diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index f997f83..60dfb61 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -1,4 +1,4 @@
-name: Swift
+name: CI
 
 on:
   push:
@@ -8,22 +8,25 @@ on:
 
 jobs:
   build:
-    runs-on: macos-latest
+    runs-on: macos-13
     strategy:
       matrix:
-        destination: ['platform=iOS Simulator,OS=11.0,name=iPhone 8', 'platform=iOS Simulator,OS=16.2,name=iPhone 14']
+        xcode:
+        - '15.0' # Swift 5.9
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Build
-        run: xcodebuild clean build -scheme HorizonCalendar
+        run: xcodebuild clean build -scheme HorizonCalendar -destination "generic/platform=iOS Simulator"
       - name: Run tests
-        run: xcodebuild clean test -project HorizonCalendar.xcodeproj -scheme HorizonCalendar -destination "name=iPhone 8,OS=16.2"
+        run: xcodebuild clean test -project HorizonCalendar.xcodeproj -scheme HorizonCalendar -destination "name=iPhone 14,OS=17.2"
 
   lint-swift:
     runs-on: macos-13
+    strategy:
+      matrix:
+        xcode:
+        - '15.0' # Swift 5.9
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Lint Swift
         run: swift package --allow-writing-to-package-directory format --lint
-
-
diff --git a/HorizonCalendar.podspec b/HorizonCalendar.podspec
index 6a959c1..5c2942c 100644
--- a/HorizonCalendar.podspec
+++ b/HorizonCalendar.podspec
@@ -36,7 +36,7 @@ Features:
   spec.homepage = "https://github.com/airbnb/HorizonCalendar"
   spec.authors = { "Bryan Keller" => "kellerbryan19@gmail.com" }
   spec.social_media_url = "https://twitter.com/BKYourWay19"
-  spec.swift_version = "5.8"
-  spec.ios.deployment_target = '11.0'
+  spec.swift_version = "5.9"
+  spec.ios.deployment_target = '12.0'
   spec.source_files = "Sources/**/*.{swift,h}"
 end
diff --git a/HorizonCalendar.xcodeproj/project.pbxproj b/HorizonCalendar.xcodeproj/project.pbxproj
index 4d870e6..59b19f7 100644
--- a/HorizonCalendar.xcodeproj/project.pbxproj
+++ b/HorizonCalendar.xcodeproj/project.pbxproj
@@ -565,6 +565,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -622,6 +623,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				SWIFT_VERSION = 5.0;
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -644,7 +646,7 @@
 				GCC_WARN_UNUSED_PARAMETER = YES;
 				INFOPLIST_FILE = Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -678,7 +680,7 @@
 				GCC_WARN_UNUSED_PARAMETER = YES;
 				INFOPLIST_FILE = Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -702,7 +704,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = 5Q5SGQT2R4;
 				INFOPLIST_FILE = Tests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -722,7 +724,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = 5Q5SGQT2R4;
 				INFOPLIST_FILE = Tests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
diff --git a/Package.swift b/Package.swift
index ab6551f..a28776f 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,11 +1,10 @@
-// swift-tools-version:5.8
-
+// swift-tools-version: 5.9
 import PackageDescription
 
 let package = Package(
   name: "HorizonCalendar",
   platforms: [
-    .iOS(.v11),
+    .iOS(.v12),
   ],
   products: [
     .library(name: "HorizonCalendar", targets: ["HorizonCalendar"]),