diff --git a/CHANGELOG.md b/CHANGELOG.md
index a4d9ba95a0e..45f40029eb3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,5 @@
 ## [`main`](https://github.com/elastic/eui/tree/main)
-
-No public interface changes since `51.0.0`.
+- Updated `testenv` mock for `EuiFlyout` to include default `aria-label` on the close button ([#5702](https://github.com/elastic/eui/pull/5702))
 
 ## [`51.0.0`](https://github.com/elastic/eui/tree/v51.0.0)
 
diff --git a/src/components/flyout/flyout.testenv.tsx b/src/components/flyout/flyout.testenv.tsx
index 24e92b21e6f..3e430159969 100644
--- a/src/components/flyout/flyout.testenv.tsx
+++ b/src/components/flyout/flyout.testenv.tsx
@@ -29,6 +29,7 @@ export const EuiFlyout = ({
         <button
           type="button"
           data-test-subj="euiFlyoutCloseButton"
+          aria-label="Close this dialog"
           onClick={(e: React.MouseEvent<HTMLButtonElement>) => {
             onClose();
             closeButtonProps?.onClick && closeButtonProps.onClick(e);