diff --git a/Brewlet/AppDelegate.swift b/Brewlet/AppDelegate.swift
index d261cc8..baaf698 100644
--- a/Brewlet/AppDelegate.swift
+++ b/Brewlet/AppDelegate.swift
@@ -139,6 +139,11 @@ class AppDelegate: NSObject, NSApplicationDelegate, PreferencesDelegate {
      */
     @IBAction func update_upgrade(sender: NSMenuItem?) {
         let animation = animateIcon()
+
+        var upgrade_command = "upgrade"
+        if self.userDefaults.bool(forKey: "dontUpgradeCasks") {
+            upgrade_command += " --formula"
+        }
         
         // Determine which packages to include
         let includeDependencies = self.userDefaults.bool(forKey: "includeDependencies")
@@ -148,18 +153,18 @@ class AppDelegate: NSObject, NSApplicationDelegate, PreferencesDelegate {
         
         let shouldUpgrade = self.packages.filter(criterion).count > 0
         
-        let command = shouldUpgrade && sender != nil ? "upgrade" : "update"
+        let command = shouldUpgrade && sender != nil ? upgrade_command : "update"
         let tmpFile = getLogFile()
         
         let updateItem = self.statusMenu.item(withTag: self.name2tag["update"]!)!
         updateItem.isEnabled = false
-        updateItem.title = command == "upgrade" ? "Upgrading..." : "Updating..."
+        updateItem.title = command == "update" ? "Updating..." : "Upgrading..."
         
         let packageItem = self.statusMenu.item(withTag: self.name2tag["packages"]!)!
         packageItem.isEnabled = false
         
         self.run_command(arguments: [command], fileRedirect: tmpFile) { _,_ in
-            os_log("Ran %s command.", type: .info, command)
+            os_log("Ran command: `%s`.", type: .info, command)
             
             updateItem.isEnabled = true
             animation.invalidate()
diff --git a/Brewlet/PreferencesController.swift b/Brewlet/PreferencesController.swift
index 033dee0..2acf933 100644
--- a/Brewlet/PreferencesController.swift
+++ b/Brewlet/PreferencesController.swift
@@ -23,6 +23,7 @@ class PreferencesController: NSWindowController {
     @IBOutlet weak var shareAnalytics: NSButton!
     @IBOutlet weak var autoUpgrade: NSButton!
     @IBOutlet weak var dontNotifyAvailable: NSButton!
+    @IBOutlet weak var dontUpgradeCasks: NSButton!
     @IBOutlet weak var brewPath: NSTextField!
     @IBOutlet weak var intel: NSButton!
     @IBOutlet weak var appleSilicon: NSButton!
@@ -103,6 +104,11 @@ class PreferencesController: NSWindowController {
         UserDefaults.standard.set(sender.state == .on, forKey: "dontNotify")
     }
     
+    @IBAction func dontUpgradeCasksChanged(_ sender: NSButton) {
+        os_log("Update don't upgrade casks: %s", type: .info, sender.state == .on ? "on" : "off")
+        UserDefaults.standard.set(sender.state == .on, forKey: "dontUpgradeCasks")
+    }
+
     @IBAction func updateIntervalChanged(_ sender: NSSlider) {
         
