diff --git a/CMakeLists.txt b/CMakeLists.txt
index e76ce7d0f9f..3143251bb08 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -630,6 +630,17 @@ set(COMPATIBILITY_MINIMUM_DEPLOYMENT_VERSION_WATCHOS "2.0")
 set(COMPATIBILITY_MINIMUM_DEPLOYMENT_VERSION_XROS "1.0")
 set(COMPATIBILITY_MINIMUM_DEPLOYMENT_VERSION_MACCATALYST "13.1")
 
+set(SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_OSX "${SWIFT_DARWIN_DEPLOYMENT_VERSION_OSX}" CACHE STRING
+    "Deployment target version for building macOS tests")
+set(SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_IOS "${SWIFT_DARWIN_DEPLOYMENT_VERSION_IOS}" CACHE STRING
+    "Deployment target version for building iOS tests")
+set(SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_TVOS "${SWIFT_DARWIN_DEPLOYMENT_VERSION_TVOS}" CACHE STRING
+    "Deployment target version for building tvOS tests")
+set(SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_WATCHOS "${SWIFT_DARWIN_DEPLOYMENT_VERSION_WATCHOS}" CACHE STRING
+    "Deployment target version for building watchOS tests")
+set(SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_XROS "${SWIFT_DARWIN_DEPLOYMENT_VERSION_XROS}" CACHE STRING
+    "Deployment target version for building visionOS tests")
+
 #
 # User-configurable debugging options.
 #
diff --git a/cmake/modules/DarwinSDKs.cmake b/cmake/modules/DarwinSDKs.cmake
index 7441403a36b..5d4d1ea59e8 100644
--- a/cmake/modules/DarwinSDKs.cmake
+++ b/cmake/modules/DarwinSDKs.cmake
@@ -12,7 +12,8 @@ is_sdk_requested(OSX swift_build_osx)
 if(swift_build_osx)
   configure_sdk_darwin(
       OSX "OS X" "${SWIFT_DARWIN_DEPLOYMENT_VERSION_OSX}"
-      macosx macosx macos macOS "${SUPPORTED_OSX_ARCHS}")
+      macosx macosx macos macOS "${SUPPORTED_OSX_ARCHS}"
+      "${SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_OSX}")
   configure_target_variant(OSX-DA "OS X Debug+Asserts"   OSX DA "Debug+Asserts")
   configure_target_variant(OSX-RA "OS X Release+Asserts" OSX RA "Release+Asserts")
   configure_target_variant(OSX-R  "OS X Release"         OSX R  "Release")
@@ -36,7 +37,8 @@ if(swift_build_freestanding AND (SWIFT_FREESTANDING_FLAVOR STREQUAL "apple"))
       FREESTANDING "FREESTANDING" "${SWIFT_FREESTANDING_DEPLOYMENT_VERSION}"
       "${SWIFT_FREESTANDING_SDK}"
       "${SWIFT_FREESTANDING_TRIPLE_NAME}" "${SWIFT_FREESTANDING_MODULE_NAME}"
-      "${SWIFT_FREESTANDING_AVAILABILITY_NAME}" "${SWIFT_FREESTANDING_ARCHS}")
+      "${SWIFT_FREESTANDING_AVAILABILITY_NAME}" "${SWIFT_FREESTANDING_ARCHS}"
+      "${SWIFT_FREESTANDING_DEPLOYMENT_VERSION}")
   set(SWIFT_SDK_FREESTANDING_LIB_SUBDIR "freestanding")
   configure_target_variant(FREESTANDING-DA "FREESTANDING Debug+Asserts"   FREESTANDING DA "Debug+Asserts")
   configure_target_variant(FREESTANDING-RA "FREESTANDING Release+Asserts" FREESTANDING RA "Release+Asserts")
@@ -54,7 +56,8 @@ is_sdk_requested(IOS swift_build_ios)
 if(swift_build_ios)
   configure_sdk_darwin(
       IOS "iOS" "${SWIFT_DARWIN_DEPLOYMENT_VERSION_IOS}"
-      iphoneos ios ios iOS "${SUPPORTED_IOS_ARCHS}")
+      iphoneos ios ios iOS "${SUPPORTED_IOS_ARCHS}"
+      "${SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_IOS}")
   configure_target_variant(IOS-DA "iOS Debug+Asserts"   IOS DA "Debug+Asserts")
   configure_target_variant(IOS-RA "iOS Release+Asserts" IOS RA "Release+Asserts")
   configure_target_variant(IOS-R  "iOS Release"         IOS R "Release")
@@ -65,7 +68,8 @@ if(swift_build_ios_simulator)
   configure_sdk_darwin(
       IOS_SIMULATOR "iOS Simulator" "${SWIFT_DARWIN_DEPLOYMENT_VERSION_IOS}"
       iphonesimulator ios ios-simulator iOS
-      "${SUPPORTED_IOS_SIMULATOR_ARCHS}")
+      "${SUPPORTED_IOS_SIMULATOR_ARCHS}"
+      "${SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_IOS}")
   configure_target_variant(
       IOS_SIMULATOR-DA "iOS Debug+Asserts"   IOS_SIMULATOR DA "Debug+Asserts")
   configure_target_variant(
@@ -78,7 +82,8 @@ is_sdk_requested(TVOS swift_build_tvos)
 if(swift_build_tvos)
   configure_sdk_darwin(
       TVOS "tvOS" "${SWIFT_DARWIN_DEPLOYMENT_VERSION_TVOS}"
-      appletvos tvos tvos tvOS "${SUPPORTED_TVOS_ARCHS}")
+      appletvos tvos tvos tvOS "${SUPPORTED_TVOS_ARCHS}"
+      "${SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_TVOS}")
   configure_target_variant(TVOS-DA "tvOS Debug+Asserts"   TVOS DA "Debug+Asserts")
   configure_target_variant(TVOS-RA "tvOS Release+Asserts" TVOS RA "Release+Asserts")
   configure_target_variant(TVOS-R  "tvOS Release"         TVOS R "Release")
@@ -89,7 +94,8 @@ if(swift_build_tvos_simulator)
   configure_sdk_darwin(
       TVOS_SIMULATOR "tvOS Simulator" "${SWIFT_DARWIN_DEPLOYMENT_VERSION_TVOS}"
       appletvsimulator tvos tvos-simulator tvOS
-      "${SUPPORTED_TVOS_SIMULATOR_ARCHS}")
+      "${SUPPORTED_TVOS_SIMULATOR_ARCHS}"
+      "${SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_TVOS}")
   configure_target_variant(
     TVOS_SIMULATOR-DA "tvOS Debug+Asserts"   TVOS_SIMULATOR DA "Debug+Asserts")
   configure_target_variant(
@@ -102,7 +108,8 @@ is_sdk_requested(WATCHOS swift_build_watchos)
 if(swift_build_watchos)
   configure_sdk_darwin(
       WATCHOS "watchOS" "${SWIFT_DARWIN_DEPLOYMENT_VERSION_WATCHOS}"
-      watchos watchos watchos watchOS "${SUPPORTED_WATCHOS_ARCHS}")
+      watchos watchos watchos watchOS "${SUPPORTED_WATCHOS_ARCHS}"
+      "${SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_WATCHOS}")
   configure_target_variant(WATCHOS-DA "watchOS Debug+Asserts"   WATCHOS DA "Debug+Asserts")
   configure_target_variant(WATCHOS-RA "watchOS Release+Asserts" WATCHOS RA "Release+Asserts")
   configure_target_variant(WATCHOS-R  "watchOS Release"         WATCHOS R "Release")
@@ -113,7 +120,8 @@ if(swift_build_watchos_simulator)
   configure_sdk_darwin(
       WATCHOS_SIMULATOR "watchOS Simulator" "${SWIFT_DARWIN_DEPLOYMENT_VERSION_WATCHOS}"
       watchsimulator watchos watchos-simulator watchOS
-      "${SUPPORTED_WATCHOS_SIMULATOR_ARCHS}")
+      "${SUPPORTED_WATCHOS_SIMULATOR_ARCHS}"
+      "${SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_WATCHOS}")
   configure_target_variant(WATCHOS_SIMULATOR-DA "watchOS Debug+Asserts"   WATCHOS_SIMULATOR DA "Debug+Asserts")
   configure_target_variant(WATCHOS_SIMULATOR-RA "watchOS Release+Asserts" WATCHOS_SIMULATOR RA "Release+Asserts")
   configure_target_variant(WATCHOS_SIMULATOR-R  "watchOS Release"         WATCHOS_SIMULATOR R "Release")
@@ -123,7 +131,8 @@ is_sdk_requested(XROS swift_build_xros)
 if(swift_build_xros)
   configure_sdk_darwin(
       XROS "xrOS" "${SWIFT_DARWIN_DEPLOYMENT_VERSION_XROS}"
-      xros xros xros visionOS "${SUPPORTED_XROS_ARCHS}")
+      xros xros xros visionOS "${SUPPORTED_XROS_ARCHS}"
+      "${SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_XROS}")
   configure_target_variant(XROS-DA "xrOS Debug+Asserts"   XROS DA "Debug+Asserts")
   configure_target_variant(XROS-RA "xrOS Release+Asserts" XROS RA "Release+Asserts")
   configure_target_variant(XROS-R  "xrOS Release"         XROS R "Release")
@@ -134,7 +143,8 @@ if(swift_build_xros_simulator)
   configure_sdk_darwin(
       XROS_SIMULATOR "xrOS Simulator" "${SWIFT_DARWIN_DEPLOYMENT_VERSION_XROS}"
       xrsimulator xros xros-simulator visionOS
-      "${SUPPORTED_XROS_SIMULATOR_ARCHS}")
+      "${SUPPORTED_XROS_SIMULATOR_ARCHS}"
+      "${SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_XROS}")
 
