diff --git a/gui/KCC.ui b/gui/KCC.ui
index b2b1c35..7af91e3 100644
--- a/gui/KCC.ui
+++ b/gui/KCC.ui
@@ -344,7 +344,7 @@
           <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p style='white-space:pre'&gt;Resolution of the target device.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
          <property name="maximum">
-          <number>2400</number>
+          <number>3200</number>
          </property>
         </widget>
        </item>
@@ -370,7 +370,7 @@
           <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p style='white-space:pre'&gt;Resolution of the target device.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
          <property name="maximum">
-          <number>3840</number>
+          <number>5120</number>
          </property>
         </widget>
        </item>
diff --git a/kindlecomicconverter/KCC_ui.py b/kindlecomicconverter/KCC_ui.py
index 1eb8c92..cb26aae 100644
--- a/kindlecomicconverter/KCC_ui.py
+++ b/kindlecomicconverter/KCC_ui.py
@@ -190,7 +190,7 @@ class Ui_mainWindow(object):
 
         self.widthBox = QSpinBox(self.customWidget)
         self.widthBox.setObjectName(u"widthBox")
-        self.widthBox.setMaximum(2400)
+        self.widthBox.setMaximum(3200)
 
         self.gridLayout_3.addWidget(self.widthBox, 0, 1, 1, 1)
 
@@ -203,7 +203,7 @@ class Ui_mainWindow(object):
 
         self.heightBox = QSpinBox(self.customWidget)
         self.heightBox.setObjectName(u"heightBox")
-        self.heightBox.setMaximum(3840)
+        self.heightBox.setMaximum(5120)
 
         self.gridLayout_3.addWidget(self.heightBox, 0, 3, 1, 1)