diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c9d77873..87660098 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -8,13 +8,13 @@ on:
 jobs:
   release:
     name: Publish GitHub and Cocoapods release
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
       - name: Checkout
         uses: actions/checkout@v2
 
       - name: Select Xcode version
-        run: sudo xcode-select --switch /Applications/Xcode_14.1.app
+        run: sudo xcode-select --switch /Applications/Xcode_15.2.app
 
       - name: Build
         run: |
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ac1ea6b3..b6eec045 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -14,12 +14,12 @@ on:
 jobs:
   test:
     name: Run tests on macOS
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Select Xcode version
-        run: sudo xcode-select --switch /Applications/Xcode_14.1.app
+        run: sudo xcode-select --switch /Applications/Xcode_15.2.app
       - name: Build and test
         run: swift test --enable-code-coverage --disable-automatic-resolution
         shell: bash
diff --git a/Sources/XcodeExport/Model/XcodeExportExtensions.swift b/Sources/XcodeExport/Model/XcodeExportExtensions.swift
index 24142c0b..1ab3d95b 100644
--- a/Sources/XcodeExport/Model/XcodeExportExtensions.swift
+++ b/Sources/XcodeExport/Model/XcodeExportExtensions.swift
@@ -49,7 +49,7 @@ extension XcodeAssetContents {
 
     func makeFileContents(to directory: URL) throws -> FileContents {
         let encoder = JSONEncoder()
-        encoder.outputFormatting = .prettyPrinted
+        encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
 
         let data = try encoder.encode(self)
         let fileURL = URL(string: "Contents.json")!
diff --git a/Sources/XcodeExport/XcodeColorExporter.swift b/Sources/XcodeExport/XcodeColorExporter.swift
index f8d2b80c..b9da3038 100644
--- a/Sources/XcodeExport/XcodeColorExporter.swift
+++ b/Sources/XcodeExport/XcodeColorExporter.swift
@@ -219,7 +219,7 @@ final public class XcodeColorExporter: XcodeExporterBase {
 
     private func makeXcodeAssetFileContents(contents: XcodeAssetContents, directory: URL) throws -> FileContents {
         let encoder = JSONEncoder()
-        encoder.outputFormatting = .prettyPrinted
+        encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
         let data = try encoder.encode(contents)
         let fileURL = URL(string: "Contents.json")!
         return FileContents(
diff --git a/Tests/XcodeExportTests/XcodeIconsExporterTests.swift b/Tests/XcodeExportTests/XcodeIconsExporterTests.swift
index c32be6a4..64ba1440 100644
--- a/Tests/XcodeExportTests/XcodeIconsExporterTests.swift
+++ b/Tests/XcodeExportTests/XcodeIconsExporterTests.swift
@@ -667,17 +667,17 @@ final class XcodeIconsExporterTests: XCTestCase {
         {
           "images" : [
             {
-              "idiom" : "universal",
-              "filename" : "ic24TabBarHome.pdf"
+              "filename" : "ic24TabBarHome.pdf",
+              "idiom" : "universal"
             }
           ],
           "info" : {
-            "version" : 1,
-            "author" : "xcode"
+            "author" : "xcode",
+            "version" : 1
           },
           "properties" : {
-            "template-rendering-intent" : "template",
-            "preserves-vector-representation" : true
+            "preserves-vector-representation" : true,
+            "template-rendering-intent" : "template"
           }
         }
         """
@@ -711,17 +711,17 @@ final class XcodeIconsExporterTests: XCTestCase {
         {
           "images" : [
             {
-              "idiom" : "universal",
-              "filename" : "ic24TabBarHome.pdf"
+              "filename" : "ic24TabBarHome.pdf",
+              "idiom" : "universal"
             }
           ],
           "info" : {
-            "version" : 1,
-            "author" : "xcode"
+            "author" : "xcode",
+            "version" : 1
           },
           "properties" : {
-            "template-rendering-intent" : "template",
-            "preserves-vector-representation" : true
+            "preserves-vector-representation" : true,
+            "template-rendering-intent" : "template"
           }
         }
         """