diff --git a/.github/workflows/build-npm.yml b/.github/workflows/build-npm.yml
index 80e91f6d..14b5a2c5 100644
--- a/.github/workflows/build-npm.yml
+++ b/.github/workflows/build-npm.yml
@@ -72,7 +72,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
         with:
-          node-version: "24.22.1"
+          node-version: "26.12.0"
 
       - name: Install dependencies
         run: npm ci
@@ -160,7 +160,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
         with:
-          node-version: "24.22.1"
+          node-version: "26.12.0"
 
       - name: Install dependencies
         run: npm ci
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 623831f5..5c0c88bc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -131,7 +131,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
         with:
-          node-version: "24.22.1"
+          node-version: "26.12.0"
 
       - name: Install frontend dependencies
         run: npm ci
@@ -197,7 +197,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
         with:
-          node-version: "24.22.1"
+          node-version: "26.12.0"
 
       - name: Install frontend dependencies
         run: npm ci
@@ -251,7 +251,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
         with:
-          node-version: "24.22.1"
+          node-version: "26.12.0"
 
       - name: Install frontend dependencies
         run: npm ci
diff --git a/.github/workflows/publish-npm.yml b/.github/workflows/publish-npm.yml
index 4541268a..23f97843 100644
--- a/.github/workflows/publish-npm.yml
+++ b/.github/workflows/publish-npm.yml
@@ -17,7 +17,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
         with:
-          node-version: "24.22.1"
+          node-version: "26.12.0"
           registry-url: "https://registry.npmjs.org"
 
       - name: Install dependencies
@@ -71,7 +71,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
         with:
-          node-version: "24.22.1"
+          node-version: "26.12.0"
           registry-url: "https://registry.npmjs.org"
 
       - name: Download viewer build
diff --git a/package-lock.json b/package-lock.json
index 275d6414..a87b9ec7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4381,13 +4381,13 @@
       "license": "MIT"
     },
     "node_modules/@types/node": {
-      "version": "25.9.9",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.9.9.tgz",
-      "integrity": "sha512-b4e2xxj/yMeT2hNlD6x7zNFiQK2Dlmkb9CQ6v3/1G2RezKN4YS2lcEv8lzGm1mhs4f2lM4yNAMI/zUDBZBBt7w==",
+      "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": ">=7.24.0 <7.24.7"
+        "undici-types": "~8.9.0"
       }
     },
     "node_modules/@typescript-eslint/eslint-plugin": {
@@ -9203,9 +9203,9 @@
       }
     },
     "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"
     },
@@ -10158,7 +10158,7 @@
         "@tailwindcss/vite": "^4.3.3",
         "@testing-library/svelte": "^5.4.2",
         "@tsconfig/svelte": "^5.0.8",
-        "@types/node": "^25.9.9",
+        "@types/node": "^26.6.5",
         "@vitest/coverage-v8": "^5.0.4",
         "@vitest/eslint-plugin": "^1.6.27",
         "eslint": "^10.12.0",
diff --git a/packages/viewer/package.json b/packages/viewer/package.json
index 2cb26495..26179b52 100644
--- a/packages/viewer/package.json
+++ b/packages/viewer/package.json
@@ -31,7 +31,7 @@
     "@tailwindcss/vite": "^4.3.3",
     "@testing-library/svelte": "^5.4.2",
     "@tsconfig/svelte": "^5.0.8",
-    "@types/node": "^25.9.9",
+    "@types/node": "^26.6.5",
     "@vitest/coverage-v8": "^5.0.4",
     "@vitest/eslint-plugin": "^1.6.27",
     "eslint": "^10.12.0",