diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cd56f9c9..48296fb2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,12 +20,20 @@ jobs:
       matrix:
         xcode:
           - '26.2'
+          - '26.4'
     steps:
       - uses: actions/checkout@v5
       - name: Select Xcode ${{ matrix.xcode }}
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
       - name: Print Swift version
         run: swift --version
+      - name: Install Simulator Runtimes
+        if: matrix.xcode != '26.2'
+        uses: nick-fields/retry@v3
+        with:
+          timeout_minutes: 15
+          max_attempts: 3
+          command: xcodebuild -downloadAllPlatforms
       - name: Run tests (platforms)
         run: make test-platforms