diff --git a/dor-tools-builtin/package.json b/dor-tools-builtin/package.json
index 1c0a62057..69f847817 100644
--- a/dor-tools-builtin/package.json
+++ b/dor-tools-builtin/package.json
@@ -27,7 +27,7 @@
     "dor-tools-lib": "workspace:*",
     "lexical": "0.48.0",
     "mermaid": "11.17.2",
-    "monaco-editor": "0.55.1",
+    "monaco-editor": "0.57.0",
     "react": "^19.3.0",
     "react-dom": "^19.3.0"
   },
diff --git a/dor-tools-builtin/viewer/editor.ts b/dor-tools-builtin/viewer/editor.ts
index bc537fb0e..4e3bfe11e 100644
--- a/dor-tools-builtin/viewer/editor.ts
+++ b/dor-tools-builtin/viewer/editor.ts
@@ -1,21 +1,21 @@
-import * as monaco from 'monaco-editor/esm/vs/editor/editor.api.js';
-import 'monaco-editor/esm/vs/editor/editor.all.js';
-import 'monaco-editor/esm/vs/basic-languages/typescript/typescript.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/javascript/javascript.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/python/python.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/rust/rust.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/go/go.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/java/java.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/cpp/cpp.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/shell/shell.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/powershell/powershell.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/sql/sql.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/yaml/yaml.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/xml/xml.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/css/css.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/markdown/markdown.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/ini/ini.contribution.js';
-import 'monaco-editor/esm/vs/basic-languages/dockerfile/dockerfile.contribution.js';
+import * as monaco from 'monaco-editor/editor';
+import 'monaco-editor/features/register.all';
+import 'monaco-editor/languages/definitions/typescript/register';
+import 'monaco-editor/languages/definitions/javascript/register';
+import 'monaco-editor/languages/definitions/python/register';
+import 'monaco-editor/languages/definitions/rust/register';
+import 'monaco-editor/languages/definitions/go/register';
+import 'monaco-editor/languages/definitions/java/register';
+import 'monaco-editor/languages/definitions/cpp/register';
+import 'monaco-editor/languages/definitions/shell/register';
+import 'monaco-editor/languages/definitions/powershell/register';
+import 'monaco-editor/languages/definitions/sql/register';
+import 'monaco-editor/languages/definitions/yaml/register';
+import 'monaco-editor/languages/definitions/xml/register';
+import 'monaco-editor/languages/definitions/css/register';
+import 'monaco-editor/languages/definitions/markdown/register';
+import 'monaco-editor/languages/definitions/ini/register';
+import 'monaco-editor/languages/definitions/dockerfile/register';
 import { documentSession, stateLabel, textSource } from './document-session';
 import { pageTheme } from './page-theme';
 import { installTooltips } from './tooltip';
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 5c60a6f17..ef8b125fe 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -296,8 +296,8 @@ importers:
         specifier: 11.17.2
         version: 11.17.2
       monaco-editor:
-        specifier: 0.55.1
-        version: 0.55.1
+        specifier: 0.57.0
+        version: 0.57.0
       react:
         specifier: ^19.3.0
         version: 19.3.1
@@ -5570,8 +5570,8 @@ packages:
     resolution: {integrity: sha512-cgwlv/1iFQiFnU96XXgROh8xTeetsnJiDsTc7TYCLFd9+/WNkIqPTxiM/8pSd8VIrhXGTf1Ny1q1hquVqDJB5w==}
     engines: {node: '>= 4'}
 
-  dompurify@3.2.7:
-    resolution: {integrity: sha512-WhL/YuveyGXJaerVlMYGWhvQswa7myDG17P7Vu65EWC05o8vfeNbvNf4d/BOvH99+ZW+LlQsc1GDKMa1vNK6dw==}
+  dompurify@3.4.15:
+    resolution: {integrity: sha512-EUBjM+B+lkDE41iE82DDSCfkoPGfXx8IxFxPMjNzm/Uk4xDet77rTN9wqlxlVg71kK7XGuUMv6wUxJUwwv+Xyw==}
 
   dompurify@3.4.16:
     resolution: {integrity: sha512-sqo+pNp3qRhCIpbgRi1y8Tgk27Bo2Ry7w0dC1NBeNTdZChWjz9Xb/KOoZbRP/R6pQZ80Qw8YhXw13hWWBbMRnQ==}
@@ -6726,8 +6726,8 @@ packages:
     engines: {node: '>=10'}
     hasBin: true
 
-  monaco-editor@0.55.1:
-    resolution: {integrity: sha512-jz4x+TJNFHwHtwuV9vA9rMujcZRb0CEilTEwG2rRSpe/A7Jdkuj8xPKttCgOh+v/lkHy7HsZ64oj+q3xoAFl9A==}
+  monaco-editor@0.57.0:
+    resolution: {integrity: sha512-5BkI9KGoqrNvBGUe15/QlZq3OooZ8WLg1AxTpaqHRCP3HNpzPPZKE2EDz8M7c+VRmCeUw1Brp4cx/PWm3kI/5A==}
 
   mri@1.2.0:
     resolution: {integrity: sha512-tzzskb3bG8LvYGFF/mDTpq3jpI6Q9wc3LEmBaghu+DdCssd1FakN7Bc0hVNmEyGq1bq3RgfkCb3cmQLpNPOroA==}
@@ -12923,7 +12923,7 @@ snapshots:
     dependencies:
       domelementtype: 2.3.0
 
-  dompurify@3.2.7:
+  dompurify@3.4.15:
     optionalDependencies:
       '@types/trusted-types': 2.0.7
 
@@ -14385,9 +14385,9 @@ snapshots:
 
   mkdirp@3.0.1: {}
 
-  monaco-editor@0.55.1:
+  monaco-editor@0.57.0:
     dependencies:
-      dompurify: 3.2.7
+      dompurify: 3.4.15
       marked: 14.0.0
 
   mri@1.2.0: {}
diff --git a/website/src/data/dependencies-npm.json b/website/src/data/dependencies-npm.json
index 896bca2dd..f64dbad1a 100644
--- a/website/src/data/dependencies-npm.json
+++ b/website/src/data/dependencies-npm.json
@@ -2702,7 +2702,7 @@
       "author": "Dr.-Ing. Mario Heiderich, Cure53 <mario@cure53.de> (https://cure53.de/)",
       "homepage": "https://github.com/cure53/DOMPurify",
       "versions": [
-        "3.2.7",
+        "3.4.15",
         "3.4.16"
       ]
     },
@@ -3436,7 +3436,7 @@
       "author": "Microsoft Corporation",
       "homepage": "https://github.com/microsoft/monaco-editor",
       "versions": [
-        "0.55.1"
+        "0.57.0"
       ]
     },
     {