diff --git a/package-lock.json b/package-lock.json
index ea8c601..372ccbe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,7 @@
         "@matdata/yasgui": "^6.6.0",
         "@types/jest": "^30.0.0",
         "@types/n3": "^1.26.4",
-        "@types/node": "^20.19.43",
+        "@types/node": "^26.6.5",
         "cssnano": "^7.1.9",
         "esbuild": "^0.28.2",
         "jest": "^30.5.2",
@@ -2789,13 +2789,13 @@
       }
     },
     "node_modules/@types/node": {
-      "version": "20.19.43",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.19.43.tgz",
-      "integrity": "sha512-6oYBAi5ikg4Pl+kGsoYtawUMBT2zZMCvPNF7pVLnHZfd1zf38DRiWn/gT01RYCdUqkv7Fhr+C9ot4/tb+2sVvA==",
+      "version": "26.6.5",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.6.5.tgz",
+      "integrity": "sha512-uMzsv9stDdofIZBx4UGh4Z9ZgXnGC9seRDscilBcTHAeOFk67MZg/k9bWVfO+bk4qZmG+l52hRnLwUiH2LnJTg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "undici-types": "~6.21.0"
+        "undici-types": "~8.9.0"
       }
     },
     "node_modules/@types/stack-utils": {
@@ -7638,9 +7638,9 @@
       }
     },
     "node_modules/undici-types": {
-      "version": "6.21.0",
-      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
-      "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
+      "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"
     },
diff --git a/package.json b/package.json
index 68157cb..d8e3ba9 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
     "@matdata/yasgui": "^6.6.0",
     "@types/jest": "^30.0.0",
     "@types/n3": "^1.26.4",
-    "@types/node": "^20.19.43",
+    "@types/node": "^26.6.5",
     "cssnano": "^7.1.9",
     "esbuild": "^0.28.2",
     "jest": "^30.5.2",