diff --git a/src/xdot/xdot_qt.py b/src/xdot/xdot_qt.py
index 2abaf79..cd88c50 100755
--- a/src/xdot/xdot_qt.py
+++ b/src/xdot/xdot_qt.py
@@ -33,13 +33,15 @@
 
 #from PySide.QtCore import *
 #from PySide.QtGui import *
-from PyQt4 import *
-from PyQt4.QtCore import *
-from PyQt4.QtGui import *
+from PyQt5 import *
+from PyQt5.QtCore import *
+from PyQt5.QtGui import *
 
+from PyQt5.QtCore import Signal
+from python_qt_binding.QtWidgets import QWidget, QMainWindow
 #from python_qt_binding import  *
-#from python_qt_binding.QtCore import  *
-#from python_qt_binding.QtGui import  *
+#from python_qt_binding.QtCore import QMainWindow
+#from python_qt_binding.QtGui import *
 
 #--------------------------------------------------------------------------------------------------------------------------------------------------------------------
 #-- Drawing Classes --#
@@ -1338,6 +1340,8 @@ class DotWidget(QWidget):
     """Qt widget that draws dot graphs."""
 
     filter = 'dot'
+    trigger = pyqtSignal(str,str,QMouseEvent)
+
 
     def __init__(self,  parent=None):
         super(DotWidget,  self).__init__(parent)
@@ -1634,9 +1638,9 @@ def mouseReleaseEvent(self, event):
             x, y = event.x(), event.y()
             url = self.get_url(x, y)
             if url is not None:
-                self.emit(SIGNAL("clicked"), unicode(url.url), event)
+                self.trigger.emit("clicked", unicode(url.url), event)
             else:
-                self.emit(SIGNAL("clicked"), 'none', event)
+                self.trigger.emit("clicked", 'none', event)
                 jump = self.get_jump(x, y)
                 if jump is not None:
                     self.animate_to(jump.x, jump.y)
@@ -1647,9 +1651,9 @@ def mouseReleaseEvent(self, event):
             x, y = event.x(), event.y()
             url = self.get_url(x, y)
             if url is not None:
-                self.emit(SIGNAL("right_clicked"), unicode(url.url), event)
+                self.trigger.emit("right_clicked", unicode(url.url), event)
             else:
-                self.emit(SIGNAL("right_clicked"), 'none', event)
+                self.trigger.emit("right_clicked", 'none', event)
                 jump = self.get_jump(x, y)
                 if jump is not None:
                     self.animate_to(jump.x, jump.y)
@@ -1662,10 +1666,10 @@ def on_area_scroll_event(self, area, event):
         return False
 
     def wheelEvent(self, event):
-        if event.delta() > 0:
+        if event.angleDelta().y() > 0:
             self.zoom_image(self.zoom_ratio * self.ZOOM_INCREMENT,
                             pos=(event.x(), event.y()))
-        if event.delta() < 0:
+        if event.angleDelta().y() < 0:
             self.zoom_image(self.zoom_ratio / self.ZOOM_INCREMENT,
                             pos=(event.x(), event.y()))