diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bdc12f20..c8f237b1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,7 +17,7 @@ jobs:
   test:
     needs: build
     env:
-      os: '14.0'
+      os: '14.4'
     strategy:
       matrix:
         device: [iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone 8, iPhone 8 Plus, iPhone SE (2nd generation)]
diff --git a/Examples/ClassData/ClassData.xcodeproj/project.pbxproj b/Examples/ClassData/ClassData.xcodeproj/project.pbxproj
index 4df44cb7..3d81cd35 100644
--- a/Examples/ClassData/ClassData.xcodeproj/project.pbxproj
+++ b/Examples/ClassData/ClassData.xcodeproj/project.pbxproj
@@ -141,7 +141,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0820;
-				LastUpgradeCheck = 1200;
+				LastUpgradeCheck = 1300;
 				ORGANIZATIONNAME = "Kishikawa Katsumi";
 				TargetAttributes = {
 					149DC9391ECDB05200297E38 = {
@@ -266,7 +266,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -320,7 +320,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
diff --git a/Examples/ClassData/ClassData.xcodeproj/xcshareddata/xcschemes/ClassData.xcscheme b/Examples/ClassData/ClassData.xcodeproj/xcshareddata/xcschemes/ClassData.xcscheme
index bf678a6e..dcbdd342 100644
--- a/Examples/ClassData/ClassData.xcodeproj/xcshareddata/xcschemes/ClassData.xcscheme
+++ b/Examples/ClassData/ClassData.xcodeproj/xcshareddata/xcschemes/ClassData.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1200"
+   LastUpgradeVersion = "1300"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Examples/GanttChart/GanttChart.xcodeproj/project.pbxproj b/Examples/GanttChart/GanttChart.xcodeproj/project.pbxproj
index 99448d15..68f503b2 100644
--- a/Examples/GanttChart/GanttChart.xcodeproj/project.pbxproj
+++ b/Examples/GanttChart/GanttChart.xcodeproj/project.pbxproj
@@ -138,7 +138,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0820;
-				LastUpgradeCheck = 1200;
+				LastUpgradeCheck = 1300;
 				ORGANIZATIONNAME = "Kishikawa Katsumi";
 				TargetAttributes = {
 					1497BDF81EBFC054003186A3 = {
@@ -264,7 +264,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -318,7 +318,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
diff --git a/Examples/GanttChart/GanttChart.xcodeproj/xcshareddata/xcschemes/GanttChart.xcscheme b/Examples/GanttChart/GanttChart.xcodeproj/xcshareddata/xcschemes/GanttChart.xcscheme
index 506b61cb..8bdc0f25 100644
--- a/Examples/GanttChart/GanttChart.xcodeproj/xcshareddata/xcschemes/GanttChart.xcscheme
+++ b/Examples/GanttChart/GanttChart.xcodeproj/xcshareddata/xcschemes/GanttChart.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1200"
+   LastUpgradeVersion = "1300"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Examples/Schedule/Schedule.xcodeproj/project.pbxproj b/Examples/Schedule/Schedule.xcodeproj/project.pbxproj
index 26eee1c1..9e46aa9f 100644
--- a/Examples/Schedule/Schedule.xcodeproj/project.pbxproj
+++ b/Examples/Schedule/Schedule.xcodeproj/project.pbxproj
@@ -138,7 +138,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0820;
-				LastUpgradeCheck = 1200;
+				LastUpgradeCheck = 1300;
 				ORGANIZATIONNAME = "Kishikawa Katsumi";
 				TargetAttributes = {
 					146730A41EBF561C003CF620 = {
@@ -264,7 +264,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -318,7 +318,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
diff --git a/Examples/Schedule/Schedule.xcodeproj/xcshareddata/xcschemes/Schedule.xcscheme b/Examples/Schedule/Schedule.xcodeproj/xcshareddata/xcschemes/Schedule.xcscheme
index 4e83af96..805cb33a 100644
--- a/Examples/Schedule/Schedule.xcodeproj/xcshareddata/xcschemes/Schedule.xcscheme
+++ b/Examples/Schedule/Schedule.xcodeproj/xcshareddata/xcschemes/Schedule.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1200"
+   LastUpgradeVersion = "1300"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Examples/Timetable/Timetable.xcodeproj/project.pbxproj b/Examples/Timetable/Timetable.xcodeproj/project.pbxproj
index 995515a6..92c43ca3 100644
--- a/Examples/Timetable/Timetable.xcodeproj/project.pbxproj
+++ b/Examples/Timetable/Timetable.xcodeproj/project.pbxproj
@@ -144,7 +144,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0820;
-				LastUpgradeCheck = 1200;
+				LastUpgradeCheck = 1300;
 				ORGANIZATIONNAME = "Kishikawa Katsumi";
 				TargetAttributes = {
 					140D6D0E1EC41F3500DFF8C1 = {
@@ -270,7 +270,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -324,7 +324,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
diff --git a/Examples/Timetable/Timetable.xcodeproj/xcshareddata/xcschemes/Timetable.xcscheme b/Examples/Timetable/Timetable.xcodeproj/xcshareddata/xcschemes/Timetable.xcscheme
index 36cff092..09887453 100644
--- a/Examples/Timetable/Timetable.xcodeproj/xcshareddata/xcschemes/Timetable.xcscheme
+++ b/Examples/Timetable/Timetable.xcodeproj/xcshareddata/xcschemes/Timetable.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1200"
+   LastUpgradeVersion = "1300"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Framework/Sources/SpreadsheetViewDataSource.swift b/Framework/Sources/SpreadsheetViewDataSource.swift
index 956ece08..a952c379 100644
--- a/Framework/Sources/SpreadsheetViewDataSource.swift
+++ b/Framework/Sources/SpreadsheetViewDataSource.swift
@@ -9,7 +9,7 @@
 import UIKit
 
 /// Implement this protocol to provide data to an `SpreadsheetView`.
-public protocol SpreadsheetViewDataSource: class {
+public protocol SpreadsheetViewDataSource: AnyObject {
     /// Asks your data source object for the number of columns in the spreadsheet view.
     ///
     /// - Parameter spreadsheetView: The spreadsheet view requesting this information.
diff --git a/Framework/Sources/SpreadsheetViewDelegate.swift b/Framework/Sources/SpreadsheetViewDelegate.swift
index 48514389..b23a39d6 100644
--- a/Framework/Sources/SpreadsheetViewDelegate.swift
+++ b/Framework/Sources/SpreadsheetViewDelegate.swift
@@ -11,7 +11,7 @@ import UIKit
 /// The `SpreadsheetViewDelegate` protocol defines methods that allow you to manage the selection and
 /// highlighting of cells in a spreadsheet view and to perform actions on those cells.
 /// The methods of this protocol are all optional.
-public protocol SpreadsheetViewDelegate: class {
+public protocol SpreadsheetViewDelegate: AnyObject {
     /// Asks the delegate if the cell should be highlighted during tracking.
     /// - Note: As touch events arrive, the spreadsheet view highlights cells in anticipation of the user selecting them.
     ///   As it processes those touch events, the collection view calls this method to ask your delegate if a given cell should be highlighted.