diff --git a/kstars/ekos/align/align.cpp b/kstars/ekos/align/align.cpp
--- a/kstars/ekos/align/align.cpp
+++ b/kstars/ekos/align/align.cpp
@@ -1039,7 +1039,7 @@
     boxNames.sort(Qt::CaseInsensitive);
     boxNames.removeDuplicates();
     greekBoxNames.removeDuplicates();
-    qSort(greekBoxNames.begin(), greekBoxNames.end(), [](const QString & a, const QString & b)
+    std::sort(greekBoxNames.begin(), greekBoxNames.end(), [](const QString & a, const QString & b)
     {
         QStringList aParts = a.split(' ');
         QStringList bParts = b.split(' ');
diff --git a/kstars/ekos/guide/internalguide/internalguider.cpp b/kstars/ekos/guide/internalguide/internalguider.cpp
--- a/kstars/ekos/guide/internalguide/internalguider.cpp
+++ b/kstars/ekos/guide/internalguide/internalguider.cpp
@@ -1190,9 +1190,9 @@
             useNativeDetection = true;
             // For SEP, prefer flux total
             if (Options::guideAlgorithm() == SEP_THRESHOLD)
-                qSort(starCenters.begin(), starCenters.end(), [](const Edge *a, const Edge *b) { return a->val > b->val; });
+                std::sort(starCenters.begin(), starCenters.end(), [](const Edge *a, const Edge *b) { return a->val > b->val; });
             else
-                qSort(starCenters.begin(), starCenters.end(), [](const Edge *a, const Edge *b) { return a->width > b->width; });
+                std::sort(starCenters.begin(), starCenters.end(), [](const Edge *a, const Edge *b) { return a->width > b->width; });
 
             guideFrame->setStarsEnabled(true);
             guideFrame->updateFrame();
diff --git a/kstars/ekos/scheduler/scheduler.cpp b/kstars/ekos/scheduler/scheduler.cpp
--- a/kstars/ekos/scheduler/scheduler.cpp
+++ b/kstars/ekos/scheduler/scheduler.cpp
@@ -1123,7 +1123,11 @@
         return;
 
     /* Swap jobs in the list */
+    #if QT_VERSION >= QT_VERSION_CHECK(5,13,0)
+    jobs.swapItemsAt(currentRow, destinationRow);
+    #else
     jobs.swap(currentRow, destinationRow);
+    #endif
 
     /* Reassign status cells */
     setJobStatusCells(currentRow);
@@ -1158,7 +1162,11 @@
         return;
 
     /* Swap jobs in the list */
+    #if QT_VERSION >= QT_VERSION_CHECK(5,13,0)
+    jobs.swapItemsAt(currentRow, destinationRow);
+    #else
     jobs.swap(currentRow, destinationRow);
+    #endif
 
     /* Reassign status cells */
     setJobStatusCells(currentRow);
diff --git a/kstars/hips/hipsmanager.cpp b/kstars/hips/hipsmanager.cpp
--- a/kstars/hips/hipsmanager.cpp
+++ b/kstars/hips/hipsmanager.cpp
@@ -387,7 +387,12 @@
   Q_ASSERT(item);
   Q_ASSERT(item->image);
 
+  #if QT_VERSION >= QT_VERSION_CHECK(5,10,0)
+  int cost = item->image->sizeInBytes();
+  #else
   int cost = item->image->byteCount();
+  #endif
+
   m_cache.add(key, item, cost);
 }
 
diff --git a/kstars/hips/hipsrenderer.cpp b/kstars/hips/hipsrenderer.cpp
--- a/kstars/hips/hipsrenderer.cpp
+++ b/kstars/hips/hipsrenderer.cpp
@@ -164,7 +164,12 @@
     if (image)      
     {
       m_rendered++;
+
+      #if QT_VERSION >= QT_VERSION_CHECK(5,10,0)
+      m_size += image->sizeInBytes();
+      #else
       m_size += image->byteCount();
+      #endif
 
       // UV Mapping to apply image unto the destination image
       // 4x4 = 16 points are mapped from the source image unto the destination image.
diff --git a/kstars/skyqpainter.cpp b/kstars/skyqpainter.cpp
--- a/kstars/skyqpainter.cpp
+++ b/kstars/skyqpainter.cpp
@@ -910,7 +910,13 @@
                 save();
                 QFont f             = font();
                 const QString qMark = " ? ";
+
+                #if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
+                double scaleFactor  = 0.8 * size / fontMetrics().horizontalAdvance(qMark);
+                #else
                 double scaleFactor  = 0.8 * size / fontMetrics().width(qMark);
+                #endif
+
                 f.setPointSizeF(f.pointSizeF() * scaleFactor);
                 setFont(f);
                 translate(x, y);
diff --git a/kstars/tools/scriptbuilder.cpp b/kstars/tools/scriptbuilder.cpp
--- a/kstars/tools/scriptbuilder.cpp
+++ b/kstars/tools/scriptbuilder.cpp
@@ -89,7 +89,12 @@
             {
                 child->setExpanded(true);
 
+                #if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
+                int w = qfm.horizontalAdvance(child->text(icol)) + 4;
+                #else
                 int w = qfm.width(child->text(icol)) + 4;
+                #endif
+
                 if (icol == 0)
                 {
                     w += 2 * optionsList()->indentation();
diff --git a/kstars/widgets/infoboxwidget.cpp b/kstars/widgets/infoboxwidget.cpp
--- a/kstars/widgets/infoboxwidget.cpp
+++ b/kstars/widgets/infoboxwidget.cpp
@@ -61,8 +61,14 @@
 {
     QFontMetrics fm(font());
     int w = 0;
-    foreach (const QString &str, m_strings)
+    foreach (const QString &str, m_strings) {
+        #if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
+        w = qMax(w, fm.horizontalAdvance(str));
+        #else
         w = qMax(w, fm.width(str));
+        #endif
+    }
+
     int h = fm.height() * (m_shaded ? 1 : m_strings.size());
     // Add padding
     resize(w + 2 * padX, h + 2 * padY + 2);
diff --git a/kstars/widgets/timespinbox.cpp b/kstars/widgets/timespinbox.cpp
--- a/kstars/widgets/timespinbox.cpp
+++ b/kstars/widgets/timespinbox.cpp
@@ -56,7 +56,12 @@
     uint wmax = 0;
     for (int i = 0; i < maximum(); ++i)
     {
+        #if QT_VERSION >= QT_VERSION_CHECK(5,11,0)
+        uint w = fm.horizontalAdvance('-' + TimeString[i]);
+        #else
         uint w = fm.width('-' + TimeString[i]);
+        #endif
+
         if (w > wmax)
             wmax = w;
     }