diff --git a/SwiftyAcknowledgements.xcodeproj/project.pbxproj b/SwiftyAcknowledgements.xcodeproj/project.pbxproj
index 445d422..26c78eb 100644
--- a/SwiftyAcknowledgements.xcodeproj/project.pbxproj
+++ b/SwiftyAcknowledgements.xcodeproj/project.pbxproj
@@ -494,6 +494,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 				Base,
 			);
@@ -747,7 +748,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "de.mathiasnagler.SwiftyAcknowledgementsTests-iOS";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -759,7 +760,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "de.mathiasnagler.SwiftyAcknowledgementsTests-iOS";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -771,7 +772,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "de.mathiasnagler.SwiftyAcknowledgements-tvOS-Tests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Debug;
@@ -784,7 +785,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "de.mathiasnagler.SwiftyAcknowledgements-tvOS-Tests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Release;
@@ -804,7 +805,7 @@
 				PRODUCT_NAME = SwiftyAcknowledgements;
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -825,7 +826,7 @@
 				PRODUCT_NAME = SwiftyAcknowledgements;
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -842,7 +843,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "de.mathiasnagler.tvOS-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -859,7 +860,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "de.mathiasnagler.tvOS-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -975,7 +976,7 @@
 				PRODUCT_NAME = SwiftyAcknowledgements;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -995,7 +996,7 @@
 				PRODUCT_NAME = SwiftyAcknowledgements;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -1008,7 +1009,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "de.mathiasnagler.iOS-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -1022,7 +1023,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "de.mathiasnagler.iOS-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
diff --git a/SwiftyAcknowledgements.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/SwiftyAcknowledgements.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/SwiftyAcknowledgements.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/SwiftyAcknowledgements/AcknowledgementsTableViewController.swift b/SwiftyAcknowledgements/AcknowledgementsTableViewController.swift
index f3e7992..5799764 100644
--- a/SwiftyAcknowledgements/AcknowledgementsTableViewController.swift
+++ b/SwiftyAcknowledgements/AcknowledgementsTableViewController.swift
@@ -178,7 +178,7 @@ public class AcknowledgementsTableViewController: UITableViewController {
     
     private func updateHeaderFooterViews(forWidth width: CGFloat) {
         let headerWidthConstraint = NSLayoutConstraint(item: headerView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: width)
-        headerWidthConstraint.priority = 999
+        headerWidthConstraint.priority = UILayoutPriority(999)
         headerWidthConstraint.isActive = true
         let headerHeight = headerView.systemLayoutSizeFitting(UILayoutFittingCompressedSize).height
         headerWidthConstraint.isActive = false
@@ -186,7 +186,7 @@ public class AcknowledgementsTableViewController: UITableViewController {
         tableView.tableHeaderView = headerView
         
         let footerWidthConstraint = NSLayoutConstraint(item: footerView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: width)
-        footerWidthConstraint.priority = 999
+        footerWidthConstraint.priority = UILayoutPriority(999)
         footerWidthConstraint.isActive = true
         let footerHeight = footerView.systemLayoutSizeFitting(UILayoutFittingCompressedSize).height
         footerWidthConstraint.isActive = false