diff --git a/types/babel-plugin-react-html-attrs/babel-plugin-react-html-attrs-tests.tsx b/types/babel-plugin-react-html-attrs/babel-plugin-react-html-attrs-tests.tsx
index 522b9b43a68e00..a342734bd9f2a4 100644
--- a/types/babel-plugin-react-html-attrs/babel-plugin-react-html-attrs-tests.tsx
+++ b/types/babel-plugin-react-html-attrs/babel-plugin-react-html-attrs-tests.tsx
@@ -36,7 +36,19 @@ const htmlAttributesTest = (
 
         <del datetime="test" />
 
-        <dialog open="" />
+        <dialog />
+        <dialog
+            closedby="closerequest"
+            onCancel={event => {
+                // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
+                event;
+            }}
+            onClose={event => {
+                // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
+                event;
+            }}
+            open
+        />
 
         <fieldset disabled="" />
 
diff --git a/types/babel-plugin-react-html-attrs/index.d.ts b/types/babel-plugin-react-html-attrs/index.d.ts
index b2c3931f9396bb..4987d700fe0ce2 100644
--- a/types/babel-plugin-react-html-attrs/index.d.ts
+++ b/types/babel-plugin-react-html-attrs/index.d.ts
@@ -2052,7 +2052,10 @@ declare namespace React {
     }
 
     interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
-        open?: boolean | string | undefined;
+        closedby?: "any" | "closerequest" | "none" | undefined;
+        onCancel?: ReactEventHandler<T> | undefined;
+        onClose?: ReactEventHandler<T> | undefined;
+        open?: boolean | undefined;
     }
 
     interface EmbedHTMLAttributes<T> extends HTMLAttributes<T> {
diff --git a/types/express-serve-static-core/express-serve-static-core-tests.ts b/types/express-serve-static-core/express-serve-static-core-tests.ts
index 85f3aea6c76ee3..62fd45e116ec61 100644
--- a/types/express-serve-static-core/express-serve-static-core-tests.ts
+++ b/types/express-serve-static-core/express-serve-static-core-tests.ts
@@ -349,3 +349,7 @@ app.get("/async", Promise.resolve);
 
 // Starting with Express 5, app.router is the app's in-built instance of router
 app.router.stack;
+
+app.on("mount", (app) => {
+    app; // $ExpectType Application<Record<string,any>
+});
diff --git a/types/express-serve-static-core/index.d.ts b/types/express-serve-static-core/index.d.ts
index 4664513ef759b0..31bbdf1ff4bc51 100644
--- a/types/express-serve-static-core/index.d.ts
+++ b/types/express-serve-static-core/index.d.ts
@@ -1230,7 +1230,7 @@ export interface Application<
      *  - Not inherit the value of settings that have a default value. You must set the value in the sub-app.
      *  - Inherit the value of settings with no default value.
      */
-    on: (event: string, callback: (parent: Application) => void) => this;
+    on: (event: "mount", callback: (parent: Application) => void) => this;
 
     /**
      * The app.mountpath property contains one or more path patterns on which a sub-app was mounted.
diff --git a/types/express-serve-static-core/package.json b/types/express-serve-static-core/package.json
index 8b246601d2ce78..ec79ed235daa35 100644
--- a/types/express-serve-static-core/package.json
+++ b/types/express-serve-static-core/package.json
@@ -1,7 +1,7 @@
 {
     "private": true,
     "name": "@types/express-serve-static-core",
-    "version": "5.0.9999",
+    "version": "5.1.9999",
     "projects": [
         "http://expressjs.com"
     ],
diff --git a/types/express-serve-static-core/v4/index.d.ts b/types/express-serve-static-core/v4/index.d.ts
index aee3041de0bc2a..9e3d2502624a08 100644
--- a/types/express-serve-static-core/v4/index.d.ts
+++ b/types/express-serve-static-core/v4/index.d.ts
@@ -1281,7 +1281,7 @@ export interface Application<
      *  - Not inherit the value of settings that have a default value. You must set the value in the sub-app.
      *  - Inherit the value of settings with no default value.
      */
-    on: (event: string, callback: (parent: Application) => void) => this;
+    on: (event: "mount", callback: (parent: Application) => void) => this;
 
