diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5d54d7a4bf2..42be1079067 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,7 +24,7 @@
 cmake_minimum_required(VERSION 3.5.1)
 
 set(PACKAGE_NAME      "grpc")
-set(PACKAGE_VERSION   "1.24.0-pre1")
+set(PACKAGE_VERSION   "1.24.0-pre2")
 set(PACKAGE_STRING    "${PACKAGE_NAME} ${PACKAGE_VERSION}")
 set(PACKAGE_TARNAME   "${PACKAGE_NAME}-${PACKAGE_VERSION}")
 set(PACKAGE_BUGREPORT "https://github.com/grpc/grpc/issues/")
diff --git a/Makefile b/Makefile
index 8ea288143c7..d246fb96020 100644
--- a/Makefile
+++ b/Makefile
@@ -461,8 +461,8 @@ Q = @
 endif
 
 CORE_VERSION = 8.0.0
-CPP_VERSION = 1.24.0-pre1
-CSHARP_VERSION = 2.24.0-pre1
+CPP_VERSION = 1.24.0-pre2
+CSHARP_VERSION = 2.24.0-pre2
 
 CPPFLAGS_NO_ARCH += $(addprefix -I, $(INCLUDES)) $(addprefix -D, $(DEFINES))
 CPPFLAGS += $(CPPFLAGS_NO_ARCH) $(ARCH_FLAGS)
diff --git a/build.yaml b/build.yaml
index a5296a0b689..1d541a1ff9a 100644
--- a/build.yaml
+++ b/build.yaml
@@ -15,7 +15,7 @@ settings:
   core_version: 8.0.0
   csharp_major_version: 2
   g_stands_for: ganges
-  version: 1.24.0-pre1
+  version: 1.24.0-pre2
 filegroups:
 - name: alts_tsi
   headers:
diff --git a/gRPC-C++.podspec b/gRPC-C++.podspec
index adb96d5c498..8042699a93a 100644
--- a/gRPC-C++.podspec
+++ b/gRPC-C++.podspec
@@ -23,15 +23,15 @@
 Pod::Spec.new do |s|
   s.name     = 'gRPC-C++'
   # TODO (mxyan): use version that match gRPC version when pod is stabilized
-  # version = '1.24.0-pre1'
-  version = '0.0.9-pre1'
+  # version = '1.24.0-pre2'
+  version = '0.0.9-pre2'
   s.version  = version
   s.summary  = 'gRPC C++ library'
   s.homepage = 'https://grpc.io'
   s.license  = 'Apache License, Version 2.0'
   s.authors  = { 'The gRPC contributors' => 'grpc-packages@google.com' }
 
-  grpc_version = '1.24.0-pre1'
+  grpc_version = '1.24.0-pre2'
 
   s.source = {
     :git => 'https://github.com/grpc/grpc.git',
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 425e5e31d85..608c83254cc 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -22,7 +22,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-Core'
-  version = '1.24.0-pre1'
+  version = '1.24.0-pre2'
   s.version  = version
   s.summary  = 'Core cross-platform gRPC library, written in C'
   s.homepage = 'https://grpc.io'
@@ -32,6 +32,7 @@ Pod::Spec.new do |s|
   s.source = {
     :git => 'https://github.com/grpc/grpc.git',
     :tag => "v#{version}",
+    :submodules => true,
   }
 
   # gRPC podspecs depend on fix for https://github.com/CocoaPods/CocoaPods/issues/6024,
@@ -184,10 +185,9 @@ Pod::Spec.new do |s|
     ss.header_mappings_dir = '.'
     ss.libraries = 'z'
     ss.dependency "#{s.name}/Interface", version
-    ss.dependency 'BoringSSL-GRPC', '0.0.3'
+    ss.dependency 'BoringSSL-GRPC', '0.0.4'
     ss.compiler_flags = '-DGRPC_SHADOW_BORINGSSL_SYMBOLS'
 
-    # To save you from scrolling, this is the last part of the podspec.
     ss.source_files = 'src/core/lib/gpr/alloc.h',
                       'src/core/lib/gpr/arena.h',
                       'src/core/lib/gpr/env.h',
diff --git a/gRPC-ProtoRPC.podspec b/gRPC-ProtoRPC.podspec
index fd7f9737aea..81f3b5b3a80 100644
--- a/gRPC-ProtoRPC.podspec
+++ b/gRPC-ProtoRPC.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-ProtoRPC'
-  version = '1.24.0-pre1'
+  version = '1.24.0-pre2'
   s.version  = version
   s.summary  = 'RPC library for Protocol Buffers, based on gRPC'
   s.homepage = 'https://grpc.io'
diff --git a/gRPC-RxLibrary.podspec b/gRPC-RxLibrary.podspec
index 939d59a7025..7cb7866a474 100644
--- a/gRPC-RxLibrary.podspec
+++ b/gRPC-RxLibrary.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-RxLibrary'
-  version = '1.24.0-pre1'
+  version = '1.24.0-pre2'
   s.version  = version
   s.summary  = 'Reactive Extensions library for iOS/OSX.'
   s.homepage = 'https://grpc.io'
diff --git a/gRPC.podspec b/gRPC.podspec
index 354743df059..1f508bdeae9 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -20,7 +20,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC'
-  version = '1.24.0-pre1'
+  version = '1.24.0-pre2'
   s.version  = version
   s.summary  = 'gRPC client library for iOS/OSX'
   s.homepage = 'https://grpc.io'
@@ -32,11 +32,6 @@ Pod::Spec.new do |s|
     :tag => "v#{version}",
   }
 
-  s.ios.deployment_target = '7.0'
-  s.osx.deployment_target = '10.9'
-  s.tvos.deployment_target = '10.0'
-  s.watchos.deployment_target = '4.0'
-
   name = 'GRPCClient'
   s.module_name = name
   s.header_dir = name
@@ -49,25 +44,35 @@ Pod::Spec.new do |s|
     'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
   }
 
+  s.ios.deployment_target = '7.0'
+  s.osx.deployment_target = '10.9'
+  s.tvos.deployment_target = '10.0'
+  s.watchos.deployment_target = '4.0'
+
   s.subspec 'Interface-Legacy' do |ss|
     ss.header_mappings_dir = 'src/objective-c/GRPCClient'
 
-    ss.public_header_files = "GRPCClient/GRPCCall+ChannelArg.h",
-                             "GRPCClient/GRPCCall+ChannelCredentials.h",
-                             "GRPCClient/GRPCCall+Cronet.h",
-                             "GRPCClient/GRPCCall+OAuth2.h",
-                             "GRPCClient/GRPCCall+Tests.h",
+    ss.public_header_files = "src/objective-c/GRPCClient/GRPCCall+ChannelArg.h",
+                             "src/objective-c/GRPCClient/GRPCCall+ChannelCredentials.h",
+                             "src/objective-c/GRPCClient/GRPCCall+Cronet.h",
+                             "src/objective-c/GRPCClient/GRPCCall+OAuth2.h",
+                             "src/objective-c/GRPCClient/GRPCCall+Tests.h",
                              "src/objective-c/GRPCClient/GRPCCallLegacy.h",
                              "src/objective-c/GRPCClient/GRPCTypes.h"
 
-    ss.source_files = "GRPCClient/GRPCCall+ChannelArg.h",
-                      "GRPCClient/GRPCCall+ChannelCredentials.h",
-                      "GRPCClient/GRPCCall+Cronet.h",
-                      "GRPCClient/GRPCCall+OAuth2.h",
-                      "GRPCClient/GRPCCall+Tests.h",
+    ss.source_files = "src/objective-c/GRPCClient/GRPCCall+ChannelArg.h",
+                      "src/objective-c/GRPCClient/GRPCCall+ChannelCredentials.h",
+                      "src/objective-c/GRPCClient/GRPCCall+Cronet.h",
+                      "src/objective-c/GRPCClient/GRPCCall+OAuth2.h",
+                      "src/objective-c/GRPCClient/GRPCCall+Tests.h",
                       "src/objective-c/GRPCClient/GRPCCallLegacy.h",
                       "src/objective-c/GRPCClient/GRPCTypes.h"
     ss.dependency "gRPC-RxLibrary/Interface", version
+
+    ss.ios.deployment_target = '7.0'
+    ss.osx.deployment_target = '10.9'
+    ss.tvos.deployment_target = '10.0'
+    ss.watchos.deployment_target = '4.0'
   end
 
