diff --git a/javascript/site-react/package.json.jinja b/javascript/site-react/package.json.jinja
index 96c02a1..3bcd1d8 100644
--- a/javascript/site-react/package.json.jinja
+++ b/javascript/site-react/package.json.jinja
@@ -29,12 +29,12 @@
     "@playwright/test": "^1.62.1",
     "@testing-library/jest-dom": "^7.0.1",
     "@testing-library/react": "16.3.2",
-    "@types/node": "^24.0.0",
+    "@types/node": "^26.4.0",
     "@types/react": "^19.2.18",
     "@types/react-dom": "^19.2.5",
     "@vitejs/plugin-react": "^6.1.1",
     "jsdom": "^30.0.1",
-    "oxfmt": "^0.63.0",
+    "oxfmt": "^0.66.0",
     "oxlint": "^1.81.0",
     "typescript": "^5.9.3",
     "vite": "^8.2.2",
diff --git a/javascript/site-sveltekit/package.json.jinja b/javascript/site-sveltekit/package.json.jinja
index 482704e..a92296a 100644
--- a/javascript/site-sveltekit/package.json.jinja
+++ b/javascript/site-sveltekit/package.json.jinja
@@ -26,8 +26,8 @@
     "@sveltejs/kit": "^2.70.3",
     "@sveltejs/vite-plugin-svelte": "^7.3.0",
     "@tailwindcss/vite": "^4.3.3",
-    "@types/node": "^24.0.0",
-    "oxfmt": "^0.63.0",
+    "@types/node": "^26.4.0",
+    "oxfmt": "^0.66.0",
     "oxlint": "^1.81.0",
     "svelte": "^5.57.0",
     "svelte-check": "^4.7.6",
diff --git a/javascript/site-webawesome/package.json.jinja b/javascript/site-webawesome/package.json.jinja
index 5186059..5244c19 100644
--- a/javascript/site-webawesome/package.json.jinja
+++ b/javascript/site-webawesome/package.json.jinja
@@ -25,8 +25,8 @@
   "devDependencies": {
     "@axe-core/playwright": "^4.13.0",
     "@playwright/test": "^1.62.1",
-    "@types/node": "^24.0.0",
-    "oxfmt": "^0.63.0",
+    "@types/node": "^26.4.0",
+    "oxfmt": "^0.66.0",
     "oxlint": "^1.81.0",
     "typescript": "^5.9.3",
     "vite": "^8.2.2"
diff --git a/javascript/uitk-svelte/package.json.jinja b/javascript/uitk-svelte/package.json.jinja
index 682fcb6..f7e8ec7 100644
--- a/javascript/uitk-svelte/package.json.jinja
+++ b/javascript/uitk-svelte/package.json.jinja
@@ -51,9 +51,9 @@
     "@sveltejs/kit": "^2.70.3",
     "@sveltejs/package": "^2.5.8",
     "@sveltejs/vite-plugin-svelte": "^7.3.0",
-    "@types/node": "^24.0.0",
+    "@types/node": "^26.4.0",
     "jsdom": "^30.0.1",
-    "oxfmt": "^0.63.0",
+    "oxfmt": "^0.66.0",
     "oxlint": "^1.81.0",
     "publint": "^0.3.24",
     "svelte": "^5.57.0",
diff --git a/javascript/uitk-webawesome/package.json.jinja b/javascript/uitk-webawesome/package.json.jinja
index e3c1c2e..6f3776b 100644
--- a/javascript/uitk-webawesome/package.json.jinja
+++ b/javascript/uitk-webawesome/package.json.jinja
@@ -48,9 +48,9 @@
     "@playwright/test": "^1.62.1",
     "@awesome.me/webawesome": "^3.12.0",
     "lit": "^3.3.3",
-    "@types/node": "^24.0.0",
+    "@types/node": "^26.4.0",
     "jsdom": "^30.0.1",
-    "oxfmt": "^0.63.0",
+    "oxfmt": "^0.66.0",
     "oxlint": "^1.81.0",
     "publint": "^0.3.24",
     "typescript": "^5.9.3",
diff --git a/python/cppjswasm/js/package.json.jinja b/python/cppjswasm/js/package.json.jinja
index 4ef8aa0..9693e29 100644
--- a/python/cppjswasm/js/package.json.jinja
+++ b/python/cppjswasm/js/package.json.jinja
@@ -56,7 +56,7 @@
     "http-server": "^14.1.1",
     "nodemon": "^3.1.14",
     "npm-run-all": "^4.1.5",
-    "oxfmt": "^0.63.0",
+    "oxfmt": "^0.66.0",
     "oxlint": "^1.81.0",
     "typescript": "^7.0.2"
   }
diff --git a/python/js/js/package.json.jinja b/python/js/js/package.json.jinja
index 69443b6..75d0cf2 100644
--- a/python/js/js/package.json.jinja
+++ b/python/js/js/package.json.jinja
@@ -49,7 +49,7 @@
     "http-server": "^14.1.1",
     "nodemon": "^3.1.14",
     "npm-run-all": "^4.1.5",
-    "oxfmt": "^0.63.0",
+    "oxfmt": "^0.66.0",
     "oxlint": "^1.81.0",
     "typescript": "^7.0.2"
   }
diff --git a/python/jupyter/js/package.json.jinja b/python/jupyter/js/package.json.jinja
index 537162b..531bb31 100644
--- a/python/jupyter/js/package.json.jinja
+++ b/python/jupyter/js/package.json.jinja
@@ -50,19 +50,19 @@
     "@lumino/disposable": "^2.1.6"
   },
   "devDependencies": {
-    "@babel/cli": "^7.28.6",
-    "@babel/core": "^7.29.0",
-    "@babel/preset-env": "^7.29.3",
+    "@babel/cli": "^8.0.4",
+    "@babel/core": "^8.0.1",
+    "@babel/preset-env": "^8.0.2",
     "@jupyterlab/builder": "^4.5.10",
     "babel-jest": "^30.5.1",
-    "cpy-cli": "^6.0.0",
+    "cpy-cli": "^7.0.0",
     "isomorphic-fetch": "^3.0.0",
     "jest": "^30.5.1",
     "jest-environment-jsdom": "^30.5.1",
     "jest-junit": "^17.0.0",
     "jest-transform-css": "^6.0.3",
     "mkdirp": "^3.0.1",
-    "oxfmt": "^0.63.0",
+    "oxfmt": "^0.66.0",
     "oxlint": "^1.81.0",
     "rimraf": "^6.1.3"
   }
diff --git a/python/rustjswasm/js/package.json.jinja b/python/rustjswasm/js/package.json.jinja
index 1bb207a..30d6431 100644
--- a/python/rustjswasm/js/package.json.jinja
+++ b/python/rustjswasm/js/package.json.jinja
@@ -59,7 +59,7 @@
     "http-server": "^14.1.1",
     "nodemon": "^3.1.14",
     "npm-run-all": "^4.1.5",
-    "oxfmt": "^0.63.0",
+    "oxfmt": "^0.66.0",
     "oxlint": "^1.81.0",
     "typescript": "^7.0.2"
   }