diff --git a/lit-element-ts-esbuild/package-lock.json b/lit-element-ts-esbuild/package-lock.json
index 5539d82f9..582062265 100644
--- a/lit-element-ts-esbuild/package-lock.json
+++ b/lit-element-ts-esbuild/package-lock.json
@@ -841,10 +841,13 @@
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-      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.18.63.tgz",
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-      "dev": true
+      "version": "20.17.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.17.2.tgz",
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+      "dev": true,
+      "requires": {
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+      }
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     "@types/parse5": {
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@@ -4485,6 +4488,12 @@
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       }
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+    "undici-types": {
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+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.19.8.tgz",
+      "integrity": "sha512-ve2KP6f/JnbPBFyobGHuerC9g1FYGn/F8n1LWTwNxCEzd6IfqTwUQcNXgEtmmQ6DlRrC1hrSrBnCZPokRrDHjw==",
+      "dev": true
+    },
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
diff --git a/lit-element-ts-esbuild/package.json b/lit-element-ts-esbuild/package.json
index 6bab4a1c2..fc74c31d8 100644
--- a/lit-element-ts-esbuild/package.json
+++ b/lit-element-ts-esbuild/package.json
@@ -21,7 +21,7 @@
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   "devDependencies": {
     "@open-wc/testing": "2.5.33",
-    "@types/node": "14.18.63",
+    "@types/node": "20.17.2",
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     "@web/dev-server-esbuild": "0.4.4",
     "@web/test-runner": "0.16.0",
diff --git a/lit-element-ts-tsc/package-lock.json b/lit-element-ts-tsc/package-lock.json
index 1debb85ec..9e56f94eb 100644
--- a/lit-element-ts-tsc/package-lock.json
+++ b/lit-element-ts-tsc/package-lock.json
@@ -681,10 +681,13 @@
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-      "version": "14.18.63",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.18.63.tgz",
-      "integrity": "sha512-fAtCfv4jJg+ExtXhvCkCqUKZ+4ok/JQk01qDKhL5BDDoS3AxKXhV5/MAVUZyQnSEd2GT92fkgZl0pz0Q0AzcIQ==",
-      "dev": true
+      "version": "20.17.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.17.2.tgz",
+      "integrity": "sha512-OOHK4sjXqkL7yQ7VEEHcf6+0jSvKjWqwnaCtY7AKD/VLEvRHMsxxu7eI8ErnjxHS8VwmekD4PeVCpu4qZEZSxg==",
+      "dev": true,
+      "requires": {
+        "undici-types": "~6.19.2"
+      }
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     "@types/parse5": {
       "version": "6.0.3",
@@ -4232,6 +4235,12 @@
         "through": "^2.3.8"
       }
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+    "undici-types": {
+      "version": "6.19.8",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.19.8.tgz",
+      "integrity": "sha512-ve2KP6f/JnbPBFyobGHuerC9g1FYGn/F8n1LWTwNxCEzd6IfqTwUQcNXgEtmmQ6DlRrC1hrSrBnCZPokRrDHjw==",
+      "dev": true
+    },
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
diff --git a/lit-element-ts-tsc/package.json b/lit-element-ts-tsc/package.json
index 42e4f7361..9dd036eb1 100644
--- a/lit-element-ts-tsc/package.json
+++ b/lit-element-ts-tsc/package.json
@@ -21,7 +21,7 @@
   },
   "devDependencies": {
     "@open-wc/testing": "2.5.33",
-    "@types/node": "14.18.63",
+    "@types/node": "20.17.2",
     "@web/test-runner": "0.16.0",
     "@web/dev-server": "0.4.6",
     "tslib": "2.6.3",