   configure_target_variant(
       XROS_SIMULATOR-DA "xrOS Simulator Debug+Asserts"   XROS_SIMULATOR DA "Debug+Asserts")
diff --git a/cmake/modules/SwiftConfigureSDK.cmake b/cmake/modules/SwiftConfigureSDK.cmake
index 7e87711feac..bdc9f9fb272 100644
--- a/cmake/modules/SwiftConfigureSDK.cmake
+++ b/cmake/modules/SwiftConfigureSDK.cmake
@@ -32,6 +32,7 @@ function(_report_sdk prefix)
     message(STATUS "  Version: ${SWIFT_SDK_${prefix}_VERSION}")
     message(STATUS "  Build number: ${SWIFT_SDK_${prefix}_BUILD_NUMBER}")
     message(STATUS "  Deployment version: ${SWIFT_SDK_${prefix}_DEPLOYMENT_VERSION}")
+    message(STATUS "  Deployment version for tests: ${SWIFT_SDK_${prefix}_TEST_DEPLOYMENT_VERSION}")
     message(STATUS "  Triple name: ${SWIFT_SDK_${prefix}_TRIPLE_NAME}")
     message(STATUS "  Simulator: ${SWIFT_SDK_${prefix}_IS_SIMULATOR}")
   endif()
@@ -138,6 +139,7 @@ endfunction()
 #     triple_name        # The name used in Swift's -triple
 #     availability_name  # The name used in Swift's @availability
 #     architectures      # A list of architectures this SDK supports
+#     test_deployment_version # Deployment versions to be used for tests
 #   )
 #
 # Sadly there are three OS naming conventions.
@@ -170,7 +172,8 @@ endfunction()
 #
 macro(configure_sdk_darwin
     prefix name deployment_version xcrun_name
-    triple_name module_name availability_name architectures)
+    triple_name module_name availability_name architectures
+    test_deployment_version)
   # Note: this has to be implemented as a macro because it sets global
   # variables.
 
@@ -202,6 +205,11 @@ macro(configure_sdk_darwin
   # Set other variables.
   set(SWIFT_SDK_${prefix}_NAME "${name}")
   set(SWIFT_SDK_${prefix}_DEPLOYMENT_VERSION "${deployment_version}")
+  if(NOT "${test_deployment_version}" STREQUAL "")
+    set(SWIFT_SDK_${prefix}_TEST_DEPLOYMENT_VERSION "${test_deployment_version}")
+  else()
+    set(SWIFT_SDK_${prefix}_TEST_DEPLOYMENT_VERSION "${deployment_version}")
+  endif()
   set(SWIFT_SDK_${prefix}_LIB_SUBDIR "${xcrun_name}")
   set(SWIFT_SDK_${prefix}_TRIPLE_NAME "${triple_name}")
   set(SWIFT_SDK_${prefix}_AVAILABILITY_NAME "${availability_name}")
diff --git a/test/cmake/modules/SwiftTestUtils.cmake b/test/cmake/modules/SwiftTestUtils.cmake
index 746c25d416d..1bdbab8cc61 100644
--- a/test/cmake/modules/SwiftTestUtils.cmake
+++ b/test/cmake/modules/SwiftTestUtils.cmake
@@ -30,7 +30,7 @@ function(get_swift_test_versioned_target_triple variant_triple_out_var sdk arch
     # Use the macCatalyst target triple and compiler resources for the iOS-like build flavor.
     set(variant_triple "${arch}-apple-ios13.1-macabi")
   else()
-    get_versioned_target_triple(variant_triple ${sdk} ${arch} "${SWIFT_SDK_${sdk}_DEPLOYMENT_VERSION}")
+    get_versioned_target_triple(variant_triple ${sdk} ${arch} "${SWIFT_SDK_${sdk}_TEST_DEPLOYMENT_VERSION}")
   endif()
 