     /**
      * The app.mountpath property contains one or more path patterns on which a sub-app was mounted.
diff --git a/types/rax/index.d.ts b/types/rax/index.d.ts
index 6fc4967a6c4946..ed1a5604de2f7b 100644
--- a/types/rax/index.d.ts
+++ b/types/rax/index.d.ts
@@ -1683,6 +1683,9 @@ declare namespace Rax {
     }
 
     interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
+        closedby?: "any" | "closerequest" | "none" | undefined;
+        onCancel?: RaxEventHandler<T> | undefined;
+        onClose?: RaxEventHandler<T> | undefined;
         open?: boolean | undefined;
     }
 
diff --git a/types/react/index.d.ts b/types/react/index.d.ts
index 5d82891b4a1bc0..00b03984285762 100644
--- a/types/react/index.d.ts
+++ b/types/react/index.d.ts
@@ -3036,6 +3036,7 @@ declare namespace React {
     }
 
     interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
+        closedby?: "any" | "closerequest" | "none" | undefined;
         onCancel?: ReactEventHandler<T> | undefined;
         onClose?: ReactEventHandler<T> | undefined;
         open?: boolean | undefined;
diff --git a/types/react/test/elementAttributes.tsx b/types/react/test/elementAttributes.tsx
index 469354f3e70287..22e7be732eb7ae 100644
--- a/types/react/test/elementAttributes.tsx
+++ b/types/react/test/elementAttributes.tsx
@@ -87,7 +87,9 @@ const testCases = [
         <source media="test" srcSet="test" width={50} height={50} />
         <img alt="test" src="test" width={100} height={100} fetchPriority="auto" />
     </picture>,
+    <dialog />,
     <dialog
+        closedby="closerequest"
         onCancel={event => {
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
@@ -96,8 +98,8 @@ const testCases = [
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
         }}
-    >
-    </dialog>,
+        open
+    />,
     <link nonce="8IBTHwOdqNKAWeKl7plt8g==" />,
     <center></center>,
     // Float
diff --git a/types/react/ts5.0/index.d.ts b/types/react/ts5.0/index.d.ts
index 3c2305eb280520..f05b815083b901 100644
--- a/types/react/ts5.0/index.d.ts
+++ b/types/react/ts5.0/index.d.ts
@@ -3035,6 +3035,7 @@ declare namespace React {
     }
 
     interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
+        closedby?: "any" | "closerequest" | "none" | undefined;
         onCancel?: ReactEventHandler<T> | undefined;
         onClose?: ReactEventHandler<T> | undefined;
         open?: boolean | undefined;
diff --git a/types/react/ts5.0/test/elementAttributes.tsx b/types/react/ts5.0/test/elementAttributes.tsx
index 469354f3e70287..22e7be732eb7ae 100644
--- a/types/react/ts5.0/test/elementAttributes.tsx
+++ b/types/react/ts5.0/test/elementAttributes.tsx
@@ -87,7 +87,9 @@ const testCases = [
         <source media="test" srcSet="test" width={50} height={50} />
         <img alt="test" src="test" width={100} height={100} fetchPriority="auto" />
     </picture>,
+    <dialog />,
     <dialog
+        closedby="closerequest"
         onCancel={event => {
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
@@ -96,8 +98,8 @@ const testCases = [
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
         }}
-    >
-    </dialog>,
+        open
+    />,
     <link nonce="8IBTHwOdqNKAWeKl7plt8g==" />,
     <center></center>,
     // Float
diff --git a/types/react/v16/index.d.ts b/types/react/v16/index.d.ts
index b6200c03ec623b..ac5eadc34935eb 100644
--- a/types/react/v16/index.d.ts
+++ b/types/react/v16/index.d.ts
@@ -2141,6 +2141,7 @@ declare namespace React {
     }
 
     interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
+        closedby?: "any" | "closerequest" | "none" | undefined;
         onCancel?: ReactEventHandler<T> | undefined;
         onClose?: ReactEventHandler<T> | undefined;
         open?: boolean | undefined;
diff --git a/types/react/v16/test/elementAttributes.tsx b/types/react/v16/test/elementAttributes.tsx
index 198316476d78c3..fa141fb2a6c993 100644
--- a/types/react/v16/test/elementAttributes.tsx
+++ b/types/react/v16/test/elementAttributes.tsx
@@ -54,7 +54,9 @@ const testCases = [
         <source media="test" srcSet="test" width={50} height={50} />
         <img src="test" width={100} height={100} />
     </picture>,
+    <dialog />,
     <dialog
+        closedby="closerequest"
         onCancel={event => {
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
@@ -63,8 +65,8 @@ const testCases = [
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
         }}
-    >
-    </dialog>,
+        open
+    />,
     <link nonce="8IBTHwOdqNKAWeKl7plt8g==" />,
     <>
         <template>
diff --git a/types/react/v17/index.d.ts b/types/react/v17/index.d.ts
index ebb3e0ec94e96a..2673aaf43b3678 100644
--- a/types/react/v17/index.d.ts
+++ b/types/react/v17/index.d.ts
@@ -2166,6 +2166,7 @@ declare namespace React {
     }
 
     interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
+        closedby?: "any" | "closerequest" | "none" | undefined;
         onCancel?: ReactEventHandler<T> | undefined;
         onClose?: ReactEventHandler<T> | undefined;
         open?: boolean | undefined;
diff --git a/types/react/v17/test/elementAttributes.tsx b/types/react/v17/test/elementAttributes.tsx
index 650f49ec5be768..f3b1f3f06ccf51 100644
--- a/types/react/v17/test/elementAttributes.tsx
+++ b/types/react/v17/test/elementAttributes.tsx
@@ -69,7 +69,9 @@ const testCases = [
         <source media="test" srcSet="test" width={50} height={50} />
         <img src="test" width={100} height={100} />
     </picture>,
+    <dialog />,
     <dialog
+        closedby="closerequest"
         onCancel={event => {
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
@@ -78,8 +80,8 @@ const testCases = [
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
         }}
-    >
-    </dialog>,
+        open
+    />,
     <link nonce="8IBTHwOdqNKAWeKl7plt8g==" />,
     <>
         <template>
diff --git a/types/react/v18/index.d.ts b/types/react/v18/index.d.ts
index d2c0f651054705..5756cd7ec65f33 100644
--- a/types/react/v18/index.d.ts
+++ b/types/react/v18/index.d.ts
@@ -3205,6 +3205,7 @@ declare namespace React {
     }
 
     interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
+        closedby?: "any" | "closerequest" | "none" | undefined;
         onCancel?: ReactEventHandler<T> | undefined;
         onClose?: ReactEventHandler<T> | undefined;
         open?: boolean | undefined;
diff --git a/types/react/v18/test/elementAttributes.tsx b/types/react/v18/test/elementAttributes.tsx
index 8a1986527b4581..e410787aaf7bdc 100644
--- a/types/react/v18/test/elementAttributes.tsx
+++ b/types/react/v18/test/elementAttributes.tsx
@@ -94,7 +94,9 @@ const testCases = [
         <source media="test" srcSet="test" width={50} height={50} />
         <img alt="test" src="test" width={100} height={100} fetchPriority="auto" />
     </picture>,
+    <dialog />,
     <dialog
+        closedby="closerequest"
         onCancel={event => {
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
@@ -103,8 +105,8 @@ const testCases = [
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
         }}
-    >
-    </dialog>,
+        open
+    />,
     <link nonce="8IBTHwOdqNKAWeKl7plt8g==" />,
     <center></center>,
     <>
diff --git a/types/react/v18/ts5.0/index.d.ts b/types/react/v18/ts5.0/index.d.ts
index 23b01b94b8dacd..e14b69a5d1fa53 100644
--- a/types/react/v18/ts5.0/index.d.ts
+++ b/types/react/v18/ts5.0/index.d.ts
@@ -3206,6 +3206,7 @@ declare namespace React {
     }
 
     interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
+        closedby?: "any" | "closerequest" | "none" | undefined;
         onCancel?: ReactEventHandler<T> | undefined;
         onClose?: ReactEventHandler<T> | undefined;
         open?: boolean | undefined;
diff --git a/types/react/v18/ts5.0/test/elementAttributes.tsx b/types/react/v18/ts5.0/test/elementAttributes.tsx
index 3e4fa88507be0b..ffff72dff69755 100644
--- a/types/react/v18/ts5.0/test/elementAttributes.tsx
+++ b/types/react/v18/ts5.0/test/elementAttributes.tsx
@@ -87,7 +87,9 @@ const testCases = [
         <source media="test" srcSet="test" width={50} height={50} />
         <img alt="test" src="test" width={100} height={100} fetchPriority="auto" />
     </picture>,
+    <dialog />,
     <dialog
+        closedby="closerequest"
         onCancel={event => {
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
@@ -96,8 +98,8 @@ const testCases = [
             // $ExpectType SyntheticEvent<HTMLDialogElement, Event>
             event;
         }}
-    >
-    </dialog>,
+        open
+    />,
     <link nonce="8IBTHwOdqNKAWeKl7plt8g==" />,
     <center></center>,
     <>
diff --git a/types/webpack-hot-middleware/package.json b/types/webpack-hot-middleware/package.json
index a5ec0259f30d24..b9f41014b065df 100644
--- a/types/webpack-hot-middleware/package.json
+++ b/types/webpack-hot-middleware/package.json
@@ -27,10 +27,6 @@
             "name": "Chris Abrams",
             "githubUsername": "chrisabrams"
         },
-        {
-            "name": "Ilya Zelenko",
-            "githubUsername": "iliyaZelenko"
-        },
         {
             "name": "Rodrigo Saboya",
             "githubUsername": "saboya"