diff --git a/.ci.yaml b/.ci.yaml
index af0af158ba5..95757cea15b 100644
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -90,12 +90,12 @@ platform_properties:
         [
           {"dependency": "ruby", "version": "ruby_3.1-pod_1.13"}
         ]
-      os: Mac-14|Mac-15.5
+      os: Mac-15.5
       device_type: none
       cpu: arm64
       $flutter/osx_sdk : >-
         {
-          "sdk_version": "16c5032a"
+          "sdk_version": "17a5241e"
         }
   mac_x64:
     properties:
@@ -103,12 +103,12 @@ platform_properties:
         [
           {"dependency": "ruby", "version": "ruby_3.1-pod_1.13"}
         ]
-      os: Mac-14|Mac-15.5
+      os: Mac-15.5
       device_type: none
       cpu: x86
       $flutter/osx_sdk : >-
         {
-          "sdk_version": "16c5032a"
+          "sdk_version": "17a5241e"
         }
 
 targets:
@@ -1085,7 +1085,6 @@ targets:
 
   - name: Mac_arm64 macos_platform_tests stable - packages
     recipe: packages/packages
-    presubmit: false
     timeout: 60
     properties:
       channel: stable
@@ -1229,7 +1228,6 @@ targets:
   # Don't run full platform tests on both channels in pre-submit.
   - name: Mac_arm64 ios_platform_tests_shard_1 stable
     recipe: packages/packages
-    presubmit: false
     timeout: 60
     properties:
       channel: stable
@@ -1244,7 +1242,6 @@ targets:
 
   - name: Mac_arm64 ios_platform_tests_shard_2 stable
     recipe: packages/packages
-    presubmit: false
     timeout: 60
     properties:
       channel: stable
@@ -1259,7 +1256,6 @@ targets:
 
   - name: Mac_arm64 ios_platform_tests_shard_3 stable
     recipe: packages/packages
-    presubmit: false
     timeout: 60
     properties:
       channel: stable
@@ -1274,7 +1270,6 @@ targets:
 
   - name: Mac_arm64 ios_platform_tests_shard_4 stable
     recipe: packages/packages
-    presubmit: false
     timeout: 60
     properties:
       channel: stable
@@ -1289,7 +1284,6 @@ targets:
 
   - name: Mac_arm64 ios_platform_tests_shard_5 stable
     recipe: packages/packages
-    presubmit: false
     timeout: 60
     properties:
       channel: stable
diff --git a/.ci/scripts/create_simulator.sh b/.ci/scripts/create_simulator.sh
index ace8261b635..ff695854ca9 100755
--- a/.ci/scripts/create_simulator.sh
+++ b/.ci/scripts/create_simulator.sh
@@ -9,7 +9,7 @@ set -o pipefail
 # The name here must match remove_simulator.sh
 readonly DEVICE_NAME=Flutter-iPhone
 readonly DEVICE=com.apple.CoreSimulator.SimDeviceType.iPhone-14
-readonly OS=com.apple.CoreSimulator.SimRuntime.iOS-18-2
+readonly OS=com.apple.CoreSimulator.SimRuntime.iOS-26-0
 
 # Delete any existing devices named Flutter-iPhone. Having more than one may
 # cause issues when builds target the device.
diff --git a/.ci/targets/ios_platform_tests.yaml b/.ci/targets/ios_platform_tests.yaml
index a2b01241e73..81db8791c80 100644
--- a/.ci/targets/ios_platform_tests.yaml
+++ b/.ci/targets/ios_platform_tests.yaml
@@ -22,7 +22,7 @@ tasks:
   - name: native test
     script: .ci/scripts/tool_runner.sh
     # Simulator name and version must match name and version in create_simulator.sh
-    args: ["native-test", "--ios", "--ios-destination", "platform=iOS Simulator,name=Flutter-iPhone,OS=18.2", "--xcode-warnings-exceptions=script/configs/xcode_warnings_exceptions.yaml"]
+    args: ["native-test", "--ios", "--ios-destination", "platform=iOS Simulator,name=Flutter-iPhone,OS=26.0", "--xcode-warnings-exceptions=script/configs/xcode_warnings_exceptions.yaml"]
   - name: boot simulator
     # Ensure simulator is still booted
     script: .ci/scripts/boot_simulator.sh
diff --git a/packages/pigeon/tool/shared/test_suites.dart b/packages/pigeon/tool/shared/test_suites.dart
index a16afe0c2e7..bbe639ef1bc 100644
--- a/packages/pigeon/tool/shared/test_suites.dart
+++ b/packages/pigeon/tool/shared/test_suites.dart
@@ -327,8 +327,8 @@ Future<int> _runIOSPluginUnitTests(String testPluginPath) async {
 
   const String deviceName = 'Pigeon-Test-iPhone';
   const String deviceType = 'com.apple.CoreSimulator.SimDeviceType.iPhone-14';
-  const String deviceRuntime = 'com.apple.CoreSimulator.SimRuntime.iOS-18-2';
-  const String deviceOS = '18.2';
+  const String deviceRuntime = 'com.apple.CoreSimulator.SimRuntime.iOS-26-0';
+  const String deviceOS = '26.0';
   await _createSimulator(deviceName, deviceType, deviceRuntime);
   return runXcodeBuild(
     '$examplePath/ios',