diff --git a/setup.cfg b/setup.cfg
index 3ea6a3b..2575ebd 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -79,7 +79,7 @@ pyqt6 =
 pyside2 =
     pyside2
 pyside6 =
-    pyside6<6.4.0
+    pyside6
 quantity =
     pint
 testing =
diff --git a/src/superqt/fonticon/_qfont_icon.py b/src/superqt/fonticon/_qfont_icon.py
index 4491660..50575b2 100644
--- a/src/superqt/fonticon/_qfont_icon.py
+++ b/src/superqt/fonticon/_qfont_icon.py
@@ -356,10 +356,9 @@ class QFontIconStore(QObject):
 
     def __init__(self, parent: Optional[QObject] = None) -> None:
         super().__init__(parent=parent)
-        # QT6 drops this
-        dpi = getattr(Qt.ApplicationAttribute, "AA_UseHighDpiPixmaps", None)
-        if dpi:
-            QApplication.setAttribute(dpi)
+        if tuple(QT_VERSION.split(".")) < ("6", "0"):
+            # QT6 drops this
+            QApplication.setAttribute(Qt.ApplicationAttribute.AA_UseHighDpiPixmaps)
 
     @classmethod
     def instance(cls) -> QFontIconStore:
diff --git a/src/superqt/utils/_code_syntax_highlight.py b/src/superqt/utils/_code_syntax_highlight.py
index 47d4fe0..f2640aa 100644
--- a/src/superqt/utils/_code_syntax_highlight.py
+++ b/src/superqt/utils/_code_syntax_highlight.py
@@ -18,7 +18,10 @@ def get_text_char_format(style):
     """
 
     text_char_format = QtGui.QTextCharFormat()
-    text_char_format.setFontFamily("monospace")
+    if hasattr(text_char_format, "setFontFamilies"):
+        text_char_format.setFontFamilies(["monospace"])
+    else:
+        text_char_format.setFontFamily("monospace")
     if style.get("color"):
         text_char_format.setForeground(QtGui.QColor(f"#{style['color']}"))
 
diff --git a/tests/test_sliders/_testutil.py b/tests/test_sliders/_testutil.py
index 7b61497..15994fd 100644
--- a/tests/test_sliders/_testutil.py
+++ b/tests/test_sliders/_testutil.py
@@ -20,10 +20,11 @@ def _mouse_event(pos=QPointF(), type_=QEvent.Type.MouseMove):
     """Create a mouse event of `type_` at `pos`."""
     return QMouseEvent(
         type_,
-        QPointF(pos),
-        Qt.MouseButton.LeftButton,
-        Qt.MouseButton.LeftButton,
-        Qt.KeyboardModifier.NoModifier,
+        QPointF(pos),  # localPos
+        QPointF(),  # windowPos / globalPos
+        Qt.MouseButton.LeftButton,  # button
+        Qt.MouseButton.LeftButton,  # buttons
+        Qt.KeyboardModifier.NoModifier,  # modifiers
     )