diff --git a/package-lock.json b/package-lock.json
index 2b024960724..5746788c1c9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "hasInstallScript": true,
       "license": "Apache-2.0",
       "dependencies": {
-        "jsdom": "20.0.3"
+        "jsdom": "21.0.0"
       },
       "devDependencies": {
         "@blockly/block-test": "^3.0.0",
@@ -2718,6 +2718,52 @@
         "jsdom": "20.0.3"
       }
     },
+    "node_modules/blockly/node_modules/jsdom": {
+      "version": "20.0.3",
+      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-20.0.3.tgz",
+      "integrity": "sha512-SYhBvTh89tTfCD/CRdSOm13mOBa42iTaTyfyEWBdKcGdPxPtLFBXuHR8XHb33YNYaP+lLbmSvBTsnoesCNJEsQ==",
+      "dev": true,
+      "peer": true,
+      "dependencies": {
+        "abab": "^2.0.6",
+        "acorn": "^8.8.1",
+        "acorn-globals": "^7.0.0",
+        "cssom": "^0.5.0",
+        "cssstyle": "^2.3.0",
+        "data-urls": "^3.0.2",
+        "decimal.js": "^10.4.2",
+        "domexception": "^4.0.0",
+        "escodegen": "^2.0.0",
+        "form-data": "^4.0.0",
+        "html-encoding-sniffer": "^3.0.0",
+        "http-proxy-agent": "^5.0.0",
+        "https-proxy-agent": "^5.0.1",
+        "is-potential-custom-element-name": "^1.0.1",
+        "nwsapi": "^2.2.2",
+        "parse5": "^7.1.1",
+        "saxes": "^6.0.0",
+        "symbol-tree": "^3.2.4",
+        "tough-cookie": "^4.1.2",
+        "w3c-xmlserializer": "^4.0.0",
+        "webidl-conversions": "^7.0.0",
+        "whatwg-encoding": "^2.0.0",
+        "whatwg-mimetype": "^3.0.0",
+        "whatwg-url": "^11.0.0",
+        "ws": "^8.11.0",
+        "xml-name-validator": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "peerDependencies": {
+        "canvas": "^2.5.0"
+      },
+      "peerDependenciesMeta": {
+        "canvas": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -7568,9 +7614,9 @@
       }
     },
     "node_modules/jsdom": {
-      "version": "20.0.3",
-      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-20.0.3.tgz",
-      "integrity": "sha512-SYhBvTh89tTfCD/CRdSOm13mOBa42iTaTyfyEWBdKcGdPxPtLFBXuHR8XHb33YNYaP+lLbmSvBTsnoesCNJEsQ==",
+      "version": "21.0.0",
+      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-21.0.0.tgz",
+      "integrity": "sha512-AIw+3ZakSUtDYvhwPwWHiZsUi3zHugpMEKlNPaurviseYoBqo0zBd3zqoUi3LPCNtPFlEP8FiW9MqCZdjb2IYA==",
       "dependencies": {
         "abab": "^2.0.6",
         "acorn": "^8.8.1",
@@ -14930,6 +14976,43 @@
       "peer": true,
       "requires": {
         "jsdom": "20.0.3"
+      },
+      "dependencies": {
+        "jsdom": {
+          "version": "20.0.3",
+          "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-20.0.3.tgz",
+          "integrity": "sha512-SYhBvTh89tTfCD/CRdSOm13mOBa42iTaTyfyEWBdKcGdPxPtLFBXuHR8XHb33YNYaP+lLbmSvBTsnoesCNJEsQ==",
+          "dev": true,
+          "peer": true,
+          "requires": {
+            "abab": "^2.0.6",
+            "acorn": "^8.8.1",
+            "acorn-globals": "^7.0.0",
+            "cssom": "^0.5.0",
+            "cssstyle": "^2.3.0",
+            "data-urls": "^3.0.2",
+            "decimal.js": "^10.4.2",
+            "domexception": "^4.0.0",
+            "escodegen": "^2.0.0",
+            "form-data": "^4.0.0",
+            "html-encoding-sniffer": "^3.0.0",
+            "http-proxy-agent": "^5.0.0",
+            "https-proxy-agent": "^5.0.1",
+            "is-potential-custom-element-name": "^1.0.1",
+            "nwsapi": "^2.2.2",
+            "parse5": "^7.1.1",
+            "saxes": "^6.0.0",
+            "symbol-tree": "^3.2.4",
+            "tough-cookie": "^4.1.2",
+            "w3c-xmlserializer": "^4.0.0",
+            "webidl-conversions": "^7.0.0",
+            "whatwg-encoding": "^2.0.0",
+            "whatwg-mimetype": "^3.0.0",
+            "whatwg-url": "^11.0.0",
+            "ws": "^8.11.0",
+            "xml-name-validator": "^4.0.0"
+          }
+        }
       }
     },
     "brace-expansion": {
@@ -18789,9 +18872,9 @@
       "dev": true
     },
     "jsdom": {
-      "version": "20.0.3",
-      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-20.0.3.tgz",
-      "integrity": "sha512-SYhBvTh89tTfCD/CRdSOm13mOBa42iTaTyfyEWBdKcGdPxPtLFBXuHR8XHb33YNYaP+lLbmSvBTsnoesCNJEsQ==",
+      "version": "21.0.0",
+      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-21.0.0.tgz",
+      "integrity": "sha512-AIw+3ZakSUtDYvhwPwWHiZsUi3zHugpMEKlNPaurviseYoBqo0zBd3zqoUi3LPCNtPFlEP8FiW9MqCZdjb2IYA==",
       "requires": {
         "abab": "^2.0.6",
         "acorn": "^8.8.1",
diff --git a/package.json b/package.json
index a130fcac892..6b149e511be 100644
--- a/package.json
+++ b/package.json
@@ -113,6 +113,6 @@
     "yargs": "^17.2.1"
   },
   "dependencies": {
-    "jsdom": "20.0.3"
+    "jsdom": "21.0.0"
   }
 }