diff --git a/pyproject.toml b/pyproject.toml
index 0e13256..25b529b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ dependencies = [
     "labscript_utils>=3.1.0b1",
     "labscript-c-extensions",
     "pyqtgraph>=0.11.1",
-    "qtutils>=2.0.0",
+    "qtutils>=4.0.0",
     "zprocess",
     "numpy>=1.15",
     "scipy",
diff --git a/runviewer/__main__.py b/runviewer/__main__.py
index bbccb2a..8aa1bb2 100644
--- a/runviewer/__main__.py
+++ b/runviewer/__main__.py
@@ -1671,7 +1671,7 @@ def handler(self, h5_filepath):
     splash.hide()
 
     def execute_program():
-        qapplication.exec_()
+        qapplication.exec()
 
     # Let the interpreter run every 500ms so it sees Ctrl-C interrupts:
     timer = QTimer()
diff --git a/runviewer/main.ui b/runviewer/main.ui
index c2db1d2..60d7f0a 100644
--- a/runviewer/main.ui
+++ b/runviewer/main.ui
@@ -29,28 +29,28 @@
 
 QPushButton:hover {
      background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
-                                       stop: 0 #f6f7fa, stop: 1 #dadbde);
-     border: 1px solid #8f8f91;
+                                       stop: 0 palette(light), stop: 1 palette(window));
+     border: 1px solid palette(dark);
      border-radius: 3px;
  }
 
  QPushButton:pressed {
      background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
-                                       stop: 0 #dadbde, stop: 1 #f6f7fa);
-     border: 1px solid #8f8f91;
+                                       stop: 0 palette(window), stop: 1 palette(light));
+     border: 1px solid palette(dark);
      border-radius: 3px;
  }
 
 QPushButton:checked {
-     background-color: #dadbde;
-     border: 1px solid #8f8f91;
+     background-color: palette(window);
+     border: 1px solid palette(dark);
      border-radius: 3px;
  }
 
 QPushButton:hover:checked {
      background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
-                                       stop: 0 #dadbde, stop: 1 #f6f7fa);
-     border: 1px solid #8f8f91;
+                                       stop: 0 palette(window), stop: 1 palette(light));
+     border: 1px solid palette(dark);
      border-radius: 3px;
  }
 
@@ -61,28 +61,28 @@ QToolButton {
 
 QToolButton:hover {
      background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
-                                       stop: 0 #f6f7fa, stop: 1 #dadbde);
-     border: 1px solid #8f8f91;
+                                       stop: 0 palette(light), stop: 1 palette(window));
+     border: 1px solid palette(dark);
      border-radius: 3px;
  }
 
  QToolButton:pressed {
      background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
-                                       stop: 0 #dadbde, stop: 1 #f6f7fa);
-     border: 1px solid #8f8f91;
+                                       stop: 0 palette(window), stop: 1 palette(light));
+     border: 1px solid palette(dark);
      border-radius: 3px;
  }
 
 QToolButton:checked {
-     background-color: #dadbde;
-     border: 1px solid #8f8f91;
+     background-color: palette(window);
+     border: 1px solid palette(dark);
      border-radius: 3px;
  }
 
 QToolButton:hover:checked {
      background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
-                                       stop: 0 #dadbde, stop: 1 #f6f7fa);
-     border: 1px solid #8f8f91;
+                                       stop: 0 palette(window), stop: 1 palette(light));
+     border: 1px solid palette(dark);
      border-radius: 3px;
  }</string>
    </property>