diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7f15f2d..a4f77b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,8 +13,8 @@ set (RELEASE_SERVICE_VERSION "${RELEASE_SERVICE_VERSION_MAJOR}.${RELEASE_SERVICE
 project(partitionmanager VERSION ${RELEASE_SERVICE_VERSION})
 
 # Dependencies
-set(QT_MIN_VERSION "5.14.0")
-set(KF5_MIN_VERSION "5.73")
+set(QT_MIN_VERSION "5.15.0")
+set(KF5_MIN_VERSION "5.90")
 set(KPMCORE_MIN_VERSION "${RELEASE_SERVICE_VERSION_MAJOR}.${RELEASE_SERVICE_VERSION_MINOR}")
 
 set(CMAKE_USE_RELATIVE_PATHS OFF)
@@ -69,7 +69,7 @@ add_definitions(
   -DQT_NO_CAST_FROM_BYTEARRAY
   -DQT_NO_CAST_TO_BYTEARRAY
   -DQT_USE_FAST_OPERATOR_PLUS
-  -DQT_DISABLE_DEPRECATED_BEFORE=0x050900
+  -DQT_DISABLE_DEPRECATED_BEFORE=0x050f00
   -DQT_NO_KEYWORDS
 )
 
diff --git a/src/gui/sizedialogbase.cpp b/src/gui/sizedialogbase.cpp
index 25a75e5..6e503f6 100644
--- a/src/gui/sizedialogbase.cpp
+++ b/src/gui/sizedialogbase.cpp
@@ -162,6 +162,7 @@ void SizeDialogBase::setupConnections()
     connect(&dialogWidget().partResizerWidget(), &PartResizerWidget::firstSectorChanged, this, &SizeDialogBase::onResizerWidgetFirstSectorChanged);
     connect(&dialogWidget().partResizerWidget(), &PartResizerWidget::lastSectorChanged, this, &SizeDialogBase::onResizerWidgetLastSectorChanged);
 
+    // TODO: Qt6 remove qOverload
     connect(&dialogWidget().spinFreeBefore(), qOverload<double>(&QDoubleSpinBox::valueChanged), this, &SizeDialogBase::onSpinFreeBeforeChanged);
     connect(&dialogWidget().spinFreeAfter(), qOverload<double>(&QDoubleSpinBox::valueChanged), this, &SizeDialogBase::onSpinFreeAfterChanged);
     connect(&dialogWidget().spinCapacity(), qOverload<double>(&QDoubleSpinBox::valueChanged), this, &SizeDialogBase::onSpinCapacityChanged);
@@ -305,7 +306,7 @@ void SizeDialogBase::onSpinFreeAfterChanged(double newAfter)
         updateSpinFreeAfter(dialogUnitToSectors(device(), oldAfter));
 }
 
-void SizeDialogBase::onSpinFirstSectorChanged(qint64 newFirst)
+void SizeDialogBase::onSpinFirstSectorChanged(double newFirst)
 {
     if (newFirst >= minimumFirstSector() && dialogWidget().partResizerWidget().updateFirstSector(newFirst))
         setDirty();
@@ -315,7 +316,7 @@ void SizeDialogBase::onSpinFirstSectorChanged(qint64 newFirst)
         updateSpinFirstSector(partition().firstSector());
 }
 
-void SizeDialogBase::onSpinLastSectorChanged(qint64 newLast)
+void SizeDialogBase::onSpinLastSectorChanged(double newLast)
 {
     if (newLast <= maximumLastSector() && dialogWidget().partResizerWidget().updateLastSector(newLast))
         setDirty();
diff --git a/src/gui/sizedialogbase.h b/src/gui/sizedialogbase.h
index 2d49e08..69116f1 100644
--- a/src/gui/sizedialogbase.h
+++ b/src/gui/sizedialogbase.h
@@ -117,8 +117,8 @@ protected:
     void onSpinFreeBeforeChanged(double newBefore);
     void onSpinFreeAfterChanged(double newAfter);
 
-    void onSpinFirstSectorChanged(qint64 newFirst);
-    void onSpinLastSectorChanged(qint64 newLast);
+    void onSpinFirstSectorChanged(double newFirst);
+    void onSpinLastSectorChanged(double newLast);
     void onAlignToggled(bool);
 
     void onLVNameChanged(const QString& newName);