   set(${variant_triple_out_var} "${variant_triple}" PARENT_SCOPE)
diff --git a/utils/build_swift/build_swift/driver_arguments.py b/utils/build_swift/build_swift/driver_arguments.py
index e47fd450231..6a62e11b47b 100644
--- a/utils/build_swift/build_swift/driver_arguments.py
+++ b/utils/build_swift/build_swift/driver_arguments.py
@@ -549,6 +549,27 @@ def create_argument_parser():
            metavar='MAJOR.MINOR',
            help='minimum deployment target version for xrOS')
 
+    option('--darwin-test-deployment-version-osx', store,
+           default=defaults.DARWIN_DEPLOYMENT_VERSION_OSX,
+           metavar='MAJOR.MINOR',
+           help='deployment target version to use when building macOS tests')
+    option('--darwin-test-deployment-version-ios', store,
+           default=defaults.DARWIN_DEPLOYMENT_VERSION_IOS,
+           metavar='MAJOR.MINOR',
+           help='deployment target version to use when building iOS tests')
+    option('--darwin-test-deployment-version-tvos', store,
+           default=defaults.DARWIN_DEPLOYMENT_VERSION_TVOS,
+           metavar='MAJOR.MINOR',
+           help='deployment target version to use when building tvOS tests')
+    option('--darwin-test-deployment-version-watchos', store,
+           default=defaults.DARWIN_DEPLOYMENT_VERSION_WATCHOS,
+           metavar='MAJOR.MINOR',
+           help='deployment target version to use when building watchOS tests')
+    option('--darwin-test-deployment-version-xros', store,
+           default=defaults.DARWIN_DEPLOYMENT_VERSION_XROS,
+           metavar='MAJOR.MINOR',
+           help='deployment target version to use when building visionOS tests')
+
     option('--extra-cmake-options', append,
            type=argparse.ShellSplitType(),
            help='Pass through extra options to CMake in the form of comma '
diff --git a/utils/build_swift/tests/expected_options.py b/utils/build_swift/tests/expected_options.py
index dddb505174e..be2939b7e34 100644
--- a/utils/build_swift/tests/expected_options.py
+++ b/utils/build_swift/tests/expected_options.py
@@ -169,6 +169,16 @@ EXPECTED_DEFAULTS = {
         defaults.DARWIN_DEPLOYMENT_VERSION_WATCHOS,
     'darwin_deployment_version_xros':
         defaults.DARWIN_DEPLOYMENT_VERSION_XROS,
+    'darwin_test_deployment_version_osx':
+        defaults.DARWIN_DEPLOYMENT_VERSION_OSX,
+    'darwin_test_deployment_version_ios':
+        defaults.DARWIN_DEPLOYMENT_VERSION_IOS,
+    'darwin_test_deployment_version_tvos':
+        defaults.DARWIN_DEPLOYMENT_VERSION_TVOS,
+    'darwin_test_deployment_version_watchos':
+        defaults.DARWIN_DEPLOYMENT_VERSION_WATCHOS,
+    'darwin_test_deployment_version_xros':
+        defaults.DARWIN_DEPLOYMENT_VERSION_XROS,
     'darwin_symroot_path_filters': [],
     'darwin_xcrun_toolchain': None,
     'distcc': False,
@@ -805,6 +815,11 @@ EXPECTED_OPTIONS = [
     StrOption('--darwin-deployment-version-tvos'),
     StrOption('--darwin-deployment-version-watchos'),
     StrOption('--darwin-deployment-version-xros'),
+    StrOption('--darwin-test-deployment-version-osx'),
+    StrOption('--darwin-test-deployment-version-ios'),
+    StrOption('--darwin-test-deployment-version-tvos'),
+    StrOption('--darwin-test-deployment-version-watchos'),
+    StrOption('--darwin-test-deployment-version-xros'),
     DisableOption('--skip-test-xros-host', dest='test_xros_host'),
     DisableOption('--skip-test-xros', dest='test_xros'),
     DisableOption('--skip-test-xros-simulator', dest='test_xros_simulator'),
diff --git a/utils/swift_build_support/swift_build_support/products/swift.py b/utils/swift_build_support/swift_build_support/products/swift.py
index 97cac9b3924..80fb099da8b 100644
--- a/utils/swift_build_support/swift_build_support/products/swift.py
+++ b/utils/swift_build_support/swift_build_support/products/swift.py
@@ -106,6 +106,9 @@ class Swift(product.Product):
         self.cmake_options.extend(
             self._enable_new_runtime_build)
 
