diff --git a/debian/changelog b/debian/changelog
index bfe615e..bef66d5 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -2,6 +2,7 @@ qt6-base (6.6.2+dfsg-8) UNRELEASED; urgency=medium
 
   [ Patrick Franz ]
   * Remove the temporary Provides for the t64-suffix.
+  * Handle upstream ABI break (Closes: #1071193, #1071436).
 
  -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Sat, 01 Jun 2024 02:12:55 +0200
 
diff --git a/debian/control b/debian/control
index 3777a70..82df0fa 100644
--- a/debian/control
+++ b/debian/control
@@ -105,7 +105,7 @@ Multi-Arch: same
 Pre-Depends: ${misc:Pre-Depends},
 Depends: shared-mime-info, ${misc:Depends}, ${shlibs:Depends},
 Recommends: qt6-translations-l10n,
-Breaks: libqt6core6 (<< ${source:Version}),
+Breaks: libqt6core6 (<< ${source:Version}), libqt6core5compat6 (<< 6.6.0~)
 Replaces: libqt6core6,
 Description: Qt 6 core module
  Qt is a cross-platform C++ application framework. Qt's primary feature