diff --git a/package-lock.json b/package-lock.json
index fbfafac..906b169 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,14 +10,14 @@
       "license": "MIT",
       "devDependencies": {
         "@arethetypeswrong/cli": "^0.18.2",
-        "@types/node": "^24.0.0",
+        "@types/node": "^26.6.4",
         "prettier": "^3.6.0",
         "publint": "^0.3.12",
         "typescript": "^5.9.0",
         "vitest": "^4.0.16"
       },
       "engines": {
-        "node": ">=18"
+        "node": ">=20"
       }
     },
     "node_modules/@andrewbranch/untar.js": {
@@ -452,14 +452,13 @@
       "license": "MIT"
     },
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-      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.19.2.tgz",
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+      "version": "26.6.4",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.6.4.tgz",
+      "integrity": "sha512-ldVPDCzj7fsaGZrLB0NuHuTvJcsNasysBAqMolr/cgxrLd1xbqxIr3XJiPnHHJUCxj5sNF1vnRj9aWnrVh5Jcg==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
-        "undici-types": ">=7.24.0 <7.24.7"
+        "undici-types": "~8.9.0"
       }
     },
     "node_modules/@vitest/expect": {
@@ -1209,7 +1208,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "marked": "bin/marked.js"
       },
@@ -1381,7 +1379,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -1720,9 +1717,9 @@
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     },
     "node_modules/undici-types": {
-      "version": "7.24.6",
-      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.24.6.tgz",
-      "integrity": "sha512-WRNW+sJgj5OBN4/0JpHFqtqzhpbnV0GuB+OozA9gCL7a993SmU+1JBZCzLNxYsbMfIeDL+lTsphD5jN5N+n0zg==",
+      "version": "8.9.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.9.0.tgz",
+      "integrity": "sha512-KTDyRTYX8sWmKXAikPHHSyc63CRPETMctyjKFupcC6OBLXT3xsN0e9aF7m+mIXutFWpUXuedtowG7iLOzp0kQg==",
       "dev": true,
       "license": "MIT"
     },
@@ -1752,7 +1749,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "lightningcss": "^1.33.0",
         "picomatch": "^4.0.7",
diff --git a/package.json b/package.json
index 8ef44a1..85ea6cc 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
   },
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.18.2",
-    "@types/node": "^24.0.0",
+    "@types/node": "^26.6.4",
     "prettier": "^3.6.0",
     "publint": "^0.3.12",
     "typescript": "^5.9.0",