diff --git a/package.json b/package.json
index d0ae45bbf86..6b4e3633835 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
     "esbuild": "0.28.1",
     "idiomorph": "0.7.4",
     "jquery": "4.0.0",
-    "js-yaml": "4.2.0",
+    "js-yaml": "5.1.0",
     "katex": "0.17.0",
     "mermaid": "11.15.0",
     "online-3d-viewer": "0.18.0",
@@ -81,7 +81,6 @@
     "@stylistic/stylelint-plugin": "5.2.0",
     "@types/codemirror": "5.60.17",
     "@types/jquery": "4.0.1",
-    "@types/js-yaml": "4.0.9",
     "@types/katex": "0.16.8",
     "@types/node": "25.9.4",
     "@types/pdfobject": "2.2.5",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 0e9fef4893c..c8ba4a70570 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -141,8 +141,8 @@ importers:
         specifier: 4.0.0
         version: 4.0.0
       js-yaml:
-        specifier: 4.2.0
-        version: 4.2.0
+        specifier: 5.1.0
+        version: 5.1.0
       katex:
         specifier: 0.17.0
         version: 0.17.0
@@ -228,9 +228,6 @@ importers:
       '@types/jquery':
         specifier: 4.0.1
         version: 4.0.1
-      '@types/js-yaml':
-        specifier: 4.0.9
-        version: 4.0.9
       '@types/katex':
         specifier: 0.16.8
         version: 0.16.8
@@ -1313,9 +1310,6 @@ packages:
   '@types/jquery@4.0.1':
     resolution: {integrity: sha512-9a59A/tycXgYuPABcp6/3spSShn0NT2UOM4EfHvMumjYi4lJWTsK5SZWjhx3yRm9IHGCeWXdV2YfNsrWrft/CA==}
 
-  '@types/js-yaml@4.0.9':
-    resolution: {integrity: sha512-k4MGaQl5TGo/iipqb2UDG2UwjXziSWkh0uysQelTlJpX1qGlpUZYm8PnO4DxG1qBomtJUdYJ6qR6xdIah10JLg==}
-
   '@types/jsdom@20.0.1':
     resolution: {integrity: sha512-d0r18sZPmMQr1eG35u12FZfhIXNrnsPU/g5wvRKCUf/tOGilKKwYMYGqh33BNR6ba+2gkHw1EUiHoN3mn7E5IQ==}
 
@@ -3068,6 +3062,10 @@ packages:
     resolution: {integrity: sha512-ePWsvanv0DWuDRsW8dnt+R4jQ31SCRCQ7hhNcPXZPsoBZiemuZNYGf7adZdqX2D86j6rvKp3RpCxVTSb8WQlOw==}
     hasBin: true
 
+  js-yaml@5.1.0:
+    resolution: {integrity: sha512-s8VA5jkR8f22S3NAXmhKPFqGUduqZGlsufabVOgN14iTdw/RXcym7bKkbwjxLK9Yw2lEvvmJjFp119+KPeo8Kg==}
+    hasBin: true
+
   jsdoc-type-pratt-parser@7.2.0:
     resolution: {integrity: sha512-dh140MMgjyg3JhJZY/+iEzW+NO5xR2gpbDFKHqotCmexElVntw7GjWjt511+C/Ef02RU5TKYrJo/Xlzk+OLaTw==}
     engines: {node: '>=20.0.0'}
@@ -5541,8 +5539,6 @@ snapshots:
 
   '@types/jquery@4.0.1': {}
 
-  '@types/js-yaml@4.0.9': {}
-
   '@types/jsdom@20.0.1':
     dependencies:
       '@types/node': 25.9.4
@@ -7538,6 +7534,10 @@ snapshots:
     dependencies:
       argparse: 2.0.1
 
+  js-yaml@5.1.0:
+    dependencies:
+      argparse: 2.0.1
+
   jsdoc-type-pratt-parser@7.2.0: {}
 
   jsdom@20.0.3: