diff --git a/CMakeLists.txt b/CMakeLists.txt
index 42d37d7d444..55b307050c9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -236,8 +236,8 @@ endif()
 if(gRPC_BACKWARDS_COMPATIBILITY_MODE)
   add_definitions(-DGPR_BACKWARDS_COMPATIBILITY_MODE)
   if(_gRPC_PLATFORM_MAC)
-    # some C++11 constructs not supported before OS X 10.9
-    set(CMAKE_OSX_DEPLOYMENT_TARGET 10.9)
+    # some C++11 constructs not supported before OS X 10.10
+    set(CMAKE_OSX_DEPLOYMENT_TARGET 10.10)
   endif()
 endif()
 
diff --git a/examples/objective-c/BUILD b/examples/objective-c/BUILD
index 6f2331028c0..988a317c1e4 100644
--- a/examples/objective-c/BUILD
+++ b/examples/objective-c/BUILD
@@ -56,7 +56,7 @@ ios_application(
         "ipad",
     ],
     infoplists = ["helloworld/HelloWorld/Info.plist"],
-    minimum_os_version = "8.0",
+    minimum_os_version = "9.0",
     tags = ["manual"],
     deps = [":HelloWorld-lib"],
 )
@@ -113,7 +113,7 @@ ios_application(
         "ipad",
     ],
     infoplists = ["route_guide/Misc/Info.plist"],
-    minimum_os_version = "8.0",
+    minimum_os_version = "9.0",
     tags = ["manual"],
     deps = [":RouteGuideClient-lib"],
 )
diff --git a/examples/objective-c/auth_sample/AuthTestService.podspec b/examples/objective-c/auth_sample/AuthTestService.podspec
index d603c2e442b..4fa7641e361 100644
--- a/examples/objective-c/auth_sample/AuthTestService.podspec
+++ b/examples/objective-c/auth_sample/AuthTestService.podspec
@@ -7,8 +7,8 @@ Pod::Spec.new do |s|
   s.summary = "AuthTestService example"
   s.source = { :git => 'https://github.com/grpc/grpc.git' }
 
-  s.ios.deployment_target = "7.1"
-  s.osx.deployment_target = "10.9"
+  s.ios.deployment_target = "9.0"
+  s.osx.deployment_target = "10.10"
 
   # Base directory where the .proto files are.
   src = "../../protos"
diff --git a/examples/objective-c/helloworld/HelloWorld.podspec b/examples/objective-c/helloworld/HelloWorld.podspec
index fc671ef4da2..523cca819d3 100644
--- a/examples/objective-c/helloworld/HelloWorld.podspec
+++ b/examples/objective-c/helloworld/HelloWorld.podspec
@@ -7,8 +7,8 @@ Pod::Spec.new do |s|
   s.summary = "HelloWorld example"
   s.source = { :git => 'https://github.com/grpc/grpc.git' }
 
-  s.ios.deployment_target = "7.1"
-  s.osx.deployment_target = "10.9"
+  s.ios.deployment_target = "9.0"
+  s.osx.deployment_target = "10.10"
 
   # Base directory where the .proto files are.
   src = "../../protos"
diff --git a/examples/objective-c/helloworld/Podfile b/examples/objective-c/helloworld/Podfile
index 0c3feaa47eb..6dbfe819794 100644
--- a/examples/objective-c/helloworld/Podfile
+++ b/examples/objective-c/helloworld/Podfile
@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 
diff --git a/examples/objective-c/helloworld_macos/HelloWorld.podspec b/examples/objective-c/helloworld_macos/HelloWorld.podspec
index fc671ef4da2..523cca819d3 100644
--- a/examples/objective-c/helloworld_macos/HelloWorld.podspec
+++ b/examples/objective-c/helloworld_macos/HelloWorld.podspec
@@ -7,8 +7,8 @@ Pod::Spec.new do |s|
   s.summary = "HelloWorld example"
   s.source = { :git => 'https://github.com/grpc/grpc.git' }
 
-  s.ios.deployment_target = "7.1"
-  s.osx.deployment_target = "10.9"
+  s.ios.deployment_target = "9.0"
+  s.osx.deployment_target = "10.10"
 
   # Base directory where the .proto files are.
   src = "../../protos"
diff --git a/examples/objective-c/helloworld_macos/Podfile b/examples/objective-c/helloworld_macos/Podfile
index bf1488cba64..943b87d6cd8 100644
--- a/examples/objective-c/helloworld_macos/Podfile
+++ b/examples/objective-c/helloworld_macos/Podfile
@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :macos, '10.9'
+platform :macos, '10.10'
 
 install! 'cocoapods', :deterministic_uuids => false
 
diff --git a/examples/objective-c/route_guide/Podfile b/examples/objective-c/route_guide/Podfile
index b77eb1b11d1..1cc4e468e29 100644
--- a/examples/objective-c/route_guide/Podfile
+++ b/examples/objective-c/route_guide/Podfile
@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 
diff --git a/examples/objective-c/route_guide/RouteGuide.podspec b/examples/objective-c/route_guide/RouteGuide.podspec
index 59639599043..e50e82429a2 100644
--- a/examples/objective-c/route_guide/RouteGuide.podspec
+++ b/examples/objective-c/route_guide/RouteGuide.podspec
@@ -7,8 +7,8 @@ Pod::Spec.new do |s|
   s.summary = "RouteGuide example"
   s.source = { :git => 'https://github.com/grpc/grpc.git' }
 
-  s.ios.deployment_target = "7.1"
-  s.osx.deployment_target = "10.9"
+  s.ios.deployment_target = "9.0"
+  s.osx.deployment_target = "10.10"
 
   # Base directory where the .proto files are.
   src = "../../protos"
diff --git a/gRPC-C++.podspec b/gRPC-C++.podspec
index 87c24675daa..7b324d75ee8 100644
--- a/gRPC-C++.podspec
+++ b/gRPC-C++.podspec
@@ -34,8 +34,8 @@ Pod::Spec.new do |s|
     :tag => "v#{version}",
   }
 
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
 
   s.requires_arc = false
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 41f8772e64e..997e5a658c9 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -38,8 +38,8 @@ Pod::Spec.new do |s|
   # which was released in Cocoapods v1.2.0.
   s.cocoapods_version = '>= 1.2.0'
 
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '4.0'
 
diff --git a/gRPC-ProtoRPC.podspec b/gRPC-ProtoRPC.podspec
index df4f6eb8b39..bb70623d92f 100644
--- a/gRPC-ProtoRPC.podspec
+++ b/gRPC-ProtoRPC.podspec
@@ -33,8 +33,8 @@ Pod::Spec.new do |s|
     :tag => "v#{version}",
   }
 
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '4.0'
 
diff --git a/gRPC-RxLibrary.podspec b/gRPC-RxLibrary.podspec
index 39783d5bddb..baa303244cf 100644
--- a/gRPC-RxLibrary.podspec
+++ b/gRPC-RxLibrary.podspec
@@ -33,8 +33,8 @@ Pod::Spec.new do |s|
     :tag => "v#{version}",
   }
 
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '4.0'
 
diff --git a/gRPC.podspec b/gRPC.podspec
index ce15162558c..74bcacfb4b0 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -44,8 +44,8 @@ Pod::Spec.new do |s|
     'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
   }
 
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '4.0'
 
@@ -70,8 +70,8 @@ Pod::Spec.new do |s|
                       "src/objective-c/GRPCClient/GRPCTypes.m"
     ss.dependency "gRPC-RxLibrary/Interface", version
 
-    ss.ios.deployment_target = '7.0'
-    ss.osx.deployment_target = '10.9'
+    ss.ios.deployment_target = '9.0'
+    ss.osx.deployment_target = '10.10'
     ss.tvos.deployment_target = '10.0'
     ss.watchos.deployment_target = '4.0'
   end
@@ -105,8 +105,8 @@ Pod::Spec.new do |s|
 
     ss.dependency "#{s.name}/Interface-Legacy", version
 
-    ss.ios.deployment_target = '7.0'
-    ss.osx.deployment_target = '10.9'
+    ss.ios.deployment_target = '9.0'
+    ss.osx.deployment_target = '10.10'
     ss.tvos.deployment_target = '10.0'
     ss.watchos.deployment_target = '4.0'
   end
@@ -141,8 +141,8 @@ Pod::Spec.new do |s|
     ss.dependency 'gRPC-Core', version
     ss.dependency 'gRPC-RxLibrary', version
 
-    ss.ios.deployment_target = '7.0'
-    ss.osx.deployment_target = '10.9'
+    ss.ios.deployment_target = '9.0'
+    ss.osx.deployment_target = '10.10'
     ss.tvos.deployment_target = '10.0'
     ss.watchos.deployment_target = '4.0'
   end
@@ -157,15 +157,15 @@ Pod::Spec.new do |s|
     ss.dependency 'gRPC-Core/Cronet-Implementation', version
     ss.dependency 'CronetFramework'
 
-    ss.ios.deployment_target = '8.0'
+    ss.ios.deployment_target = '9.0'
   end
 
   # CFStream is now default. Leaving this subspec only for compatibility purpose.
   s.subspec 'CFStream' do |ss|
     ss.dependency "#{s.name}/GRPCCore", version
 
-    ss.ios.deployment_target = '7.0'
-    ss.osx.deployment_target = '10.9'
+    ss.ios.deployment_target = '9.0'
+    ss.osx.deployment_target = '10.10'
     ss.tvos.deployment_target = '10.0'
     ss.watchos.deployment_target = '4.0'
   end
@@ -176,8 +176,8 @@ Pod::Spec.new do |s|
     ss.source_files = 'src/objective-c/GRPCClient/internal_testing/*.{h,m}'
     ss.header_mappings_dir = 'src/objective-c/GRPCClient'
 
-    ss.ios.deployment_target = '7.0'
-    ss.osx.deployment_target = '10.9'
+    ss.ios.deployment_target = '9.0'
+    ss.osx.deployment_target = '10.10'
     ss.tvos.deployment_target = '10.0'
     ss.watchos.deployment_target = '4.0'
   end
diff --git a/include/grpc/impl/codegen/port_platform.h b/include/grpc/impl/codegen/port_platform.h
index 33f8a1a59d6..11a6f35dd96 100644
--- a/include/grpc/impl/codegen/port_platform.h
+++ b/include/grpc/impl/codegen/port_platform.h
@@ -208,23 +208,6 @@
 #define GRPC_ARES 0
 #else /* TARGET_OS_IPHONE */
 #define GPR_PLATFORM_STRING "osx"
-#ifdef __MAC_OS_X_VERSION_MIN_REQUIRED
-#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_7
-#define GPR_CPU_IPHONE 1
-#define GPR_PTHREAD_TLS 1
-#else /* __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_7 */
-#define GPR_CPU_POSIX 1
-/* TODO(vjpai): there is a reported issue in bazel build for Mac where __thread
-   in a header is currently not working (bazelbuild/bazel#4341). Remove
-   the following conditional and use GPR_GCC_TLS when that is fixed */
-#ifndef GRPC_BAZEL_BUILD
-#define GPR_GCC_TLS 1
-#else /* GRPC_BAZEL_BUILD */
-#define GPR_PTHREAD_TLS 1
-#endif /* GRPC_BAZEL_BUILD */
-#define GPR_APPLE_PTHREAD_NAME 1
-#endif
-#else /* __MAC_OS_X_VERSION_MIN_REQUIRED */
 #define GPR_CPU_POSIX 1
 /* TODO(vjpai): Remove the following conditional and use only GPR_GCC_TLS
    when bazelbuild/bazel#4341 is fixed */
@@ -233,7 +216,6 @@
 #else /* GRPC_BAZEL_BUILD */
 #define GPR_PTHREAD_TLS 1
 #endif /* GRPC_BAZEL_BUILD */
-#endif
 #define GPR_POSIX_CRASH_HANDLER 1
 #endif
 #define GPR_APPLE 1
diff --git a/src/cpp/Protobuf-C++.podspec b/src/cpp/Protobuf-C++.podspec
index 82dc8c6002d..299e535942e 100644
--- a/src/cpp/Protobuf-C++.podspec
+++ b/src/cpp/Protobuf-C++.podspec
@@ -25,8 +25,8 @@ Pod::Spec.new do |s|
 
   s.header_mappings_dir = 'src'
 
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '9.0'
   s.watchos.deployment_target = '2.0'
 
diff --git a/src/csharp/experimental/build_native_ext_for_ios.sh b/src/csharp/experimental/build_native_ext_for_ios.sh
index 130f4c51e96..f296142cbe4 100755
--- a/src/csharp/experimental/build_native_ext_for_ios.sh
+++ b/src/csharp/experimental/build_native_ext_for_ios.sh
@@ -28,8 +28,8 @@ function build {
     PATH_CC="$(xcrun --sdk $SDK --find clang)"
     PATH_CXX="$(xcrun --sdk $SDK --find clang++)"
 
-    CPPFLAGS="-O2 -Wframe-larger-than=16384 -arch $ARCH -isysroot $(xcrun --sdk $SDK --show-sdk-path) -mios-version-min=6.0 -DPB_NO_PACKED_STRUCTS=1"
-    LDFLAGS="-arch $ARCH -isysroot $(xcrun --sdk $SDK --show-sdk-path) -Wl,ios_version_min=6.0"
+    CPPFLAGS="-O2 -Wframe-larger-than=16384 -arch $ARCH -isysroot $(xcrun --sdk $SDK --show-sdk-path) -mios-version-min=9.0 -DPB_NO_PACKED_STRUCTS=1"
+    LDFLAGS="-arch $ARCH -isysroot $(xcrun --sdk $SDK --show-sdk-path) -Wl,ios_version_min=9.0"
 
     # TODO(jtattermusch): revisit the build arguments
     make -j4 static_csharp \
diff --git a/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec b/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec
index 411885a14d7..19214758c91 100644
--- a/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec
+++ b/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec
@@ -102,8 +102,8 @@ Pod::Spec.new do |s|
   # Restrict the protoc version to the one supported by this plugin.
   s.dependency '!ProtoCompiler', '3.13.0'
   # For the Protobuf dependency not to complain:
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '2.0'
 
diff --git a/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec b/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec
index 33d445858c0..f3171a83d68 100644
--- a/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec
+++ b/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec
@@ -104,8 +104,8 @@ Pod::Spec.new do |s|
   # Restrict the protoc version to the one supported by this plugin.
   s.dependency '!ProtoCompiler', '3.13.0'
   # For the Protobuf dependency not to complain:
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
 
   # watchOS is disabled due to #20258.
diff --git a/src/objective-c/!ProtoCompiler.podspec b/src/objective-c/!ProtoCompiler.podspec
index 508586b5a73..20aa37f3dff 100644
--- a/src/objective-c/!ProtoCompiler.podspec
+++ b/src/objective-c/!ProtoCompiler.podspec
@@ -110,8 +110,8 @@ Pod::Spec.new do |s|
   # Restrict the protobuf runtime version to the one supported by this version of protoc.
   s.dependency 'Protobuf', '~> 3.0'
   # For the Protobuf dependency not to complain:
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '4.0'
 
diff --git a/src/objective-c/BoringSSL-GRPC.podspec b/src/objective-c/BoringSSL-GRPC.podspec
index ae29922bdfa..c602aae011b 100644
--- a/src/objective-c/BoringSSL-GRPC.podspec
+++ b/src/objective-c/BoringSSL-GRPC.podspec
@@ -79,8 +79,8 @@ Pod::Spec.new do |s|
     :commit => "88aeb757f1a415c71fb4cbf5af936ecae4bc8179",
   }
 
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.7'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '4.0'
 
diff --git a/src/objective-c/CronetFramework.podspec b/src/objective-c/CronetFramework.podspec
index 66db3948212..f6b70d9a3fa 100644
--- a/src/objective-c/CronetFramework.podspec
+++ b/src/objective-c/CronetFramework.podspec
@@ -69,7 +69,7 @@ Pod::Spec.new do |s|
   }
   s.vendored_framework = "Cronet.framework"
   s.author             = "The Chromium Authors"
-  s.ios.deployment_target = "8.0"
+  s.ios.deployment_target = "9.0"
   s.source       = { :http => "https://storage.googleapis.com/grpc-precompiled-binaries/cronet/Cronet.framework-v#{v}.zip"}
   s.preserve_paths = "Cronet.framework"
   s.public_header_files = "Cronet.framework/Headers/**/*{.h}"
diff --git a/src/objective-c/README.md b/src/objective-c/README.md
index 83775f86e17..2f5e330bdb0 100644
--- a/src/objective-c/README.md
+++ b/src/objective-c/README.md
@@ -1,7 +1,7 @@
 [![Cocoapods](https://img.shields.io/cocoapods/v/gRPC.svg)](https://cocoapods.org/pods/gRPC)
 # gRPC for Objective-C
 gRPC Objective C library provides Objective C API for users to make gRPC calls on iOS or OS X
-platforms. Currently, the minimum supported iOS version is 7.0 and OS X version is 10.9 (Mavericks).
+platforms. Currently, the minimum supported iOS version is 9.0 and OS X version is 10.10 (Yosemite).
 
 While gRPC doesn't require the use of an IDL to describe the API of services, using one simplifies
 usage and adds some interoperability guarantees. Here we use [Protocol Buffers][], and provide a
@@ -43,8 +43,8 @@ Pod::Spec.new do |s|
   s.summary = '...'
   s.source = { :git => 'https://github.com/...' }
 
-  s.ios.deployment_target = '7.1'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
 
   # Base directory where the .proto files are.
   src = '.'
diff --git a/src/objective-c/examples/BUILD b/src/objective-c/examples/BUILD
index 9f5003ed2d5..73f0cb7a88d 100644
--- a/src/objective-c/examples/BUILD
+++ b/src/objective-c/examples/BUILD
@@ -77,7 +77,7 @@ ios_application(
         "ipad",
     ],
     infoplists = ["Sample/Sample/Info.plist"],
-    minimum_os_version = "8.0",
+    minimum_os_version = "9.0",
     visibility = ["//visibility:public"],
     deps = ["Sample-lib"],
 )
diff --git a/src/objective-c/examples/InterceptorSample/Podfile b/src/objective-c/examples/InterceptorSample/Podfile
index 0252451eff9..e61aacd5c8d 100644
--- a/src/objective-c/examples/InterceptorSample/Podfile
+++ b/src/objective-c/examples/InterceptorSample/Podfile
@@ -1,4 +1,4 @@
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 
diff --git a/src/objective-c/examples/RemoteTestClient/RemoteTest.podspec b/src/objective-c/examples/RemoteTestClient/RemoteTest.podspec
index ca45fd063bd..3c2b09ad5bd 100644
--- a/src/objective-c/examples/RemoteTestClient/RemoteTest.podspec
+++ b/src/objective-c/examples/RemoteTestClient/RemoteTest.podspec
@@ -7,8 +7,8 @@ Pod::Spec.new do |s|
   s.summary = 'RemoteTest example'
   s.source = { :git => 'https://github.com/grpc/grpc.git' }
 
-  s.ios.deployment_target = '7.1'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '4.0'
 
diff --git a/src/objective-c/examples/Sample/Podfile b/src/objective-c/examples/Sample/Podfile
index e7ee700cb17..c1ae381c9c2 100644
--- a/src/objective-c/examples/Sample/Podfile
+++ b/src/objective-c/examples/Sample/Podfile
@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 
diff --git a/src/objective-c/examples/SwiftSample/Podfile b/src/objective-c/examples/SwiftSample/Podfile
index 8214371bc59..c5c49cfee23 100644
--- a/src/objective-c/examples/SwiftSample/Podfile
+++ b/src/objective-c/examples/SwiftSample/Podfile
@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 
diff --git a/src/objective-c/examples/watchOS-sample/Podfile b/src/objective-c/examples/watchOS-sample/Podfile
index 59d30ab86c0..30dffad4d41 100644
--- a/src/objective-c/examples/watchOS-sample/Podfile
+++ b/src/objective-c/examples/watchOS-sample/Podfile
@@ -16,7 +16,7 @@ def grpc_deps
 end
 
 target 'watchOS-sample' do
-platform :ios, '8.0'
+platform :ios, '9.0'
   grpc_deps
 end
 
diff --git a/src/objective-c/manual_tests/Podfile b/src/objective-c/manual_tests/Podfile
index 919e649be71..ef07d416d1d 100644
--- a/src/objective-c/manual_tests/Podfile
+++ b/src/objective-c/manual_tests/Podfile
@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 
diff --git a/src/objective-c/tests/BUILD b/src/objective-c/tests/BUILD
index 888aab6714b..f029984babb 100644
--- a/src/objective-c/tests/BUILD
+++ b/src/objective-c/tests/BUILD
@@ -174,7 +174,7 @@ grpc_objc_testing_library(
 
 ios_unit_test(
     name = "UnitTests",
-    minimum_os_version = "8.0",
+    minimum_os_version = "9.0",
     test_host = ":ios-host",
     deps = [
         ":APIv2Tests-lib",
@@ -188,7 +188,7 @@ ios_unit_test(
 
 ios_unit_test(
     name = "InteropTests",
-    minimum_os_version = "8.0",
+    minimum_os_version = "9.0",
     test_host = ":ios-host",
     deps = [
         ":InteropTestsLocalCleartext-lib",
@@ -199,7 +199,7 @@ ios_unit_test(
 
 macos_unit_test(
     name = "MacTests",
-    minimum_os_version = "10.9",
+    minimum_os_version = "10.10",
     deps = [
         ":APIv2Tests-lib",
         ":InteropTestsLocalCleartext-lib",
diff --git a/src/objective-c/tests/Connectivity/Podfile b/src/objective-c/tests/Connectivity/Podfile
index 2c2344334c9..6da2d6e5ebb 100644
--- a/src/objective-c/tests/Connectivity/Podfile
+++ b/src/objective-c/tests/Connectivity/Podfile
@@ -1,5 +1,5 @@
 install! 'cocoapods', :deterministic_uuids => false
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 # Location of gRPC's repo root relative to this file.
 GRPC_LOCAL_SRC = '../../../..'
diff --git a/src/objective-c/tests/Podfile b/src/objective-c/tests/Podfile
index 664ff94526f..bf399c4777b 100644
--- a/src/objective-c/tests/Podfile
+++ b/src/objective-c/tests/Podfile
@@ -35,13 +35,13 @@ end
   InteropTests
 ).each do |target_name|
   target target_name do
-    platform :ios, '8.0'
+    platform :ios, '9.0'
     grpc_deps
   end
 end
 
 target 'CronetTests' do
-  platform :ios, '8.0'
+  platform :ios, '9.0'
   grpc_deps
 
   pod 'gRPC/GRPCCoreCronet',           :path => GRPC_LOCAL_SRC
@@ -50,7 +50,7 @@ target 'CronetTests' do
 end
 
 target 'PerfTests' do
-  platform :ios, '8.0'
+  platform :ios, '9.0'
   grpc_deps
 
   pod 'gRPC/GRPCCoreCronet',           :path => GRPC_LOCAL_SRC
diff --git a/src/objective-c/tests/RemoteTestClient/RemoteTest.podspec b/src/objective-c/tests/RemoteTestClient/RemoteTest.podspec
index 4a35328f73f..be0ed3e2673 100644
--- a/src/objective-c/tests/RemoteTestClient/RemoteTest.podspec
+++ b/src/objective-c/tests/RemoteTestClient/RemoteTest.podspec
@@ -7,8 +7,8 @@ Pod::Spec.new do |s|
   s.summary = "RemoteTest example"
   s.source = { :git => 'https://github.com/grpc/grpc.git' }
 
-  s.ios.deployment_target = '7.1'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '10.0'
   s.watchos.deployment_target = '4.0'
 
diff --git a/templates/CMakeLists.txt.template b/templates/CMakeLists.txt.template
index f7db0fd2d0c..760c348ba4c 100644
--- a/templates/CMakeLists.txt.template
+++ b/templates/CMakeLists.txt.template
@@ -300,8 +300,8 @@
   if(gRPC_BACKWARDS_COMPATIBILITY_MODE)
     add_definitions(-DGPR_BACKWARDS_COMPATIBILITY_MODE)
     if(_gRPC_PLATFORM_MAC)
-      # some C++11 constructs not supported before OS X 10.9
-      set(CMAKE_OSX_DEPLOYMENT_TARGET 10.9)
+      # some C++11 constructs not supported before OS X 10.10
+      set(CMAKE_OSX_DEPLOYMENT_TARGET 10.10)
     endif()
   endif()
 
diff --git a/templates/gRPC-C++.podspec.template b/templates/gRPC-C++.podspec.template
index b94e557a830..c5d11c53d82 100644
--- a/templates/gRPC-C++.podspec.template
+++ b/templates/gRPC-C++.podspec.template
@@ -116,8 +116,8 @@
       :tag => "v#{version}",
     }
 
-    s.ios.deployment_target = '7.0'
-    s.osx.deployment_target = '10.9'
+    s.ios.deployment_target = '9.0'
+    s.osx.deployment_target = '10.10'
     s.tvos.deployment_target = '10.0'
 
     s.requires_arc = false
diff --git a/templates/gRPC-Core.podspec.template b/templates/gRPC-Core.podspec.template
index 7278c9e8e30..c1d53a702cc 100644
--- a/templates/gRPC-Core.podspec.template
+++ b/templates/gRPC-Core.podspec.template
@@ -115,8 +115,8 @@
     # which was released in Cocoapods v1.2.0.
     s.cocoapods_version = '>= 1.2.0'
 
-    s.ios.deployment_target = '7.0'
-    s.osx.deployment_target = '10.9'
+    s.ios.deployment_target = '9.0'
+    s.osx.deployment_target = '10.10'
     s.tvos.deployment_target = '10.0'
     s.watchos.deployment_target = '4.0'
 
diff --git a/templates/gRPC-ProtoRPC.podspec.template b/templates/gRPC-ProtoRPC.podspec.template
index e94f149ee4a..ee7eb99e503 100644
--- a/templates/gRPC-ProtoRPC.podspec.template
+++ b/templates/gRPC-ProtoRPC.podspec.template
@@ -35,8 +35,8 @@
       :tag => "v#{version}",
     }
 
-    s.ios.deployment_target = '7.0'
-    s.osx.deployment_target = '10.9'
+    s.ios.deployment_target = '9.0'
+    s.osx.deployment_target = '10.10'
     s.tvos.deployment_target = '10.0'
     s.watchos.deployment_target = '4.0'
 
diff --git a/templates/gRPC-RxLibrary.podspec.template b/templates/gRPC-RxLibrary.podspec.template
index 772265dadda..ac51486a334 100644
--- a/templates/gRPC-RxLibrary.podspec.template
+++ b/templates/gRPC-RxLibrary.podspec.template
@@ -35,8 +35,8 @@
       :tag => "v#{version}",
     }
 
-    s.ios.deployment_target = '7.0'
-    s.osx.deployment_target = '10.9'
+    s.ios.deployment_target = '9.0'
+    s.osx.deployment_target = '10.10'
     s.tvos.deployment_target = '10.0'
     s.watchos.deployment_target = '4.0'
 
diff --git a/templates/gRPC.podspec.template b/templates/gRPC.podspec.template
index 29dd7244692..068dd3d725f 100644
--- a/templates/gRPC.podspec.template
+++ b/templates/gRPC.podspec.template
@@ -46,8 +46,8 @@
       'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
     }
 
-    s.ios.deployment_target = '7.0'
-    s.osx.deployment_target = '10.9'
+    s.ios.deployment_target = '9.0'
+    s.osx.deployment_target = '10.10'
     s.tvos.deployment_target = '10.0'
     s.watchos.deployment_target = '4.0'
 
@@ -72,8 +72,8 @@
                         "src/objective-c/GRPCClient/GRPCTypes.m"
       ss.dependency "gRPC-RxLibrary/Interface", version
 
-      ss.ios.deployment_target = '7.0'
-      ss.osx.deployment_target = '10.9'
+      ss.ios.deployment_target = '9.0'
+      ss.osx.deployment_target = '10.10'
       ss.tvos.deployment_target = '10.0'
       ss.watchos.deployment_target = '4.0'
     end
@@ -107,8 +107,8 @@
 
       ss.dependency "#{s.name}/Interface-Legacy", version
 
-      ss.ios.deployment_target = '7.0'
-      ss.osx.deployment_target = '10.9'
+      ss.ios.deployment_target = '9.0'
+      ss.osx.deployment_target = '10.10'
       ss.tvos.deployment_target = '10.0'
       ss.watchos.deployment_target = '4.0'
     end
@@ -143,8 +143,8 @@
       ss.dependency 'gRPC-Core', version
       ss.dependency 'gRPC-RxLibrary', version
 
-      ss.ios.deployment_target = '7.0'
-      ss.osx.deployment_target = '10.9'
+      ss.ios.deployment_target = '9.0'
+      ss.osx.deployment_target = '10.10'
       ss.tvos.deployment_target = '10.0'
       ss.watchos.deployment_target = '4.0'
     end
@@ -159,15 +159,15 @@
       ss.dependency 'gRPC-Core/Cronet-Implementation', version
       ss.dependency 'CronetFramework'
 
-      ss.ios.deployment_target = '8.0'
+      ss.ios.deployment_target = '9.0'
     end
 
     # CFStream is now default. Leaving this subspec only for compatibility purpose.
     s.subspec 'CFStream' do |ss|
       ss.dependency "#{s.name}/GRPCCore", version
 
-      ss.ios.deployment_target = '7.0'
-      ss.osx.deployment_target = '10.9'
+      ss.ios.deployment_target = '9.0'
+      ss.osx.deployment_target = '10.10'
       ss.tvos.deployment_target = '10.0'
       ss.watchos.deployment_target = '4.0'
     end
@@ -178,8 +178,8 @@
       ss.source_files = 'src/objective-c/GRPCClient/internal_testing/*.{h,m}'
       ss.header_mappings_dir = 'src/objective-c/GRPCClient'
 
-      ss.ios.deployment_target = '7.0'
-      ss.osx.deployment_target = '10.9'
+      ss.ios.deployment_target = '9.0'
+      ss.osx.deployment_target = '10.10'
       ss.tvos.deployment_target = '10.0'
       ss.watchos.deployment_target = '4.0'
     end
diff --git a/templates/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec.template b/templates/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec.template
index 88dab8db521..626e3c82b3a 100644
--- a/templates/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec.template
+++ b/templates/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec.template
@@ -104,8 +104,8 @@
     # Restrict the protoc version to the one supported by this plugin.
     s.dependency '!ProtoCompiler', '3.13.0'
     # For the Protobuf dependency not to complain:
-    s.ios.deployment_target = '7.0'
-    s.osx.deployment_target = '10.9'
+    s.ios.deployment_target = '9.0'
+    s.osx.deployment_target = '10.10'
     s.tvos.deployment_target = '10.0'
     s.watchos.deployment_target = '2.0'
 
diff --git a/templates/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec.template b/templates/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec.template
index e66faf554a7..fec89943e5c 100644
--- a/templates/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec.template
+++ b/templates/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec.template
@@ -106,8 +106,8 @@
     # Restrict the protoc version to the one supported by this plugin.
     s.dependency '!ProtoCompiler', '3.13.0'
     # For the Protobuf dependency not to complain:
-    s.ios.deployment_target = '7.0'
-    s.osx.deployment_target = '10.9'
+    s.ios.deployment_target = '9.0'
+    s.osx.deployment_target = '10.10'
     s.tvos.deployment_target = '10.0'
 
