diff --git a/Example/KVKCalendar.xcodeproj/project.pbxproj b/Example/KVKCalendar.xcodeproj/project.pbxproj
index 3e3ed310..70f291c0 100644
--- a/Example/KVKCalendar.xcodeproj/project.pbxproj
+++ b/Example/KVKCalendar.xcodeproj/project.pbxproj
@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 46;
+	objectVersion = 56;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -302,7 +302,7 @@
 				};
 			};
 			buildConfigurationList = 607FACCB1AFB9204008FA782 /* Build configuration list for PBXProject "KVKCalendar" */;
-			compatibilityVersion = "Xcode 3.2";
+			compatibilityVersion = "Xcode 14.0";
 			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
@@ -656,7 +656,8 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
-				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
@@ -673,7 +674,10 @@
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.developer-tools";
 				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
 				"IPHONEOS_DEPLOYMENT_TARGET[sdk=macosx*]" = 14.2;
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "KVKCalendar-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -697,7 +701,10 @@
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.developer-tools";
 				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
 				"IPHONEOS_DEPLOYMENT_TARGET[sdk=macosx*]" = 14.2;
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "KVKCalendar-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -723,7 +730,11 @@
 					"$(inherited)",
 				);
 				INFOPLIST_FILE = Tests/Info.plist;
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@loader_path/Frameworks",
+				);
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
@@ -741,7 +752,11 @@
 					"$(inherited)",
 				);
 				INFOPLIST_FILE = Tests/Info.plist;
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@loader_path/Frameworks",
+				);
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
@@ -760,7 +775,10 @@
 				INFOPLIST_FILE = "$(SRCROOT)/KVKCalendar_Example_SwiftUI-Info.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
 				"IPHONEOS_DEPLOYMENT_TARGET[sdk=macosx*]" = 14.2;
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "KVKCalendar-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -784,7 +802,10 @@
 				INFOPLIST_FILE = "$(SRCROOT)/KVKCalendar_Example_SwiftUI-Info.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
 				"IPHONEOS_DEPLOYMENT_TARGET[sdk=macosx*]" = 14.2;
-				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "KVKCalendar-Example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
diff --git a/Example/Podfile b/Example/Podfile
index 3571ebde..cfc23b5f 100644
--- a/Example/Podfile
+++ b/Example/Podfile
@@ -1,5 +1,5 @@
 use_frameworks!
-platform :ios, '10.0'
+platform :ios, '13.0'
 
 target 'KVKCalendar_Example' do
   pod 'KVKCalendar', :path => '../'
diff --git a/KVKCalendar.podspec b/KVKCalendar.podspec
index 04fa1a22..0e6f6796 100644
--- a/KVKCalendar.podspec
+++ b/KVKCalendar.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'KVKCalendar'
-  s.version          = '0.6.19'
+  s.version          = '0.6.20'
   s.summary          = 'A most fully customization calendar for Apple platforms.'
   
   s.description      = <<-DESC
diff --git a/Sources/KVKCalendar/MonthView.swift b/Sources/KVKCalendar/MonthView.swift
index 0808750d..07315109 100644
--- a/Sources/KVKCalendar/MonthView.swift
+++ b/Sources/KVKCalendar/MonthView.swift
@@ -112,7 +112,9 @@ final class MonthView: UIView {
         guard superview?.superview != nil && collectionView?.dataSource != nil else { return }
         
         DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) { [weak self] in
-            guard let self = self, let collectionView = collectionView, collectionView.numberOfSections >= idx else { return }
+            guard let self = self,
+                  let collectionView = self.collectionView,
+                  collectionView.numberOfSections >= idx else { return }
             
             if let attributes = self.collectionView?.layoutAttributesForSupplementaryElement(ofKind: UICollectionView.elementKindSectionHeader, at: IndexPath(row: 0, section: idx)),
                let inset = self.collectionView?.contentInset {