diff --git a/packages/material-ui/src/Input/Input.d.ts b/packages/material-ui/src/Input/Input.d.ts
index 535d313e2bdada..f0a300a9e7972c 100644
--- a/packages/material-ui/src/Input/Input.d.ts
+++ b/packages/material-ui/src/Input/Input.d.ts
@@ -23,6 +23,7 @@ export interface InputProps
   multiline?: boolean;
   name?: string;
   placeholder?: string;
+  readOnly?: boolean;
   required?: boolean;
   rows?: string | number;
   rowsMax?: string | number;
diff --git a/packages/material-ui/src/Popper/Popper.d.ts b/packages/material-ui/src/Popper/Popper.d.ts
index d4d7642f875551..ec04cbf94d172a 100644
--- a/packages/material-ui/src/Popper/Popper.d.ts
+++ b/packages/material-ui/src/Popper/Popper.d.ts
@@ -20,12 +20,12 @@ export type PopperPlacementType =
 export interface PopperProps extends React.HTMLAttributes<HTMLDivElement> {
   transition?: boolean;
   anchorEl?: null | HTMLElement | ReferenceObject | ((element: HTMLElement) => HTMLElement);
-  children: (
+  children: React.ReactNode | ((
     props: {
       placement: PopperPlacementType;
       TransitionProps?: TransitionProps;
     },
-  ) => React.ReactElement<any>;
+  ) => React.ReactNode);
   container?: PortalProps['container'];
   disablePortal?: PortalProps['disablePortal'];
   keepMounted?: boolean;