   s.subspec 'Interface' do |ss|
@@ -98,6 +103,11 @@ Pod::Spec.new do |s|
                       'src/objective-c/GRPCClient/version.h'
 
     ss.dependency "#{s.name}/Interface-Legacy", version
+
+    ss.ios.deployment_target = '7.0'
+    ss.osx.deployment_target = '10.9'
+    ss.tvos.deployment_target = '10.0'
+    ss.watchos.deployment_target = '4.0'
   end
 
   s.subspec 'GRPCCore' do |ss|
@@ -131,6 +141,11 @@ Pod::Spec.new do |s|
     ss.dependency "#{s.name}/Interface", version
     ss.dependency 'gRPC-Core', version
     ss.dependency 'gRPC-RxLibrary', version
+
+    ss.ios.deployment_target = '7.0'
+    ss.osx.deployment_target = '10.9'
+    ss.tvos.deployment_target = '10.0'
+    ss.watchos.deployment_target = '4.0'
   end
 
   s.subspec 'GRPCCoreCronet' do |ss|
@@ -142,10 +157,17 @@ Pod::Spec.new do |s|
     ss.dependency "#{s.name}/GRPCCore", version
     ss.dependency 'gRPC-Core/Cronet-Implementation', version
     ss.dependency 'CronetFramework'
+
+    ss.ios.deployment_target = '8.0'
   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.tvos.deployment_target = '10.0'
+    ss.watchos.deployment_target = '4.0'
   end
 end
diff --git a/package.xml b/package.xml
index 26fb9df217e..249f2d27837 100644
--- a/package.xml
+++ b/package.xml
@@ -13,8 +13,8 @@
  <date>2018-01-19</date>
  <time>16:06:07</time>
  <version>
-  <release>1.24.0RC1</release>
-  <api>1.24.0RC1</api>
+  <release>1.24.0RC2</release>
+  <api>1.24.0RC2</api>
  </version>
  <stability>
   <release>beta</release>
diff --git a/src/cpp/common/version_cc.cc b/src/cpp/common/version_cc.cc
index 28043023848..eb9421183bf 100644
--- a/src/cpp/common/version_cc.cc
+++ b/src/cpp/common/version_cc.cc
@@ -22,5 +22,5 @@
 #include <grpcpp/grpcpp.h>
 
 namespace grpc {
-grpc::string Version() { return "1.24.0-pre1"; }
+grpc::string Version() { return "1.24.0-pre2"; }
 }  // namespace grpc
diff --git a/src/csharp/Grpc.Core.Api/VersionInfo.cs b/src/csharp/Grpc.Core.Api/VersionInfo.cs
index 393b67c90aa..dd04f0d8cc2 100644
--- a/src/csharp/Grpc.Core.Api/VersionInfo.cs
+++ b/src/csharp/Grpc.Core.Api/VersionInfo.cs
@@ -38,6 +38,6 @@ namespace Grpc.Core
         /// <summary>
         /// Current version of gRPC C#
         /// </summary>
-        public const string CurrentVersion = "2.24.0-pre1";
+        public const string CurrentVersion = "2.24.0-pre2";
     }
 }
diff --git a/src/csharp/build/dependencies.props b/src/csharp/build/dependencies.props
index d0af0321e3f..13d194a5d2d 100644
--- a/src/csharp/build/dependencies.props
+++ b/src/csharp/build/dependencies.props
@@ -1,7 +1,7 @@
 <!-- This file is generated -->
 <Project>
   <PropertyGroup>
-    <GrpcCsharpVersion>2.24.0-pre1</GrpcCsharpVersion>
+    <GrpcCsharpVersion>2.24.0-pre2</GrpcCsharpVersion>
     <GoogleProtobufVersion>3.8.0</GoogleProtobufVersion>
   </PropertyGroup>
 </Project>
diff --git a/src/csharp/build_unitypackage.bat b/src/csharp/build_unitypackage.bat
index 3f835267bcc..dc5d816cc55 100644
--- a/src/csharp/build_unitypackage.bat
+++ b/src/csharp/build_unitypackage.bat
@@ -13,7 +13,7 @@
 @rem limitations under the License.
 
 @rem Current package versions
-set VERSION=2.24.0-pre1
+set VERSION=2.24.0-pre2
 
 @rem Adjust the location of nuget.exe
 set NUGET=C:\nuget\nuget.exe
diff --git a/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec b/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec
index 36126a9cda0..5a6a8cd2315 100644
--- a/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec
+++ b/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec
@@ -42,7 +42,7 @@ Pod::Spec.new do |s|
   # exclamation mark ensures that other "regular" pods will be able to find it as it'll be installed
   # before them.
   s.name     = '!ProtoCompiler-gRPCCppPlugin'
-  v = '1.24.0-pre1'
+  v = '1.24.0-pre2'
   s.version  = v
   s.summary  = 'The gRPC ProtoC plugin generates C++ files from .proto services.'
   s.description = <<-DESC
diff --git a/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec b/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec
index 3b3638fb490..f0d81a6c548 100644
--- a/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec
+++ b/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec
@@ -42,7 +42,7 @@ Pod::Spec.new do |s|
   # exclamation mark ensures that other "regular" pods will be able to find it as it'll be installed
   # before them.
   s.name     = '!ProtoCompiler-gRPCPlugin'
-  v = '1.24.0-pre1'
+  v = '1.24.0-pre2'
   s.version  = v
   s.summary  = 'The gRPC ProtoC plugin generates Objective-C files from .proto services.'
   s.description = <<-DESC
@@ -107,7 +107,12 @@ Pod::Spec.new do |s|
   s.ios.deployment_target = '7.0'
   s.osx.deployment_target = '10.9'
   s.tvos.deployment_target = '10.0'
-  s.watchos.deployment_target = '4.0'
+
+  # watchOS is disabled due to #20258.
+  # TODO (mxyan): Enable watchos when !ProtoCompiler.podspec is updated for
+  # support of watchos in the next release
+  # s.watchos.deployment_target = '4.0'
+
   # Restrict the gRPC runtime version to the one supported by this plugin.
   s.dependency 'gRPC-ProtoRPC', v
 
@@ -116,6 +121,8 @@ Pod::Spec.new do |s|
   # present in this pod's directory. We use that knowledge to check for the existence of the file
   # and, if absent, compile the plugin from the local sources.
   s.prepare_command = <<-CMD
-    #{bazel} build //src/compiler:grpc_objective_c_plugin
+    if [ ! -f #{plugin} ]; then
+      #{bazel} build //src/compiler:grpc_objective_c_plugin
+    fi
   CMD
 end
diff --git a/src/objective-c/!ProtoCompiler.podspec b/src/objective-c/!ProtoCompiler.podspec
index 9d036ac0b5b..a3e49f64795 100644
--- a/src/objective-c/!ProtoCompiler.podspec
+++ b/src/objective-c/!ProtoCompiler.podspec
@@ -123,6 +123,11 @@ Pod::Spec.new do |s|
   bazel = "#{repo_root}/tools/bazel"
   
   s.prepare_command = <<-CMD
-    #{bazel} build @com_google_protobuf//:protoc
+    if [ ! -f bin/protoc ]; then
+      #{bazel} build @com_google_protobuf//:protoc
+    else
+      mv bin/protoc .
+      mv include/google .
+    fi
   CMD
 end
diff --git a/src/objective-c/BoringSSL-GRPC.podspec b/src/objective-c/BoringSSL-GRPC.podspec
index f0d9750d6d1..78cd20f3958 100644
--- a/src/objective-c/BoringSSL-GRPC.podspec
+++ b/src/objective-c/BoringSSL-GRPC.podspec
@@ -39,7 +39,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'BoringSSL-GRPC'
-  version = '0.0.3'
+  version = '0.0.4'
   s.version  = version
   s.summary  = 'BoringSSL is a fork of OpenSSL that is designed to meet Google\'s needs.'
   # Adapted from the homepage:
diff --git a/src/objective-c/GRPCClient/version.h b/src/objective-c/GRPCClient/version.h
index 400be6f51c0..82e699b001a 100644
--- a/src/objective-c/GRPCClient/version.h
+++ b/src/objective-c/GRPCClient/version.h
@@ -22,4 +22,4 @@
 // instead. This file can be regenerated from the template by running
 // `tools/buildgen/generate_projects.sh`.
 
-#define GRPC_OBJC_VERSION_STRING @"1.24.0-pre1"
+#define GRPC_OBJC_VERSION_STRING @"1.24.0-pre2"
diff --git a/src/objective-c/tests/version.h b/src/objective-c/tests/version.h
index 6d0d5b7d545..837a2d44379 100644
--- a/src/objective-c/tests/version.h
+++ b/src/objective-c/tests/version.h
@@ -22,5 +22,5 @@
 // instead. This file can be regenerated from the template by running
 // `tools/buildgen/generate_projects.sh`.
 
-#define GRPC_OBJC_VERSION_STRING @"1.24.0-pre1"
+#define GRPC_OBJC_VERSION_STRING @"1.24.0-pre2"
 #define GRPC_C_VERSION_STRING @"8.0.0"
diff --git a/src/php/ext/grpc/version.h b/src/php/ext/grpc/version.h
index b02a890a593..370f3604ddc 100644
--- a/src/php/ext/grpc/version.h
+++ b/src/php/ext/grpc/version.h
@@ -20,6 +20,6 @@
 #ifndef VERSION_H
 #define VERSION_H
 
-#define PHP_GRPC_VERSION "1.24.0RC1"
+#define PHP_GRPC_VERSION "1.24.0RC2"
 
 #endif /* VERSION_H */
diff --git a/src/python/grpcio/grpc/_grpcio_metadata.py b/src/python/grpcio/grpc/_grpcio_metadata.py
index fde70bada52..31e82e8c638 100644
--- a/src/python/grpcio/grpc/_grpcio_metadata.py
+++ b/src/python/grpcio/grpc/_grpcio_metadata.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio/grpc/_grpcio_metadata.py.template`!!!
 
-__version__ = """1.24.0rc1"""
+__version__ = """1.24.0rc2"""
diff --git a/src/python/grpcio/grpc_version.py b/src/python/grpcio/grpc_version.py
index c6258b050e2..565aaaa75ff 100644
--- a/src/python/grpcio/grpc_version.py
+++ b/src/python/grpcio/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio/grpc_version.py.template`!!!
 
-VERSION = '1.24.0rc1'
+VERSION = '1.24.0rc2'
diff --git a/src/python/grpcio_channelz/grpc_version.py b/src/python/grpcio_channelz/grpc_version.py
index 1d3bd205568..122ff4c3bdd 100644
--- a/src/python/grpcio_channelz/grpc_version.py
+++ b/src/python/grpcio_channelz/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_channelz/grpc_version.py.template`!!!
 
-VERSION = '1.24.0rc1'
+VERSION = '1.24.0rc2'
diff --git a/src/python/grpcio_health_checking/grpc_version.py b/src/python/grpcio_health_checking/grpc_version.py
index 515dbc7c39b..058d12cbc08 100644
--- a/src/python/grpcio_health_checking/grpc_version.py
+++ b/src/python/grpcio_health_checking/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_health_checking/grpc_version.py.template`!!!
 
-VERSION = '1.24.0rc1'
+VERSION = '1.24.0rc2'
diff --git a/src/python/grpcio_reflection/grpc_version.py b/src/python/grpcio_reflection/grpc_version.py
index 3cd36dbc740..53f52e289f8 100644
--- a/src/python/grpcio_reflection/grpc_version.py
+++ b/src/python/grpcio_reflection/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_reflection/grpc_version.py.template`!!!
 
-VERSION = '1.24.0rc1'
+VERSION = '1.24.0rc2'
diff --git a/src/python/grpcio_status/grpc_version.py b/src/python/grpcio_status/grpc_version.py
index fc5beabc388..fe42a15ec15 100644
--- a/src/python/grpcio_status/grpc_version.py
+++ b/src/python/grpcio_status/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_status/grpc_version.py.template`!!!
 
-VERSION = '1.24.0rc1'
+VERSION = '1.24.0rc2'
diff --git a/src/python/grpcio_testing/grpc_version.py b/src/python/grpcio_testing/grpc_version.py
index d3f938c964b..27996b8c8a1 100644
--- a/src/python/grpcio_testing/grpc_version.py
+++ b/src/python/grpcio_testing/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_testing/grpc_version.py.template`!!!
 
-VERSION = '1.24.0rc1'
+VERSION = '1.24.0rc2'
diff --git a/src/python/grpcio_tests/grpc_version.py b/src/python/grpcio_tests/grpc_version.py
index 551c8870779..9a0e8f28ba4 100644
--- a/src/python/grpcio_tests/grpc_version.py
+++ b/src/python/grpcio_tests/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_tests/grpc_version.py.template`!!!
 
-VERSION = '1.24.0rc1'
+VERSION = '1.24.0rc2'
diff --git a/src/ruby/lib/grpc/version.rb b/src/ruby/lib/grpc/version.rb
index 972c10e0258..bf233ce7af7 100644
--- a/src/ruby/lib/grpc/version.rb
+++ b/src/ruby/lib/grpc/version.rb
@@ -14,5 +14,5 @@
 
 # GRPC contains the General RPC module.
 module GRPC
-  VERSION = '1.24.0.pre1'
+  VERSION = '1.24.0.pre2'
 end
diff --git a/src/ruby/tools/version.rb b/src/ruby/tools/version.rb
index f6871b6c81d..fb6fb356232 100644
--- a/src/ruby/tools/version.rb
+++ b/src/ruby/tools/version.rb
@@ -14,6 +14,6 @@
 
 module GRPC
   module Tools
-    VERSION = '1.24.0.pre1'
+    VERSION = '1.24.0.pre2'
   end
 end
diff --git a/templates/gRPC-Core.podspec.template b/templates/gRPC-Core.podspec.template
index 9b77723a854..36b08794b81 100644
--- a/templates/gRPC-Core.podspec.template
+++ b/templates/gRPC-Core.podspec.template
@@ -85,6 +85,7 @@
     s.source = {
       :git => 'https://github.com/grpc/grpc.git',
       :tag => "v#{version}",
+      :submodules => true,
     }
 
     # gRPC podspecs depend on fix for https://github.com/CocoaPods/CocoaPods/issues/6024,
@@ -171,10 +172,9 @@
       ss.header_mappings_dir = '.'
       ss.libraries = 'z'
       ss.dependency "#{s.name}/Interface", version
-      ss.dependency 'BoringSSL-GRPC', '0.0.3'
+      ss.dependency 'BoringSSL-GRPC', '0.0.4'
       ss.compiler_flags = '-DGRPC_SHADOW_BORINGSSL_SYMBOLS'
 
-      # To save you from scrolling, this is the last part of the podspec.
       ss.source_files = ${ruby_multiline_list(grpc_private_files(libs), 22)}
 
       ss.private_header_files = ${ruby_multiline_list(grpc_private_headers(libs), 30)}
diff --git a/templates/gRPC.podspec.template b/templates/gRPC.podspec.template
index e705edc1748..e8afdb14062 100644
--- a/templates/gRPC.podspec.template
+++ b/templates/gRPC.podspec.template
@@ -34,11 +34,6 @@
       :tag => "v#{version}",
     }
 
-    s.ios.deployment_target = '7.0'
-    s.osx.deployment_target = '10.9'
-    s.tvos.deployment_target = '10.0'
-    s.watchos.deployment_target = '4.0'
-
     name = 'GRPCClient'
     s.module_name = name
     s.header_dir = name
@@ -51,25 +46,35 @@
       'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
     }
 
+    s.ios.deployment_target = '7.0'
+    s.osx.deployment_target = '10.9'
+    s.tvos.deployment_target = '10.0'
+    s.watchos.deployment_target = '4.0'
+
     s.subspec 'Interface-Legacy' do |ss|
       ss.header_mappings_dir = 'src/objective-c/GRPCClient'
 
-      ss.public_header_files = "GRPCClient/GRPCCall+ChannelArg.h",
-                               "GRPCClient/GRPCCall+ChannelCredentials.h",
-                               "GRPCClient/GRPCCall+Cronet.h",
-                               "GRPCClient/GRPCCall+OAuth2.h",
-                               "GRPCClient/GRPCCall+Tests.h",
+      ss.public_header_files = "src/objective-c/GRPCClient/GRPCCall+ChannelArg.h",
+                               "src/objective-c/GRPCClient/GRPCCall+ChannelCredentials.h",
+                               "src/objective-c/GRPCClient/GRPCCall+Cronet.h",
+                               "src/objective-c/GRPCClient/GRPCCall+OAuth2.h",
+                               "src/objective-c/GRPCClient/GRPCCall+Tests.h",
                                "src/objective-c/GRPCClient/GRPCCallLegacy.h",
                                "src/objective-c/GRPCClient/GRPCTypes.h"
 
-      ss.source_files = "GRPCClient/GRPCCall+ChannelArg.h",
-                        "GRPCClient/GRPCCall+ChannelCredentials.h",
-                        "GRPCClient/GRPCCall+Cronet.h",
-                        "GRPCClient/GRPCCall+OAuth2.h",
-                        "GRPCClient/GRPCCall+Tests.h",
+      ss.source_files = "src/objective-c/GRPCClient/GRPCCall+ChannelArg.h",
+                        "src/objective-c/GRPCClient/GRPCCall+ChannelCredentials.h",
+                        "src/objective-c/GRPCClient/GRPCCall+Cronet.h",
+                        "src/objective-c/GRPCClient/GRPCCall+OAuth2.h",
+                        "src/objective-c/GRPCClient/GRPCCall+Tests.h",
                         "src/objective-c/GRPCClient/GRPCCallLegacy.h",
                         "src/objective-c/GRPCClient/GRPCTypes.h"
       ss.dependency "gRPC-RxLibrary/Interface", version
+
+      ss.ios.deployment_target = '7.0'
+      ss.osx.deployment_target = '10.9'
+      ss.tvos.deployment_target = '10.0'
+      ss.watchos.deployment_target = '4.0'
     end
 
     s.subspec 'Interface' do |ss|
@@ -100,6 +105,11 @@
                         'src/objective-c/GRPCClient/version.h'
 
       ss.dependency "#{s.name}/Interface-Legacy", version
+
+      ss.ios.deployment_target = '7.0'
+      ss.osx.deployment_target = '10.9'
+      ss.tvos.deployment_target = '10.0'
+      ss.watchos.deployment_target = '4.0'
     end
 
     s.subspec 'GRPCCore' do |ss|
@@ -133,6 +143,11 @@
       ss.dependency "#{s.name}/Interface", version
       ss.dependency 'gRPC-Core', version
       ss.dependency 'gRPC-RxLibrary', version
+
+      ss.ios.deployment_target = '7.0'
+      ss.osx.deployment_target = '10.9'
+      ss.tvos.deployment_target = '10.0'
+      ss.watchos.deployment_target = '4.0'
     end
 
     s.subspec 'GRPCCoreCronet' do |ss|
@@ -144,10 +159,17 @@
       ss.dependency "#{s.name}/GRPCCore", version
       ss.dependency 'gRPC-Core/Cronet-Implementation', version
       ss.dependency 'CronetFramework'
+
+      ss.ios.deployment_target = '8.0'
     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.tvos.deployment_target = '10.0'
+      ss.watchos.deployment_target = '4.0'
     end
   end
diff --git a/templates/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec.template b/templates/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec.template
index 6286e3369e2..85a4ab07a87 100644
--- a/templates/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec.template
+++ b/templates/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec.template
@@ -109,7 +109,12 @@
     s.ios.deployment_target = '7.0'
     s.osx.deployment_target = '10.9'
     s.tvos.deployment_target = '10.0'
-    s.watchos.deployment_target = '4.0'
+
+    # watchOS is disabled due to #20258.
+    # TODO (mxyan): Enable watchos when !ProtoCompiler.podspec is updated for
+    # support of watchos in the next release
+    # s.watchos.deployment_target = '4.0'
+
     # Restrict the gRPC runtime version to the one supported by this plugin.
     s.dependency 'gRPC-ProtoRPC', v
 
@@ -118,6 +123,8 @@
     # present in this pod's directory. We use that knowledge to check for the existence of the file
     # and, if absent, compile the plugin from the local sources.
     s.prepare_command = <<-CMD
-      #{bazel} build //src/compiler:grpc_objective_c_plugin
+      if [ ! -f #{plugin} ]; then
+        #{bazel} build //src/compiler:grpc_objective_c_plugin
+      fi
     CMD
   end
diff --git a/templates/src/objective-c/BoringSSL-GRPC.podspec.template b/templates/src/objective-c/BoringSSL-GRPC.podspec.template
index 3d2736e3307..462283286b6 100644
--- a/templates/src/objective-c/BoringSSL-GRPC.podspec.template
+++ b/templates/src/objective-c/BoringSSL-GRPC.podspec.template
@@ -44,7 +44,7 @@
 
   Pod::Spec.new do |s|
     s.name     = 'BoringSSL-GRPC'
-    version = '0.0.3'
+    version = '0.0.4'
     s.version  = version
     s.summary  = 'BoringSSL is a fork of OpenSSL that is designed to meet Google\'s needs.'
     # Adapted from the homepage:
diff --git a/tools/distrib/python/grpcio_tools/grpc_version.py b/tools/distrib/python/grpcio_tools/grpc_version.py
index 55153c152f1..9aae9350b54 100644
--- a/tools/distrib/python/grpcio_tools/grpc_version.py
+++ b/tools/distrib/python/grpcio_tools/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/tools/distrib/python/grpcio_tools/grpc_version.py.template`!!!
 
-VERSION = '1.24.0rc1'
+VERSION = '1.24.0rc2'
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index e6bf9f506f1..2b22fb1ae3d 100644
--- a/tools/doxygen/Doxyfile.c++
+++ b/tools/doxygen/Doxyfile.c++
@@ -40,7 +40,7 @@ PROJECT_NAME           = "GRPC C++"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 1.24.0-pre1
+PROJECT_NUMBER         = 1.24.0-pre2
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index 216a44db366..e604124986d 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -40,7 +40,7 @@ PROJECT_NAME           = "GRPC C++"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 1.24.0-pre1
+PROJECT_NUMBER         = 1.24.0-pre2
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index 1ff37ca85af..c0ac37b6c56 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -1102,17 +1102,19 @@ class ObjCLanguage(object):
                     'EXAMPLE_PATH': 'src/objective-c/examples/tvOS-sample',
                     'FRAMEWORKS': 'NO'
                 }))
-        out.append(
-            self.config.job_spec(
-                ['src/objective-c/tests/build_one_example_bazel.sh'],
-                timeout_seconds=20 * 60,
-                shortname='ios-buildtest-example-watchOS-sample',
-                cpu_cost=1e6,
-                environ={
-                    'SCHEME': 'watchOS-sample-WatchKit-App',
-                    'EXAMPLE_PATH': 'src/objective-c/examples/watchOS-sample',
-                    'FRAMEWORKS': 'NO'
-                }))
+        # Disabled due to #20258
+        # TODO (mxyan): Reenable this test when #20258 is resolved.
+        # out.append(
+        #     self.config.job_spec(
+        #         ['src/objective-c/tests/build_one_example_bazel.sh'],
+        #         timeout_seconds=20 * 60,
+        #         shortname='ios-buildtest-example-watchOS-sample',
+        #         cpu_cost=1e6,
+        #         environ={
+        #             'SCHEME': 'watchOS-sample-WatchKit-App',
+        #             'EXAMPLE_PATH': 'src/objective-c/examples/watchOS-sample',
+        #             'FRAMEWORKS': 'NO'
+        #         }))
         out.append(
             self.config.job_spec(
                 ['src/objective-c/tests/run_plugin_tests.sh'],