     },
+    "node_modules/@open-wc/semantic-dom-diff/node_modules/@types/chai": {
+      "version": "4.3.20",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.3.20.tgz",
+      "integrity": "sha512-/pC9HAB5I/xMlc5FP77qjCnI16ChlJfW0tGa0IUcFn38VJrTV6DeZ60NU5KZBtaOZqjdpwTWohz5HU1RrhiYxQ==",
+      "dev": true
+    },
     "node_modules/@open-wc/testing": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/@open-wc/testing/-/testing-4.0.0.tgz",
@@ -2079,9 +2091,9 @@
       }
     },
     "node_modules/@types/chai": {
-      "version": "4.3.19",
-      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.3.19.tgz",
-      "integrity": "sha512-2hHHvQBVE2FiSK4eN0Br6snX9MtolHaTo/batnLjlGRhoQzlCL61iVpxoqO7SfFyOw+P/pwv+0zNHzKoGWz9Cw==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.0.0.tgz",
+      "integrity": "sha512-+DwhEHAaFPPdJ2ral3kNHFQXnTfscEEFsUxzD+d7nlcLrFK23JtNjH71RGasTcHb88b4vVi4mTyfpf8u2L8bdA==",
       "dev": true
     },
     "node_modules/@types/chai-dom": {