diff --git a/NodeGraphQt/vendor/Qt.py b/NodeGraphQt/vendor/Qt.py
old mode 100644
new mode 100755
index b47ef631..b1d51c4f
--- a/NodeGraphQt/vendor/Qt.py
+++ b/NodeGraphQt/vendor/Qt.py
@@ -44,7 +44,7 @@
 import importlib
 
 
-__version__ = "1.2.0.b3"
+__version__ = "1.2.0"
 
 # Enable support for `from Qt import *`
 __all__ = []
@@ -778,6 +778,32 @@ def _wrapinstance(ptr, base=None):
     return func(long(ptr), base)
 
 
+def _isvalid(object):
+    """Check if the object is valid to use in Python runtime.
+
+    Usage:
+        See :func:`QtCompat.isValid()`
+
+    Arguments:
+        object (QObject): QObject to check the validity of.
+
+    """
+
+    assert isinstance(object, Qt.QtCore.QObject)
+
+    if hasattr(Qt, "_shiboken2"):
+        return getattr(Qt, "_shiboken2").isValid(object)
+
+    elif hasattr(Qt, "_shiboken"):
+        return getattr(Qt, "_shiboken").isValid(object)
+
+    elif hasattr(Qt, "_sip"):
+        return not getattr(Qt, "_sip").isdeleted(object)
+
+    else:
+        raise AttributeError("'module' has no attribute isValid")
+
+
 def _translate(context, sourceText, *args):
     # In Qt4 bindings, translate can be passed 2 or 3 arguments
     # In Qt5 bindings, translate can be passed 2 arguments
@@ -968,6 +994,7 @@ def createWidget(self, class_name, parent=None, name=""):
         "QtUiTools.QUiLoader": ["QtCompat.loadUi", _loadUi],
         "shiboken2.wrapInstance": ["QtCompat.wrapInstance", _wrapinstance],
         "shiboken2.getCppPointer": ["QtCompat.getCppPointer", _getcpppointer],
+        "shiboken2.isValid": ["QtCompat.isValid", _isvalid],
         "QtWidgets.qApp": "QtWidgets.QApplication.instance()",
         "QtCore.QCoreApplication.translate": [
             "QtCompat.translate", _translate
@@ -992,6 +1019,7 @@ def createWidget(self, class_name, parent=None, name=""):
         "uic.loadUi": ["QtCompat.loadUi", _loadUi],
         "sip.wrapinstance": ["QtCompat.wrapInstance", _wrapinstance],
         "sip.unwrapinstance": ["QtCompat.getCppPointer", _getcpppointer],
+        "sip.isdeleted": ["QtCompat.isValid", _isvalid],
         "QtWidgets.qApp": "QtWidgets.QApplication.instance()",
         "QtCore.QCoreApplication.translate": [
             "QtCompat.translate", _translate
@@ -1024,6 +1052,7 @@ def createWidget(self, class_name, parent=None, name=""):
         "QtUiTools.QUiLoader": ["QtCompat.loadUi", _loadUi],
         "shiboken.wrapInstance": ["QtCompat.wrapInstance", _wrapinstance],
         "shiboken.unwrapInstance": ["QtCompat.getCppPointer", _getcpppointer],
+        "shiboken.isValid": ["QtCompat.isValid", _isvalid],
         "QtGui.qApp": "QtWidgets.QApplication.instance()",
         "QtCore.QCoreApplication.translate": [
             "QtCompat.translate", _translate
@@ -1057,6 +1086,7 @@ def createWidget(self, class_name, parent=None, name=""):
         "uic.loadUi": ["QtCompat.loadUi", _loadUi],
         "sip.wrapinstance": ["QtCompat.wrapInstance", _wrapinstance],
         "sip.unwrapinstance": ["QtCompat.getCppPointer", _getcpppointer],
+        "sip.isdeleted": ["QtCompat.isValid", _isvalid],
         "QtCore.QString": "str",
         "QtGui.qApp": "QtWidgets.QApplication.instance()",
         "QtCore.QCoreApplication.translate": [
@@ -1391,6 +1421,10 @@ def _pyside2():
 
     if hasattr(Qt, "_QtCore"):
         Qt.__qt_version__ = Qt._QtCore.qVersion()
+        Qt.QtCompat.dataChanged = (
+            lambda self, topleft, bottomright, roles=None:
+            self.dataChanged.emit(topleft, bottomright, roles or [])
+        )
 
     if hasattr(Qt, "_QtWidgets"):
         Qt.QtCompat.setSectionResizeMode = \
@@ -1438,6 +1472,10 @@ def _pyside():
 
     if hasattr(Qt, "_QtCore"):
         Qt.__qt_version__ = Qt._QtCore.qVersion()
+        Qt.QtCompat.dataChanged = (
+            lambda self, topleft, bottomright, roles=None:
+            self.dataChanged.emit(topleft, bottomright)
+        )
 
     _reassign_misplaced_members("PySide")
     _build_compatibility_members("PySide")
@@ -1448,11 +1486,18 @@ def _pyqt5():
 
     import PyQt5 as module
     extras = ["uic"]
+
     try:
         import sip
-        extras.append(sip.__name__)
+        extras += ["sip"]
     except ImportError:
-        sip = None
+
+        # Relevant to PyQt5 5.11 and above
+        try:
+            from PyQt5 import sip
+            extras += ["sip"]
+        except ImportError:
+            sip = None
 
     _setup(module, extras)
     if hasattr(Qt, "_sip"):
@@ -1466,6 +1511,10 @@ def _pyqt5():
     if hasattr(Qt, "_QtCore"):
         Qt.__binding_version__ = Qt._QtCore.PYQT_VERSION_STR
         Qt.__qt_version__ = Qt._QtCore.QT_VERSION_STR
+        Qt.QtCompat.dataChanged = (
+            lambda self, topleft, bottomright, roles=None:
+            self.dataChanged.emit(topleft, bottomright, roles or [])
+        )
 
     if hasattr(Qt, "_QtWidgets"):
         Qt.QtCompat.setSectionResizeMode = \
@@ -1542,6 +1591,10 @@ def _pyqt4():
     if hasattr(Qt, "_QtCore"):
         Qt.__binding_version__ = Qt._QtCore.PYQT_VERSION_STR
         Qt.__qt_version__ = Qt._QtCore.QT_VERSION_STR
+        Qt.QtCompat.dataChanged = (
+            lambda self, topleft, bottomright, roles=None:
+            self.dataChanged.emit(topleft, bottomright)
+        )
 
     _reassign_misplaced_members("PyQt4")
 
@@ -1867,4 +1920,4 @@ def _install():
 # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.