+        self.cmake_options.extend(
+            self._darwin_test_deployment_versions)
+
         self.cmake_options.extend_raw(self.args.extra_swift_cmake_options)
 
     @classmethod
@@ -307,6 +310,19 @@ updated without updating swift.py?")
         return [('SWIFT_ENABLE_NEW_RUNTIME_BUILD:BOOL',
                  self.args.enable_new_runtime_build)]
 
+    @property
+    def _darwin_test_deployment_versions(self):
+        return [('SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_OSX:STRING',
+                 self.args.darwin_test_deployment_version_osx),
+                 ('SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_IOS:STRING',
+                   self.args.darwin_test_deployment_version_ios),
+                 ('SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_TVOS:STRING',
+                   self.args.darwin_test_deployment_version_tvos),
+                 ('SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_WATCHOS:STRING',
+                   self.args.darwin_test_deployment_version_watchos),
+                 ('SWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_XROS:STRING',
+                   self.args.darwin_test_deployment_version_xros)]
+
     def _handle_swift_debuginfo_non_lto_args(self):
         if ('swift_debuginfo_non_lto_args' not in self.args
                 or self.args.swift_debuginfo_non_lto_args is None):
diff --git a/utils/swift_build_support/tests/products/test_swift.py b/utils/swift_build_support/tests/products/test_swift.py
index 9cb4e70a85c..5d4c9def758 100644
--- a/utils/swift_build_support/tests/products/test_swift.py
+++ b/utils/swift_build_support/tests/products/test_swift.py
@@ -74,7 +74,12 @@ class SwiftTestCase(unittest.TestCase):
             build_swift_private_stdlib=True,
             swift_tools_ld64_lto_codegen_only_for_supporting_targets=False,
             build_stdlib_docs=False,
-            enable_new_runtime_build=False)
+            enable_new_runtime_build=False,
+            darwin_test_deployment_version_osx="10.9",
+            darwin_test_deployment_version_ios="15.0",
+            darwin_test_deployment_version_tvos="14.0",
+            darwin_test_deployment_version_watchos="6.0",
+            darwin_test_deployment_version_xros="1.0")
 
         # Setup shell
         shell.dry_run = True
@@ -126,6 +131,11 @@ class SwiftTestCase(unittest.TestCase):
             '-USWIFT_DEBUGINFO_NON_LTO_ARGS',
             '-DSWIFT_STDLIB_BUILD_SYMBOL_GRAPHS:BOOL=FALSE',
             '-DSWIFT_ENABLE_NEW_RUNTIME_BUILD:BOOL=FALSE',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_OSX:STRING=10.9',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_IOS:STRING=15.0',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_TVOS:STRING=14.0',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_WATCHOS:STRING=6.0',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_XROS:STRING=1.0',
             '-DHELLO=YES',
         ]
         self.assertEqual(set(swift.cmake_options), set(expected))
@@ -163,6 +173,11 @@ class SwiftTestCase(unittest.TestCase):
             '-USWIFT_DEBUGINFO_NON_LTO_ARGS',
             '-DSWIFT_STDLIB_BUILD_SYMBOL_GRAPHS:BOOL=FALSE',
             '-DSWIFT_ENABLE_NEW_RUNTIME_BUILD:BOOL=FALSE',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_OSX:STRING=10.9',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_IOS:STRING=15.0',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_TVOS:STRING=14.0',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_WATCHOS:STRING=6.0',
+            '-DSWIFT_DARWIN_TEST_DEPLOYMENT_VERSION_XROS:STRING=1.0',
             '-DHELLO=YES',
         ]
         self.assertEqual(set(swift.cmake_options), set(flags_set))