diff --git a/packages/components/CHANGELOG.md b/packages/components/CHANGELOG.md
index 0c1b07f774a9e..65ed149e34c21 100644
--- a/packages/components/CHANGELOG.md
+++ b/packages/components/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Enhancements
+
+-   `ConfirmDialog`: Add `__next40pxDefaultSize` to buttons ([#58421](https://github.com/WordPress/gutenberg/pull/58421)).
+
 ### Bug Fix
 
 -   `DateTime`: Add a timezone offset value for display purposes. ([#56682](https://github.com/WordPress/gutenberg/pull/56682)).
diff --git a/packages/components/src/confirm-dialog/component.tsx b/packages/components/src/confirm-dialog/component.tsx
index 750e7030de13c..6fc03ffa73373 100644
--- a/packages/components/src/confirm-dialog/component.tsx
+++ b/packages/components/src/confirm-dialog/component.tsx
@@ -96,6 +96,7 @@ const UnconnectedConfirmDialog = (
 						<Text>{ children }</Text>
 						<Flex direction="row" justify="flex-end">
 							<Button
+								__next40pxDefaultSize
 								ref={ cancelButtonRef }
 								variant="tertiary"
 								onClick={ handleEvent( onCancel ) }
@@ -103,6 +104,7 @@ const UnconnectedConfirmDialog = (
 								{ cancelLabel }
 							</Button>
 							<Button
+								__next40pxDefaultSize
 								ref={ confirmButtonRef }
 								variant="primary"
 								onClick={ handleEvent( onConfirm ) }