diff --git a/.changelog/5973-fix-react-19-prop-types-typings.md b/.changelog/5973-fix-react-19-prop-types-typings.md
new file mode 100644
index 0000000000..2e3d1f9e4e
--- /dev/null
+++ b/.changelog/5973-fix-react-19-prop-types-typings.md
@@ -0,0 +1,3 @@
+### Removed
+
+- 💥 Function components: removed `ReactWebChat.propTypes` and `Composer.propTypes`, fixing type errors with `@types/react@19`, related to [#5552](https://github.com/microsoft/BotFramework-WebChat/issues/5552), in PR [#5973](https://github.com/microsoft/BotFramework-WebChat/pull/5973), by [@OEvgeny](https://github.com/OEvgeny)
diff --git a/packages/api/src/hooks/Composer.tsx b/packages/api/src/hooks/Composer.tsx
index c3a8ef9927..11678f3d22 100644
--- a/packages/api/src/hooks/Composer.tsx
+++ b/packages/api/src/hooks/Composer.tsx
@@ -857,13 +857,6 @@ const Composer = ({ internalRenderErrorBox, onTelemetry, ponyfill, styleOptions,
   );
 };
 
-Composer.propTypes = {
-  ...ComposerWithStore.propTypes,
-  internalRenderErrorBox: PropTypes.any,
-  onTelemetry: PropTypes.func,
-  ponyfill: PropTypes.any
-};
-
 export default Composer;
 
 export type { ComposerProps };
diff --git a/packages/bundle/src/FullComposer.tsx b/packages/bundle/src/FullComposer.tsx
index 385ebdbaa6..eb74cf6501 100644
--- a/packages/bundle/src/FullComposer.tsx
+++ b/packages/bundle/src/FullComposer.tsx
@@ -1,5 +1,4 @@
 import { Components, type ComposerProps } from 'botframework-webchat-component';
-import PropTypes from 'prop-types';
 import React from 'react';
 import AddFullBundle, { type AddFullBundleProps, type AddFullBundleChildren } from './AddFullBundle';
 
@@ -13,7 +12,7 @@ type ComposerPropsChildren = ComposerProps['children'];
  * The union type of ComposerProps and AddFullBundleProps was not resolving correctly, so manually constructing the type here.
  */
 type FullComposerProps = Omit<BaseFullComposerProps, 'children'> & {
-  children?: ComposerPropsChildren | AddFullBundleChildren;
+  readonly children?: ComposerPropsChildren | AddFullBundleChildren | undefined;
 };
 
 const FullComposer = (props: FullComposerProps) => (
@@ -28,13 +27,6 @@ const FullComposer = (props: FullComposerProps) => (
   </AddFullBundle>
 );
 
-FullComposer.propTypes = {
-  ...Composer.propTypes,
-  adaptiveCardsHostConfig: PropTypes.any,
-  adaptiveCardsPackage: PropTypes.any,
-  children: PropTypes.any
-};
-
 export default FullComposer;
 
 export type { FullComposerProps };
diff --git a/packages/component/src/Composer.tsx b/packages/component/src/Composer.tsx
index 9e82278c4c..789ae10e19 100644
--- a/packages/component/src/Composer.tsx
+++ b/packages/component/src/Composer.tsx
@@ -517,11 +517,5 @@ const Composer = ({
   );
 };
 
-Composer.propTypes = {
-  ...APIComposer.propTypes,
-  ...ComposerCore.propTypes,
-  children: PropTypes.any
-};
-
 export default Composer;
 export type { ComposerProps };
diff --git a/packages/component/src/ReactWebChat.tsx b/packages/component/src/ReactWebChat.tsx
index 93a359e329..b31be76794 100644
--- a/packages/component/src/ReactWebChat.tsx
+++ b/packages/component/src/ReactWebChat.tsx
@@ -1,4 +1,3 @@
-import PropTypes from 'prop-types';
 import React from 'react';
 
 import BasicWebChat from './BasicWebChat';
@@ -25,18 +24,6 @@ const ReactWebChat = ({ className, role, ...composerProps }: ReactWebChatProps)
   </Composer>
 );
 
-const {
-  // Excluding "children" from ComposerProps.
-  children: _,
-  ...composerPropTypesWithoutChildren
-} = Composer.propTypes;
-
-ReactWebChat.propTypes = {
-  className: PropTypes.string,
-  role: PropTypes.string,
-  ...composerPropTypesWithoutChildren
-};
-
 export default ReactWebChat;
 
 export type { ReactWebChatProps };