         var seconds: TimeInterval? = nil
diff --git a/Brewlet/PreferencesController.xib b/Brewlet/PreferencesController.xib
index c811c4d..dc14055 100644
--- a/Brewlet/PreferencesController.xib
+++ b/Brewlet/PreferencesController.xib
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="17506" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="21507" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
     <dependencies>
         <deployment identifier="macosx"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="17506"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="21507"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
@@ -13,6 +13,7 @@
                 <outlet property="brewPath" destination="Gid-fS-Jwm" id="Nft-WX-Jk5"/>
                 <outlet property="custom" destination="EJ2-r0-Uu0" id="PS8-ta-DHg"/>
                 <outlet property="dontNotifyAvailable" destination="Ed1-vP-MiE" id="tDI-2a-QWm"/>
+                <outlet property="dontUpgradeCasks" destination="DkG-qz-am4" id="a19-45-c0s"/>
                 <outlet property="includeDependencies" destination="064-ff-SAT" id="EcF-bh-YXb"/>
                 <outlet property="intel" destination="XEL-5K-wHg" id="4U6-jd-Owm"/>
                 <outlet property="shareAnalytics" destination="Fzh-vX-V3a" id="IWq-vV-CyK"/>
@@ -25,14 +26,14 @@
         <window title="Brewlet Preferences" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" animationBehavior="default" id="F0z-JX-Cv5">
             <windowStyleMask key="styleMask" titled="YES" closable="YES"/>
             <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
-            <rect key="contentRect" x="196" y="240" width="496" height="348"/>
+            <rect key="contentRect" x="196" y="240" width="496" height="385"/>
             <rect key="screenRect" x="0.0" y="0.0" width="1440" height="875"/>
             <view key="contentView" id="se5-gp-TjO">
-                <rect key="frame" x="0.0" y="0.0" width="496" height="348"/>
+                <rect key="frame" x="0.0" y="0.0" width="496" height="385"/>
                 <autoresizingMask key="autoresizingMask"/>
                 <subviews>
                     <slider verticalHuggingPriority="750" ambiguous="YES" translatesAutoresizingMaskIntoConstraints="NO" id="WZd-Rc-dmM">
-                        <rect key="frame" x="187" y="300" width="291" height="24"/>
+                        <rect key="frame" x="187" y="337" width="291" height="24"/>
                         <constraints>
                             <constraint firstAttribute="height" constant="24" id="NaI-IH-328"/>
                         </constraints>
@@ -42,7 +43,7 @@
                         </connections>
                     </slider>
                     <textField toolTip="Check for outdated packages, and update metadata at the given time period." horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="NmZ-9C-va2">
-                        <rect key="frame" x="18" y="312" width="156" height="16"/>
+                        <rect key="frame" x="18" y="349" width="156" height="16"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <textFieldCell key="cell" lineBreakMode="clipping" title="Check for updates every:" id="N2S-tz-WUd">
                             <font key="font" metaFont="system"/>
@@ -51,7 +52,7 @@
                         </textFieldCell>
                     </textField>
                     <textField toolTip="Check for outdated packages, and update metadata at the given time period." horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="CLE-bE-Vw3">
-                        <rect key="frame" x="18" y="40" width="4" height="16"/>
+                        <rect key="frame" x="18" y="77" width="4" height="16"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <textFieldCell key="cell" lineBreakMode="clipping" id="Sem-Ur-UK5">
                             <font key="font" metaFont="system"/>
@@ -60,7 +61,7 @@
                         </textFieldCell>
                     </textField>
                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="r7G-Rd-0g0">
-                        <rect key="frame" x="449" y="277" width="40" height="16"/>
+                        <rect key="frame" x="449" y="314" width="40" height="16"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <textFieldCell key="cell" lineBreakMode="clipping" title="Never" id="GOR-Ow-dRi">
                             <font key="font" metaFont="system"/>
@@ -69,7 +70,7 @@
                         </textFieldCell>
                     </textField>
                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="bLq-eF-t2c">
-                        <rect key="frame" x="216" y="277" width="27" height="16"/>
+                        <rect key="frame" x="216" y="314" width="27" height="16"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <textFieldCell key="cell" lineBreakMode="clipping" title="1 hr" id="Lnj-m1-a4v">
                             <font key="font" metaFont="system"/>
@@ -78,7 +79,7 @@
                         </textFieldCell>
                     </textField>
                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Tdj-10-P2m">
-                        <rect key="frame" x="332" y="277" width="35" height="16"/>
+                        <rect key="frame" x="332" y="314" width="35" height="16"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <textFieldCell key="cell" lineBreakMode="clipping" title="3 hrs" id="A5d-kA-hqR">
                             <font key="font" metaFont="system"/>
@@ -87,7 +88,7 @@
                         </textFieldCell>
                     </textField>
                     <button toolTip="Show and notify user about outdated packages that are dependencies of main packages." verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="064-ff-SAT">
-                        <rect key="frame" x="18" y="186" width="198" height="18"/>
+                        <rect key="frame" x="18" y="223" width="198" height="18"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <buttonCell key="cell" type="check" title="Include dependency updates" bezelStyle="regularSquare" imagePosition="left" inset="2" id="JV5-ba-lsL">
                             <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -98,7 +99,7 @@
                         </connections>
                     </button>
                     <button toolTip="Toggle Homebrew's analytics on or off respectively." verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Fzh-vX-V3a">
-                        <rect key="frame" x="18" y="159" width="116" height="18"/>
+                        <rect key="frame" x="18" y="196" width="116" height="18"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <buttonCell key="cell" type="check" title="Share Analytics" bezelStyle="regularSquare" imagePosition="left" inset="2" id="qE3-XI-fiN">
                             <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -109,7 +110,7 @@
                         </connections>
                     </button>
                     <button toolTip="Toggle Homebrew's analytics on or off respectively." horizontalHuggingPriority="750" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="PXg-pr-ea1">
-                        <rect key="frame" x="140" y="156" width="21" height="22"/>
+                        <rect key="frame" x="140" y="193" width="21" height="22"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <buttonCell key="cell" type="help" bezelStyle="helpButton" alignment="center" controlSize="mini" enabled="NO" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="5V8-03-j17">
                             <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
@@ -117,7 +118,7 @@
                         </buttonCell>
