diff --git a/MulticastDelegatorFramework.xcodeproj/project.pbxproj b/MulticastDelegatorFramework.xcodeproj/project.pbxproj
index 98640df..e1e91aa 100644
--- a/MulticastDelegatorFramework.xcodeproj/project.pbxproj
+++ b/MulticastDelegatorFramework.xcodeproj/project.pbxproj
@@ -154,7 +154,7 @@
 		07AADA35211FC22E003B2B11 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0940;
+				LastUpgradeCheck = 1130;
 				ORGANIZATIONNAME = merrygobyebye;
 				TargetAttributes = {
 					07AADA3D211FC22E003B2B11 = {
@@ -172,6 +172,7 @@
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
+				Base,
 			);
 			mainGroup = 07AADA34211FC22E003B2B11;
 			productRefGroup = 07AADA3F211FC22E003B2B11 /* Products */;
@@ -340,6 +341,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 11.4;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -410,7 +412,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "MulticastDelegatorFrameworkTests/MulticastDelegatorFrameworkTests-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -430,7 +432,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.merrygobyebye.MulticastDelegatorFrameworkTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "MulticastDelegatorFrameworkTests/MulticastDelegatorFrameworkTests-Bridging-Header.h";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
diff --git a/MulticastDelegatorFramework.xcodeproj/xcshareddata/xcschemes/MulticastDelegatorFramework.xcscheme b/MulticastDelegatorFramework.xcodeproj/xcshareddata/xcschemes/MulticastDelegatorFramework.xcscheme
index d8718d6..e7691d1 100644
--- a/MulticastDelegatorFramework.xcodeproj/xcshareddata/xcschemes/MulticastDelegatorFramework.xcscheme
+++ b/MulticastDelegatorFramework.xcodeproj/xcshareddata/xcschemes/MulticastDelegatorFramework.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1010"
+   LastUpgradeVersion = "1130"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -27,6 +27,15 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "07AADA3D211FC22E003B2B11"
+            BuildableName = "MulticastDelegatorFramework.framework"
+            BlueprintName = "MulticastDelegatorFramework"
+            ReferencedContainer = "container:MulticastDelegatorFramework.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
       <Testables>
          <TestableReference
             skipped = "NO">
@@ -39,17 +48,6 @@
             </BuildableReference>
          </TestableReference>
       </Testables>
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "07AADA3D211FC22E003B2B11"
-            BuildableName = "MulticastDelegatorFramework.framework"
-            BlueprintName = "MulticastDelegatorFramework"
-            ReferencedContainer = "container:MulticastDelegatorFramework.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -70,8 +68,6 @@
             ReferencedContainer = "container:MulticastDelegatorFramework.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
diff --git a/MulticastDelegatorFramework/MulticastDelegator.h b/MulticastDelegatorFramework/MulticastDelegator.h
index 0fe9392..cd9e3eb 100644
--- a/MulticastDelegatorFramework/MulticastDelegator.h
+++ b/MulticastDelegatorFramework/MulticastDelegator.h
@@ -8,6 +8,8 @@
 
 @import Foundation;
 
+NS_ASSUME_NONNULL_BEGIN
+
 /*!
  @brief An object that holds a collection (set) of weak references to objects.
  
@@ -52,6 +54,8 @@
  
  @param invocation A block that takes in a non-null ObjectType to pass information from the MulticastDelegator to the ObjectType.
  */
-- (void)invokeDelegates:(void (^ __nonnull)(__nonnull ObjectType))invocation;
+- (void)invokeDelegates:(void (^)(ObjectType))invocation;
 
 @end
+
+NS_ASSUME_NONNULL_END
diff --git a/MulticastDelegatorFramework/MulticastDelegator.m b/MulticastDelegatorFramework/MulticastDelegator.m
index abe4ef4..001c4cf 100644
--- a/MulticastDelegatorFramework/MulticastDelegator.m
+++ b/MulticastDelegatorFramework/MulticastDelegator.m
@@ -50,7 +50,7 @@ - (void)removeDelegate:(id)delegate
     [self._delegates removeObject:delegate];
 }
 
-- (void)invokeDelegates:(void (^ __nonnull)(__nonnull id))invocation
+- (void)invokeDelegates:(void (^)(id))invocation
 {
     for (id delegate in self.delegates)
     {