diff --git a/.github/workflows/carthage.yml b/.github/workflows/carthage.yml
index 600eadda3..ba4f8d5e4 100644
--- a/.github/workflows/carthage.yml
+++ b/.github/workflows/carthage.yml
@@ -13,7 +13,7 @@ on:
 jobs:
   carthage:
     name: Carthage Build
-    runs-on: macos-12
+    runs-on: macos-14
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/ci-swiftpm.yml b/.github/workflows/ci-swiftpm.yml
index 30290ce7e..f58ed9b58 100644
--- a/.github/workflows/ci-swiftpm.yml
+++ b/.github/workflows/ci-swiftpm.yml
@@ -11,24 +11,24 @@ on:
       - "*"
 
 jobs:
-  swiftpm_darwin_monterey:
+  swiftpm_darwin_ventura:
     name: SwiftPM, Darwin, Xcode ${{ matrix.xcode }}
-    runs-on: macos-12
+    runs-on: macos-13
     strategy:
       matrix:
-        xcode: ["14.0.1", "14.1", "14.2"]
+        xcode: ["14.1"]
     env:
       DEVELOPER_DIR: "/Applications/Xcode_${{ matrix.xcode }}.app"
     steps:
       - uses: actions/checkout@v4
       - run: ./test swiftpm
 
-  swiftpm_darwin_ventura:
+  swiftpm_darwin_sonoma:
     name: SwiftPM, Darwin, Xcode ${{ matrix.xcode }}
-    runs-on: macos-13
+    runs-on: macos-14
     strategy:
       matrix:
-        xcode: ["14.3.1"]
+        xcode: ["15.4", "16.1"]
     env:
       DEVELOPER_DIR: "/Applications/Xcode_${{ matrix.xcode }}.app"
     steps:
@@ -43,6 +43,8 @@ jobs:
         container:
           - swift:5.7
           - swift:5.8
+          - swift:5.9
+          - swift:6.0
           # - swiftlang/swift:nightly
       fail-fast: false
     container: ${{ matrix.container }}
diff --git a/.github/workflows/ci-xcode.yml b/.github/workflows/ci-xcode.yml
index 8e55af81b..4ef628041 100644
--- a/.github/workflows/ci-xcode.yml
+++ b/.github/workflows/ci-xcode.yml
@@ -11,12 +11,12 @@ on:
       - "*"
 
 jobs:
-  xcode_monterey:
+  xcode_ventura:
     name: Xcode ${{ matrix.xcode }} (Xcode Project)
-    runs-on: macos-12
+    runs-on: macos-13
     strategy:
       matrix:
-        xcode: ["14.0.1", "14.1", "14.2"]
+        xcode: ["14.3.1"]
       fail-fast: false
     env:
       DEVELOPER_DIR: "/Applications/Xcode_${{ matrix.xcode }}.app"
@@ -27,12 +27,12 @@ jobs:
       - run: ./test tvos
       - run: ./test watchos
 
-  xcode_ventura:
+  xcode_sonoma:
     name: Xcode ${{ matrix.xcode }} (Xcode Project)
     runs-on: macos-13
     strategy:
       matrix:
-        xcode: ["14.3.1"]
+        xcode: ["15.4", "16.1"]
       fail-fast: false
     env:
       DEVELOPER_DIR: "/Applications/Xcode_${{ matrix.xcode }}.app"
@@ -45,10 +45,10 @@ jobs:
 
   xcode_spm:
     name: Xcode ${{ matrix.xcode }} (Swift Package)
-    runs-on: macos-12
+    runs-on: macos-14
     strategy:
       matrix:
-        xcode: ["14.0.1"]
+        xcode: ["16.1"]
       fail-fast: false
     env:
       DEVELOPER_DIR: "/Applications/Xcode_${{ matrix.xcode }}.app"
diff --git a/.github/workflows/cocoapods.yml b/.github/workflows/cocoapods.yml
index 65fae6e9e..6310578ba 100644
--- a/.github/workflows/cocoapods.yml
+++ b/.github/workflows/cocoapods.yml
@@ -13,7 +13,7 @@ on:
 jobs:
   cocoapods:
     name: CocoaPods Lint
-    runs-on: macos-12
+    runs-on: macos-14
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 47aedb845..eeee90184 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -7,10 +7,10 @@ on:
 jobs:
   carthage_archive:
     name: Darwin, Xcode 14.0
-    runs-on: macos-12
+    runs-on: macos-14
     strategy:
       matrix:
-        xcode: ["14.0.1"]
+        xcode: ["16.1"]
     env:
       DEVELOPER_DIR: "/Applications/Xcode_${{ matrix.xcode }}.app"
     steps: