diff --git a/test/Concurrency/Runtime/async_parameter_pack.swift b/test/Concurrency/Runtime/async_parameter_pack.swift
index bc6a82776178a..639318e5c66a6 100644
--- a/test/Concurrency/Runtime/async_parameter_pack.swift
+++ b/test/Concurrency/Runtime/async_parameter_pack.swift
@@ -1,6 +1,7 @@
 // RUN: %target-run-simple-swift( -target %target-swift-5.9-abi-triple)
 // REQUIRES: executable_test
 // REQUIRES: concurrency
+// UNSUPPORTED: back_deployment_runtime || use_os_stdlib
 
 protocol P {
   associatedtype A
diff --git a/test/IRGen/noncopyable_metadata_requests.swift b/test/IRGen/noncopyable_metadata_requests.swift
index d0981d9be0c3c..4c1335a9d5ea4 100644
--- a/test/IRGen/noncopyable_metadata_requests.swift
+++ b/test/IRGen/noncopyable_metadata_requests.swift
@@ -15,6 +15,7 @@
 
 // REQUIRES: OS=macosx
 // REQUIRES: executable_test
+// UNSUPPORTED: back_deployment_runtime || use_os_stdlib
 
 
 // This type's generic parameter is noncopyable, so older runtimes can't
diff --git a/test/Interop/Cxx/class/for-each-field.swift b/test/Interop/Cxx/class/for-each-field.swift
index 3138db360df26..fbe885b76d8d2 100644
--- a/test/Interop/Cxx/class/for-each-field.swift
+++ b/test/Interop/Cxx/class/for-each-field.swift
@@ -2,6 +2,7 @@
 
 // REQUIRES: executable_test
 // REQUIRES: reflection
+// UNSUPPORTED: back_deployment_runtime || use_os_stdlib
 
 @_spi(Reflection) import Swift
 import SimpleStructs
diff --git a/test/Interop/Cxx/stdlib/use-swift-concurrency.swift b/test/Interop/Cxx/stdlib/use-swift-concurrency.swift
index 35c739342b319..711ff39b2debb 100644
--- a/test/Interop/Cxx/stdlib/use-swift-concurrency.swift
+++ b/test/Interop/Cxx/stdlib/use-swift-concurrency.swift
@@ -4,6 +4,7 @@
 // REQUIRES: concurrency
 // REQUIRES: libdispatch
 // REQUIRES: concurrency_runtime
+// UNSUPPORTED: back_deployment_runtime || use_os_stdlib
 
 import StdlibUnittest
 
diff --git a/validation-test/Concurrency/rdar107275872.swift b/validation-test/Concurrency/rdar107275872.swift
index fd56f6970a30c..8f9a54cb8b9b7 100644
--- a/validation-test/Concurrency/rdar107275872.swift
+++ b/validation-test/Concurrency/rdar107275872.swift
@@ -7,6 +7,7 @@
 // REQUIRES: concurrency
 // REQUIRES: executable_test
 // REQUIRES: concurrency_runtime
+// UNSUPPORTED: back_deployment_runtime || use_os_stdlib
 
 // rdar://108260399
 // REQUIRES: optimized_stdlib