diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 9c63cf1..47c6b60 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -25,15 +25,16 @@ jobs:
             fail-fast: true
             matrix:
                 xcodebuildCommand:
-                    - "-sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 17'"
+                    - "-sdk iphonesimulator -destination 'platform=iOS Simulator,OS=26.5,name=iPhone 17'"
                     - "-sdk macosx -destination 'platform=macOS'"
-                    - "-sdk xrsimulator -destination 'platform=visionOS Simulator,name=Apple Vision Pro'"
-                    - "-sdk appletvsimulator -destination 'platform=tvOS Simulator,name=Apple TV 4K (3rd generation)'"
-                    - "-sdk watchsimulator -destination 'platform=watchOS Simulator,name=Apple Watch Series 11 (46mm)'"
+                    - "-sdk xrsimulator -destination 'platform=visionOS Simulator,OS=26.5,name=Apple Vision Pro'"
+                    - "-sdk appletvsimulator -destination 'platform=tvOS Simulator,OS=26.5,name=Apple TV 4K (3rd generation)'"
+                    - "-sdk watchsimulator -destination 'platform=watchOS Simulator,OS=26.5,name=Apple Watch Series 11 (46mm)'"
+                    - "build -destination 'platform=macOS,variant=Mac Catalyst'"
         steps:
             - name: Repository checkout
               uses: actions/checkout@v6
             - name: Select Xcode version
-              run: sudo xcode-select -s '/Applications/Xcode_26.4.1.app/Contents/Developer'
+              run: sudo xcode-select -s '/Applications/Xcode_26.5.0.app/Contents/Developer'
             - name: Build and Test
               run: xcodebuild test -scheme TelemetryDeck-Package ${{ matrix.xcodebuildCommand }}
diff --git a/Tests/TelemetryDeckTests/SignalManagerBackoffTests.swift b/Tests/TelemetryDeckTests/SignalManagerBackoffTests.swift
index cfb2790..424cafa 100644
--- a/Tests/TelemetryDeckTests/SignalManagerBackoffTests.swift
+++ b/Tests/TelemetryDeckTests/SignalManagerBackoffTests.swift
@@ -66,7 +66,7 @@ struct SignalManagerBackoffTests {
     private func waitForConsecutiveFailures(
         _ manager: SignalManager,
         toEqual expected: Int,
-        timeout: TimeInterval = 5
+        timeout: TimeInterval = 15
     ) async throws {
         let deadline = Date().addingTimeInterval(timeout)
         while manager.consecutiveFailuresForTesting != expected, Date() < deadline {
diff --git a/Tests/TelemetryDeckTests/SignalManagerDispositionTests.swift b/Tests/TelemetryDeckTests/SignalManagerDispositionTests.swift
index 9b06cee..2c72e4b 100644
--- a/Tests/TelemetryDeckTests/SignalManagerDispositionTests.swift
+++ b/Tests/TelemetryDeckTests/SignalManagerDispositionTests.swift
@@ -66,7 +66,7 @@ struct SignalManagerDispositionTests {
     private func waitForConsecutiveFailures(
         _ manager: SignalManager,
         toEqual expected: Int,
-        timeout: TimeInterval = 5
+        timeout: TimeInterval = 15
     ) async throws {
         let deadline = Date().addingTimeInterval(timeout)
         while manager.consecutiveFailuresForTesting != expected, Date() < deadline {
@@ -77,7 +77,7 @@ struct SignalManagerDispositionTests {
     private func waitForSendCompletion(
         _ manager: SignalManager,
         toReach expected: Int,
-        timeout: TimeInterval = 5
+        timeout: TimeInterval = 15
     ) async throws {
         let deadline = Date().addingTimeInterval(timeout)
         while manager.sendCompletionsForTesting < expected, Date() < deadline {