diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b183b5d7..7355d66d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -90,6 +90,25 @@ jobs:
       runs-on: macos-latest
       enable-thread-sanitizer: true
 
+  macOS_Xcode264:
+    uses: ./.github/workflows/build-macos.yml
+    with:
+      xcode-version: '26.4'
+      runs-on: macos-26
+
+  macOS_Xcode264_Sanitizers:
+    uses: ./.github/workflows/build-macos.yml
+    with:
+      xcode-version: '26.4'
+      runs-on: macos-26
+      enable-sanitizers: true
+
+  macOS_Xcode264_ThreadSanitizer:
+    uses: ./.github/workflows/build-macos.yml
+    with:
+      xcode-version: '26.4'
+      runs-on: macos-26
+      enable-thread-sanitizer: true
 
   # ── iOS ───────────────────────────────────────────────────────
   iOS_Xcode164:
@@ -99,12 +118,12 @@ jobs:
       runs-on: macos-latest
       simulator: 'iPhone 16'
 
-  iOS_Xcode152:
+  iOS_Xcode264:
     uses: ./.github/workflows/build-ios.yml
     with:
-      xcode-version: '15.2'
-      runs-on: macos-14
-      simulator: 'iPhone 15'
+      xcode-version: '26.4'
+      runs-on: macos-26
+      simulator: 'iPhone 17'
 
   # ── Linux ─────────────────────────────────────────────────────
   Ubuntu_gcc: