diff --git a/auto-codex-ui/package.json b/auto-codex-ui/package.json
index 11af8dd..e57f0eb 100644
--- a/auto-codex-ui/package.json
+++ b/auto-codex-ui/package.json
@@ -66,7 +66,7 @@
     "react": "^19.2.3",
     "react-dom": "^19.2.3",
     "react-markdown": "^10.1.0",
-    "react-resizable-panels": "^3.0.6",
+    "react-resizable-panels": "^4.0.16",
     "remark-gfm": "^4.0.1",
     "tailwind-merge": "^3.4.0",
     "uuid": "^13.0.0",
diff --git a/auto-codex-ui/pnpm-lock.yaml b/auto-codex-ui/pnpm-lock.yaml
index 2c6f63c..ca8cf48 100644
--- a/auto-codex-ui/pnpm-lock.yaml
+++ b/auto-codex-ui/pnpm-lock.yaml
@@ -122,8 +122,8 @@ importers:
         specifier: ^10.1.0
         version: 10.1.0(@types/react@19.2.7)(react@19.2.3)
       react-resizable-panels:
-        specifier: ^3.0.6
-        version: 3.0.6(react-dom@19.2.3(react@19.2.3))(react@19.2.3)
+        specifier: ^4.0.16
+        version: 4.0.16(react-dom@19.2.3(react@19.2.3))(react@19.2.3)
       remark-gfm:
         specifier: ^4.0.1
         version: 4.0.1
@@ -3910,11 +3910,11 @@ packages:
       '@types/react':
         optional: true
 
-  react-resizable-panels@3.0.6:
-    resolution: {integrity: sha512-b3qKHQ3MLqOgSS+FRYKapNkJZf5EQzuf6+RLiq1/IlTHw99YrZ2NJZLk4hQIzTnnIkRg2LUqyVinu6YWWpUYew==}
+  react-resizable-panels@4.0.16:
+    resolution: {integrity: sha512-xhU02yogk3lD1f353oNAGm419pov2imCtxegHJN6FclXtGrfLglkl/h4K/RBHBxsGtR79lp12Zmz3Bbi/BoHpA==}
     peerDependencies:
-      react: ^16.14.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc
-      react-dom: ^16.14.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc
+      react: ^18.0.0 || ^19.0.0
+      react-dom: ^18.0.0 || ^19.0.0
 
   react-style-singleton@2.2.3:
     resolution: {integrity: sha512-b6jSvxvVnyptAiLjbkWLE/lOnR4lfTtDAl+eUC7RZy+QQWc6wRzIV2CE6xBuMmDxc2qIihtDCZD5NPOFl7fRBQ==}
@@ -4569,6 +4569,7 @@ packages:
   whatwg-encoding@3.1.1:
     resolution: {integrity: sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==}
     engines: {node: '>=18'}
+    deprecated: Use @exodus/bytes instead for a more spec-conformant and faster implementation
 
   whatwg-mimetype@4.0.0:
     resolution: {integrity: sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==}
@@ -8887,7 +8888,7 @@ snapshots:
     optionalDependencies:
       '@types/react': 19.2.7
 
-  react-resizable-panels@3.0.6(react-dom@19.2.3(react@19.2.3))(react@19.2.3):
+  react-resizable-panels@4.0.16(react-dom@19.2.3(react@19.2.3))(react@19.2.3):
     dependencies:
       react: 19.2.3
       react-dom: 19.2.3(react@19.2.3)