diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3abaa44..b2318dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## UNRELEASED
 
+- Breaking Changes
+  - happy-dom to 15.11.6
+
 - Update (sub-)dependencies
   - cross-spawn to 7.0.6
   - micromatch to 4.0.8
diff --git a/package-lock.json b/package-lock.json
index 0c828c8..6cff6a7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,7 @@
         "eslint": "^8.36.0",
         "eslint-config-braintree": "^6.0.0-typescript-prep-rc.2",
         "eslint-plugin-prettier": "^4.2.1",
-        "happy-dom": "^10.10.4",
+        "happy-dom": "^15.11.6",
         "prettier": "^2.8.4",
         "typescript": "^5.1.6",
         "vitest": "^0.34.2"
@@ -1447,12 +1447,6 @@
         "node": ">= 8"
       }
     },
-    "node_modules/css.escape": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/css.escape/-/css.escape-1.5.1.tgz",
-      "integrity": "sha512-YUifsXXuknHlUsmlgyY0PKzgPOr7/FjCePfHNt0jxm83wHZi44VDMQ7/fGNkjY3/jV1MC+1CmZbaHzugyeRtpg==",
-      "dev": true
-    },
     "node_modules/debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
@@ -2059,17 +2053,18 @@
       "dev": true
     },
     "node_modules/happy-dom": {
-      "version": "10.11.2",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-10.11.2.tgz",
-      "integrity": "sha512-rzgmLjLkhyaOdFEyU8CWXzbgyCyM7wJHLqhaoeEVSTyur1fjcUaiNTHx+D4CPaLvx16tGy+SBPd9TVnP/kzL3w==",
+      "version": "15.11.6",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-15.11.6.tgz",
+      "integrity": "sha512-elX7iUTu+5+3b2+NGQc0L3eWyq9jKhuJJ4GpOMxxT/c2pg9O3L5H3ty2VECX0XXZgRmmRqXyOK8brA2hDI6LsQ==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
-        "css.escape": "^1.5.1",
         "entities": "^4.5.0",
-        "iconv-lite": "^0.6.3",
         "webidl-conversions": "^7.0.0",
-        "whatwg-encoding": "^2.0.0",
         "whatwg-mimetype": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=18.0.0"
       }
     },
     "node_modules/has-flag": {
@@ -2087,18 +2082,6 @@
       "integrity": "sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==",
       "dev": true
     },
-    "node_modules/iconv-lite": {
-      "version": "0.6.3",
-      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
-      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
-      "dev": true,
-      "dependencies": {
-        "safer-buffer": ">= 2.1.2 < 3.0.0"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/ignore": {
       "version": "5.2.4",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.2.4.tgz",
@@ -2895,12 +2878,6 @@
         "queue-microtask": "^1.2.2"
       }
     },
-    "node_modules/safer-buffer": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
-      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
-      "dev": true
-    },
     "node_modules/semver": {
       "version": "7.5.4",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
@@ -3368,18 +3345,6 @@
         "node": ">=12"
       }
     },
-    "node_modules/whatwg-encoding": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-2.0.0.tgz",
-      "integrity": "sha512-p41ogyeMUrw3jWclHWTQg1k05DSVXPLcVxRTYsXUk+ZooOCZLcoYgPZ/HL/D/N+uQPOtcp1me1WhBEaX02mhWg==",
-      "dev": true,
-      "dependencies": {
-        "iconv-lite": "0.6.3"
-      },
-      "engines": {
-        "node": ">=12"
-      }
-    },
     "node_modules/whatwg-mimetype": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-3.0.0.tgz",
@@ -4387,12 +4352,6 @@
         "which": "^2.0.1"
       }
     },
-    "css.escape": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/css.escape/-/css.escape-1.5.1.tgz",
-      "integrity": "sha512-YUifsXXuknHlUsmlgyY0PKzgPOr7/FjCePfHNt0jxm83wHZi44VDMQ7/fGNkjY3/jV1MC+1CmZbaHzugyeRtpg==",
-      "dev": true
-    },
     "debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
@@ -4840,16 +4799,13 @@
       "dev": true
     },
     "happy-dom": {
-      "version": "10.11.2",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-10.11.2.tgz",
-      "integrity": "sha512-rzgmLjLkhyaOdFEyU8CWXzbgyCyM7wJHLqhaoeEVSTyur1fjcUaiNTHx+D4CPaLvx16tGy+SBPd9TVnP/kzL3w==",
+      "version": "15.11.6",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-15.11.6.tgz",
+      "integrity": "sha512-elX7iUTu+5+3b2+NGQc0L3eWyq9jKhuJJ4GpOMxxT/c2pg9O3L5H3ty2VECX0XXZgRmmRqXyOK8brA2hDI6LsQ==",
       "dev": true,
       "requires": {
-        "css.escape": "^1.5.1",
         "entities": "^4.5.0",
-        "iconv-lite": "^0.6.3",
         "webidl-conversions": "^7.0.0",
-        "whatwg-encoding": "^2.0.0",
         "whatwg-mimetype": "^3.0.0"
       }
     },
@@ -4865,15 +4821,6 @@
       "integrity": "sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==",
       "dev": true
     },
-    "iconv-lite": {
-      "version": "0.6.3",
-      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
-      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
-      "dev": true,
-      "requires": {
-        "safer-buffer": ">= 2.1.2 < 3.0.0"
-      }
-    },
     "ignore": {
       "version": "5.2.4",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.2.4.tgz",
@@ -5437,12 +5384,6 @@
         "queue-microtask": "^1.2.2"
       }
     },
-    "safer-buffer": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
-      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
-      "dev": true
-    },
     "semver": {
       "version": "7.5.4",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
@@ -5729,15 +5670,6 @@
       "integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==",
       "dev": true
     },
-    "whatwg-encoding": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-2.0.0.tgz",
-      "integrity": "sha512-p41ogyeMUrw3jWclHWTQg1k05DSVXPLcVxRTYsXUk+ZooOCZLcoYgPZ/HL/D/N+uQPOtcp1me1WhBEaX02mhWg==",
-      "dev": true,
-      "requires": {
-        "iconv-lite": "0.6.3"
-      }
-    },
     "whatwg-mimetype": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-3.0.0.tgz",
diff --git a/package.json b/package.json
index e3c8123..a73d4c9 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "eslint": "^8.36.0",
     "eslint-config-braintree": "^6.0.0-typescript-prep-rc.2",
     "eslint-plugin-prettier": "^4.2.1",
-    "happy-dom": "^10.10.4",
+    "happy-dom": "^15.11.6",
     "prettier": "^2.8.4",
     "typescript": "^5.1.6",
     "vitest": "^0.34.2"