diff --git a/Sources/ImGuiSwift/ImGuiBase.swift b/Sources/ImGuiSwift/ImGuiBase.swift
index bd0d65d..c838a7a 100644
--- a/Sources/ImGuiSwift/ImGuiBase.swift
+++ b/Sources/ImGuiSwift/ImGuiBase.swift
@@ -41,7 +41,7 @@ public class ImGuiBase {
     }
     
 	public func setup() {
-		io = imguiWrapper.getIO() as! ImGuiIOBridge
+        io = imguiWrapper.getIO() as? ImGuiIOBridge
 		
 		#if os(iOS)
 		input = InputTextButton()
diff --git a/Sources/ImGuiSwift/ImGuiEnums.swift b/Sources/ImGuiSwift/ImGuiEnums.swift
index bf737ab..4cec446 100644
--- a/Sources/ImGuiSwift/ImGuiEnums.swift
+++ b/Sources/ImGuiSwift/ImGuiEnums.swift
@@ -27,7 +27,7 @@ public struct ImGuiWindowFlags: OptionSet {
 	
 	public let rawValue: Int32
     
-    public init(rawValue: ImGuiWindowFlags.RawValue) {
+    public init(rawValue: Int32) {
         self.rawValue = rawValue
     }
 	
@@ -63,7 +63,7 @@ public struct ImGuiSelectableFlags: OptionSet {
 	
 	public let rawValue: Int32
     
-    public init(rawValue: ImGuiSelectableFlags.RawValue) {
+    public init(rawValue: Int32) {
         self.rawValue = rawValue
     }
 	
@@ -76,7 +76,7 @@ public struct ImGuiInputTextFlags: OptionSet {
 	
 	public let rawValue: Int32
     
-    public init(rawValue: ImGuiInputTextFlags.RawValue) {
+    public init(rawValue: Int32) {
         self.rawValue = rawValue
     }
 	
@@ -106,7 +106,7 @@ public struct ImGuiSetCond: OptionSet
 	
 	public let rawValue: Int32
     
-    public init(rawValue: ImGuiSetCond.RawValue) {
+    public init(rawValue: Int32) {
         self.rawValue = rawValue
     }
 	
diff --git a/Sources/ImGuiSwift/Metal/ImGuiMetal.swift b/Sources/ImGuiSwift/Metal/ImGuiMetal.swift
index 223a343..65180b5 100644
--- a/Sources/ImGuiSwift/Metal/ImGuiMetal.swift
+++ b/Sources/ImGuiSwift/Metal/ImGuiMetal.swift
@@ -97,7 +97,7 @@ public class ImGuiMetal: ImGuiBase {
         if let imguiWrapper = imguiWrapper as? ImGuiWrapperMetal {
             imguiWrapper.newFrame(with: commandEncoder)
         }
-        io = imguiWrapper.getIO() as! ImGuiIOBridge
+        io = imguiWrapper.getIO() as? ImGuiIOBridge
         #if os(iOS)
             DispatchQueue.main.async {
                 self.input.draw(imgui: self)
@@ -109,7 +109,7 @@ public class ImGuiMetal: ImGuiBase {
         if let imguiWrapper = imguiWrapper as? ImGuiWrapperMetal {
             imguiWrapper.newFrame(drawable)
         }
-		io = imguiWrapper.getIO() as! ImGuiIOBridge
+        io = imguiWrapper.getIO() as? ImGuiIOBridge
 		#if os(iOS)
 		input.draw(imgui: self)
 		#endif
diff --git a/Sources/usynergy/uSynergy.h b/Sources/usynergy/uSynergy.h
index cedc387..eb9b396 100644
--- a/Sources/usynergy/uSynergy.h
+++ b/Sources/usynergy/uSynergy.h
@@ -204,7 +204,7 @@ have occured. The time base should be a cyclic millisecond time value.
 
 @returns			Time value in milliseconds
 **/
-typedef uint32_t	(*uSynergyGetTimeFunc)();
+typedef uint32_t	(*uSynergyGetTimeFunc)(void);
 
 
 
diff --git a/Swift-ImGui.xcodeproj/project.pbxproj b/Swift-ImGui.xcodeproj/project.pbxproj
index f22743e..ca5982e 100644
--- a/Swift-ImGui.xcodeproj/project.pbxproj
+++ b/Swift-ImGui.xcodeproj/project.pbxproj
@@ -669,7 +669,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 1000;
-				LastUpgradeCheck = 0940;
+				LastUpgradeCheck = 1020;
 				ORGANIZATIONNAME = "Hiroaki Yamane";
 				TargetAttributes = {
 					994920B0211263B700D206BB = {
@@ -709,7 +709,7 @@
 			};
 			buildConfigurationList = 999ECC271EC6B0F6009C3E39 /* Build configuration list for PBXProject "Swift-ImGui" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
diff --git a/Swift-ImGui.xcodeproj/xcshareddata/xcschemes/Swift-ImGui-iOS.xcscheme b/Swift-ImGui.xcodeproj/xcshareddata/xcschemes/Swift-ImGui-iOS.xcscheme
index df15801..c09c8f5 100644
--- a/Swift-ImGui.xcodeproj/xcshareddata/xcschemes/Swift-ImGui-iOS.xcscheme
+++ b/Swift-ImGui.xcodeproj/xcshareddata/xcschemes/Swift-ImGui-iOS.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0940"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Swift-ImGui.xcodeproj/xcshareddata/xcschemes/Swift-ImGui-macOS.xcscheme b/Swift-ImGui.xcodeproj/xcshareddata/xcschemes/Swift-ImGui-macOS.xcscheme
index 3e66dbd..75040bf 100644
--- a/Swift-ImGui.xcodeproj/xcshareddata/xcschemes/Swift-ImGui-macOS.xcscheme
+++ b/Swift-ImGui.xcodeproj/xcshareddata/xcschemes/Swift-ImGui-macOS.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0940"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"