diff --git a/package-lock.json b/package-lock.json
index 44412a2..7bfc02a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,7 +25,7 @@
       },
       "devDependencies": {
         "@vitejs/plugin-basic-ssl": "^2.0.0",
-        "happy-dom": "^20.0.7",
+        "happy-dom": "^20.8.9",
         "jsdom": "^26.1.0",
         "vite": "^6.4.1",
         "vitest": "^3.1.2"
@@ -974,6 +974,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/ws": {
+      "version": "8.18.1",
+      "resolved": "https://registry.npmjs.org/@types/ws/-/ws-8.18.1.tgz",
+      "integrity": "sha512-ThVF6DCVhA8kUGy+aazFQ4kXQ7E1Ty7A3ypFOe0IcJV8O/M511G99AW24irKrW56Wt44yG9+ij8FaqoBGkuBXg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@vitejs/plugin-basic-ssl": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/@vitejs/plugin-basic-ssl/-/plugin-basic-ssl-2.0.0.tgz",
@@ -1316,20 +1326,36 @@
       }
     },
     "node_modules/happy-dom": {
-      "version": "20.0.7",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.0.7.tgz",
-      "integrity": "sha512-CywLfzmYxP5OYpuAG0usFY0CpxJtwYR+w8Mms5J8W29Y2Pzf6rbfQS2M523tRZTb0oLA+URopPtnAQX2fupHZQ==",
+      "version": "20.8.9",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.8.9.tgz",
+      "integrity": "sha512-Tz23LR9T9jOGVZm2x1EPdXqwA37G/owYMxRwU0E4miurAtFsPMQ1d2Jc2okUaSjZqAFz2oEn3FLXC5a0a+siyA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@types/node": "^20.0.0",
+        "@types/node": ">=20.0.0",
         "@types/whatwg-mimetype": "^3.0.2",
-        "whatwg-mimetype": "^3.0.0"
+        "@types/ws": "^8.18.1",
+        "entities": "^7.0.1",
+        "whatwg-mimetype": "^3.0.0",
+        "ws": "^8.18.3"
       },
       "engines": {
         "node": ">=20.0.0"
       }
     },
+    "node_modules/happy-dom/node_modules/entities": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-7.0.1.tgz",
+      "integrity": "sha512-TWrgLOFUQTH994YUyl1yT4uyavY5nNB5muff+RtWaqNVCAK408b5ZnnbNAUEWLTCpum9w6arT70i1XdQ4UeOPA==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
     "node_modules/html-encoding-sniffer": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-4.0.0.tgz",
@@ -2013,10 +2039,11 @@
       }
     },
     "node_modules/ws": {
-      "version": "8.18.1",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.1.tgz",
-      "integrity": "sha512-RKW2aJZMXeMxVpnZ6bck+RswznaxmzdULiBr6KY7XkTnW8uvt0iT9H5DkHUChXrc+uurzwa0rVI16n/Xzjdz1w==",
+      "version": "8.20.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.20.0.tgz",
+      "integrity": "sha512-sAt8BhgNbzCtgGbt2OxmpuryO63ZoDk/sqaB/znQm94T4fCEsy/yV+7CdC1kJhOU9lboAEU7R3kquuycDoibVA==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">=10.0.0"
       },
diff --git a/package.json b/package.json
index 1ebfc7f..261d25b 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
   "homepage": "https://github.com/catalystsquad/zest#README.md",
   "devDependencies": {
     "@vitejs/plugin-basic-ssl": "^2.0.0",
-    "happy-dom": "^20.0.7",
+    "happy-dom": "^20.8.9",
     "jsdom": "^26.1.0",
     "vite": "^6.4.1",
     "vitest": "^3.1.2"