diff --git a/.travis.yml b/.travis.yml
index fa220ad..09db92b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: objective-c
 
 os: osx
-osx_image: xcode10.2
+osx_image: xcode11.4
 
 sudo: false # Enable container-based builds
 
diff --git a/SwiftGit2.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/SwiftGit2.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/SwiftGit2.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/SwiftGit2/Diffs.swift b/SwiftGit2/Diffs.swift
index a1d64b7..337d87f 100644
--- a/SwiftGit2/Diffs.swift
+++ b/SwiftGit2/Diffs.swift
@@ -94,7 +94,7 @@ public struct Diff {
 		}
 		public let rawValue: UInt32
 
-		public static let binary     = Flags(rawValue: 0)
+		public static let binary     = Flags([])
 		public static let notBinary  = Flags(rawValue: 1 << 0)
 		public static let validId    = Flags(rawValue: 1 << 1)
 		public static let exists     = Flags(rawValue: 1 << 2)
diff --git a/SwiftGit2/Repository.swift b/SwiftGit2/Repository.swift
index eda25f1..61d4047 100644
--- a/SwiftGit2/Repository.swift
+++ b/SwiftGit2/Repository.swift
@@ -588,9 +588,10 @@ public final class Repository {
 
 	/// Stage the file(s) under the specified path.
 	public func add(path: String) -> Result<(), NSError> {
-		let dir = path
-		var dirPointer = UnsafeMutablePointer<Int8>(mutating: (dir as NSString).utf8String)
-		var paths = git_strarray(strings: &dirPointer, count: 1)
+		var dirPointer = UnsafeMutablePointer<Int8>(mutating: (path as NSString).utf8String)
+		var paths = withExtendedLifetime(&dirPointer) {
+			git_strarray(strings: $0, count: 1)
+		}
 		return unsafeIndex().flatMap { index in
 			defer { git_index_free(index) }
 			let addResult = git_index_add_all(index, &paths, 0, nil, nil)
diff --git a/script/cibuild b/script/cibuild
index b6c25c9..278d989 100755
--- a/script/cibuild
+++ b/script/cibuild
@@ -69,8 +69,8 @@ elif [ "$SCHEME" == "SwiftGit2-iOS" ]; then
   #   "The requested device could not be found because no available devices matched the request."
   #   "The requested device could not be found because multiple devices matched the request."
   SIMULATOR_NAME="Custom Simulator"
-  DEVICE_ID=com.apple.CoreSimulator.SimDeviceType.iPhone-5
-  RUNTIME_ID=com.apple.CoreSimulator.SimRuntime.iOS-10-2
+  DEVICE_ID=com.apple.CoreSimulator.SimDeviceType.iPhone-X
+  RUNTIME_ID=com.apple.CoreSimulator.SimRuntime.iOS-11-4
   DESTINATION_ID=$(xcrun simctl create "$SIMULATOR_NAME" $DEVICE_ID $RUNTIME_ID)
 
   echo "*** Building and testing $SCHEME..."