     # watchOS is disabled due to #20258.
diff --git a/templates/src/objective-c/BoringSSL-GRPC.podspec.template b/templates/src/objective-c/BoringSSL-GRPC.podspec.template
index 11a9c66d0bc..b70522f9099 100644
--- a/templates/src/objective-c/BoringSSL-GRPC.podspec.template
+++ b/templates/src/objective-c/BoringSSL-GRPC.podspec.template
@@ -109,8 +109,8 @@
       :commit => "${boringssl_commit}",
     }
 
-    s.ios.deployment_target = '7.0'
-    s.osx.deployment_target = '10.7'
+    s.ios.deployment_target = '9.0'
+    s.osx.deployment_target = '10.10'
     s.tvos.deployment_target = '10.0'
     s.watchos.deployment_target = '4.0'
 
diff --git a/test/core/iomgr/ios/CFStreamTests/Podfile b/test/core/iomgr/ios/CFStreamTests/Podfile
index 309222b5730..69e9bf459b5 100644
--- a/test/core/iomgr/ios/CFStreamTests/Podfile
+++ b/test/core/iomgr/ios/CFStreamTests/Podfile
@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 
diff --git a/test/cpp/cocoapods/Podfile b/test/cpp/cocoapods/Podfile
index 7300a6e5775..6daf089e988 100644
--- a/test/cpp/cocoapods/Podfile
+++ b/test/cpp/cocoapods/Podfile
@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 
diff --git a/test/cpp/ios/Podfile b/test/cpp/ios/Podfile
index 0806fa24a5a..2ff45597a21 100644
--- a/test/cpp/ios/Podfile
+++ b/test/cpp/ios/Podfile
@@ -7,7 +7,7 @@ GRPC_LOCAL_SRC = '../../..'
 
 
 target 'CronetTests' do
-  platform :ios, '8.0'
+  platform :ios, '9.0'
   pod 'Protobuf', :path => "#{GRPC_LOCAL_SRC}/third_party/protobuf", :inhibit_warnings => true
 
   pod '!ProtoCompiler',            :path => "#{GRPC_LOCAL_SRC}/src/objective-c"
diff --git a/test/cpp/ios/RemoteTestClientCpp/RemoteTestCpp.podspec b/test/cpp/ios/RemoteTestClientCpp/RemoteTestCpp.podspec
index debe2943208..e113703bcc9 100644
--- a/test/cpp/ios/RemoteTestClientCpp/RemoteTestCpp.podspec
+++ b/test/cpp/ios/RemoteTestClientCpp/RemoteTestCpp.podspec
@@ -7,8 +7,8 @@ Pod::Spec.new do |s|
   s.summary = "RemoteTest example"
   s.source = { :git => 'https://github.com/grpc/grpc.git' }
 
-  s.ios.deployment_target = '7.1'
-  s.osx.deployment_target = '10.9'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.10'
 
   # Run protoc with the C++ and gRPC plugins to generate protocol messages and gRPC clients.
   s.dependency "!ProtoCompiler-gRPCCppPlugin"
diff --git a/tools/distrib/python/grpcio_tools/setup.py b/tools/distrib/python/grpcio_tools/setup.py
index f216eeb2cf2..1984a1ca294 100644
--- a/tools/distrib/python/grpcio_tools/setup.py
+++ b/tools/distrib/python/grpcio_tools/setup.py
@@ -155,10 +155,10 @@ def check_linker_need_libatomic():
 if 'darwin' in sys.platform and PY3:
     mac_target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
     if mac_target and (pkg_resources.parse_version(mac_target) <
-                       pkg_resources.parse_version('10.9.0')):
-        os.environ['MACOSX_DEPLOYMENT_TARGET'] = '10.9'
+                       pkg_resources.parse_version('10.10.0')):
+        os.environ['MACOSX_DEPLOYMENT_TARGET'] = '10.10'
         os.environ['_PYTHON_HOST_PLATFORM'] = re.sub(
-            r'macosx-[0-9]+\.[0-9]+-(.+)', r'macosx-10.9-\1',
+            r'macosx-[0-9]+\.[0-9]+-(.+)', r'macosx-10.10-\1',
             util.get_platform())