                     </button>
                     <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Ed1-vP-MiE">
-                        <rect key="frame" x="18" y="244" width="283" height="18"/>
+                        <rect key="frame" x="18" y="281" width="283" height="18"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <buttonCell key="cell" type="check" title="Don't notify me when updates are available" bezelStyle="regularSquare" imagePosition="left" inset="2" id="uaN-ZH-Roy">
                             <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -128,7 +129,7 @@
                         </connections>
                     </button>
                     <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="vLx-4w-H2K">
-                        <rect key="frame" x="18" y="216" width="334" height="18"/>
+                        <rect key="frame" x="18" y="253" width="334" height="18"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <buttonCell key="cell" type="check" title="Auto upgrade packages when updates are available" bezelStyle="regularSquare" imagePosition="left" inset="2" id="YPE-Pa-Ear">
                             <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -139,7 +140,7 @@
                         </connections>
                     </button>
                     <button toolTip="Show and notify user about outdated packages that are dependencies of main packages." horizontalHuggingPriority="750" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Gf3-wD-l3z">
-                        <rect key="frame" x="220" y="183" width="21" height="22"/>
+                        <rect key="frame" x="220" y="220" width="21" height="22"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <buttonCell key="cell" type="help" bezelStyle="helpButton" alignment="center" controlSize="mini" enabled="NO" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="Mk7-vH-PLL">
                             <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
@@ -147,14 +148,14 @@
                         </buttonCell>
                     </button>
                     <box fixedFrame="YES" title="Homebrew Location" translatesAutoresizingMaskIntoConstraints="NO" id="v9z-Ab-ahE">
-                        <rect key="frame" x="8" y="16" width="482" height="133"/>
+                        <rect key="frame" x="7" y="16" width="482" height="133"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <view key="contentView" id="TsI-QL-inX">
-                            <rect key="frame" x="3" y="3" width="476" height="115"/>
+                            <rect key="frame" x="4" y="5" width="474" height="113"/>
                             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                             <subviews>
                                 <button verticalHuggingPriority="750" id="XEL-5K-wHg">
-                                    <rect key="frame" x="10" y="66" width="456" height="18"/>
+                                    <rect key="frame" x="10" y="64" width="456" height="18"/>
                                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                                     <buttonCell key="cell" type="radio" title="Intel - /usr/local/bin/brew" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="09D-OH-rj7">
                                         <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -165,7 +166,7 @@
                                     </connections>
                                 </button>
                                 <button verticalHuggingPriority="750" id="EJ2-r0-Uu0">
-                                    <rect key="frame" x="10" y="44" width="456" height="18"/>
+                                    <rect key="frame" x="10" y="42" width="456" height="18"/>
                                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                                     <buttonCell key="cell" type="radio" title="Custom" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="Lzb-PK-Mug">
                                         <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -176,7 +177,7 @@
                                     </connections>
                                 </button>
                                 <button verticalHuggingPriority="750" id="9HT-Mt-VPU">
-                                    <rect key="frame" x="10" y="88" width="456" height="18"/>
+                                    <rect key="frame" x="10" y="86" width="456" height="18"/>
                                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                                     <buttonCell key="cell" type="radio" title="Apple Silicon - /opt/homebrew/bin/brew" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="Qb7-9f-0qS">
                                         <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -187,7 +188,7 @@
                                     </connections>
                                 </button>
                                 <textField verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Gid-fS-Jwm">
-                                    <rect key="frame" x="12" y="16" width="454" height="21"/>
+                                    <rect key="frame" x="12" y="14" width="454" height="21"/>
                                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                                     <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" selectable="YES" editable="YES" sendsActionOnEndEditing="YES" borderStyle="bezel" placeholderString="/usr/local/bin/brew" drawsBackground="YES" id="zvI-R2-MhG">
                                         <font key="font" usesAppearanceFont="YES"/>
@@ -201,12 +202,31 @@
                             </subviews>
                         </view>
                     </box>
+                    <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="DkG-qz-am4">
+                        <rect key="frame" x="18" y="168" width="151" height="18"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                        <buttonCell key="cell" type="check" title="Don't upgrade casks" bezelStyle="regularSquare" imagePosition="left" inset="2" id="pip-g4-6Bf">
+                            <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                            <font key="font" metaFont="system"/>
+                        </buttonCell>
+                        <connections>
+                            <action selector="dontUpgradeCasksChanged:" target="-2" id="cWJ-e9-jbx"/>
+                        </connections>
+                    </button>
+                    <button toolTip="Use when casks require privileged access to upgrade. " horizontalHuggingPriority="750" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="olc-bt-ftM">
+                        <rect key="frame" x="169" y="166" width="21" height="22"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                        <buttonCell key="cell" type="help" bezelStyle="helpButton" alignment="center" controlSize="mini" enabled="NO" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="RIy-9v-cf2">
+                            <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                            <font key="font" metaFont="label" size="9"/>
+                        </buttonCell>
+                    </button>
                 </subviews>
             </view>
             <connections>
                 <outlet property="delegate" destination="-2" id="0bl-1N-AYu"/>
             </connections>
-            <point key="canvasLocation" x="-4193" y="-34"/>
+            <point key="canvasLocation" x="-4193" y="-55.5"/>
         </window>
     </objects>
 </document>