diff --git a/package-lock.json b/package-lock.json
index c7190f46a..bdef0e41c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -55,7 +55,7 @@
         "file-saver": "^2.0.5",
         "gl-matrix": "3.4.3",
         "globals": "^16.2.0",
-        "happy-dom": "^20.8.9",
+        "happy-dom": "^21.0.4",
         "itk-wasm": "^1.0.0-b.199",
         "jscpd": "5.1.2",
         "jszip": "3.10.1",
@@ -8562,6 +8562,19 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/buffer-image-size": {
+      "version": "0.6.4",
+      "resolved": "https://registry.npmjs.org/buffer-image-size/-/buffer-image-size-0.6.4.tgz",
+      "integrity": "sha512-nEh+kZOPY1w+gcCMobZ6ETUp9WfibndnosbpwB1iJk/8Gt5ZF2bhS6+B6bPYz424KtwsR6Rflc3tCz1/ghX2dQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      },
+      "engines": {
+        "node": ">=4.0"
+      }
+    },
     "node_modules/bytes": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
@@ -12690,18 +12703,19 @@
       }
     },
     "node_modules/happy-dom": {
-      "version": "20.9.0",
-      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-20.9.0.tgz",
-      "integrity": "sha512-GZZ9mKe8r646NUAf/zemnGbjYh4Bt8/MqASJY+pSm5ZDtc3YQox+4gsLI7yi1hba6o+eCsGxpHn5+iEVn31/FQ==",
+      "version": "21.0.4",
+      "resolved": "https://registry.npmjs.org/happy-dom/-/happy-dom-21.0.4.tgz",
+      "integrity": "sha512-tFm+GaLBgo6o0awHnvHaNoraVo27qJ+2tZEtZ+cIa08hXbeitrxAJajLI05hsUy/2/YTKcUjQYzHe5mCcraLBw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "@types/node": ">=20.0.0",
         "@types/whatwg-mimetype": "^3.0.2",
         "@types/ws": "^8.18.1",
+        "buffer-image-size": "^0.6.4",
         "entities": "^7.0.1",
         "whatwg-mimetype": "^3.0.0",
-        "ws": "^8.18.3"
+        "ws": "^8.21.0"
       },
       "engines": {
         "node": ">=20.0.0"
diff --git a/package.json b/package.json
index 2ad40f8b3..50b7b90b3 100644
--- a/package.json
+++ b/package.json
@@ -81,7 +81,7 @@
     "file-saver": "^2.0.5",
     "gl-matrix": "3.4.3",
     "globals": "^16.2.0",
-    "happy-dom": "^20.8.9",
+    "happy-dom": "^21.0.4",
     "itk-wasm": "^1.0.0-b.199",
     "jscpd": "5.1.2",
     "jszip": "3.10.1",