diff --git a/CMakeLists.txt b/CMakeLists.txt
index ddde167ecf0..b685246e5e4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,12 +25,12 @@
 cmake_minimum_required(VERSION 3.5.1)
 
 set(PACKAGE_NAME          "grpc")
-set(PACKAGE_VERSION       "1.33.0-dev")
-set(gRPC_CORE_VERSION     "12.0.0")
-set(gRPC_CORE_SOVERSION   "12")
-set(gRPC_CPP_VERSION      "1.33.0-dev")
+set(PACKAGE_VERSION       "1.33.0-pre1")
+set(gRPC_CORE_VERSION     "13.0.0")
+set(gRPC_CORE_SOVERSION   "13")
+set(gRPC_CPP_VERSION      "1.33.0-pre1")
 set(gRPC_CPP_SOVERSION    "1")
-set(gRPC_CSHARP_VERSION   "2.33.0-dev")
+set(gRPC_CSHARP_VERSION   "2.33.0-pre1")
 set(gRPC_CSHARP_SOVERSION "2")
 set(PACKAGE_STRING        "${PACKAGE_NAME} ${PACKAGE_VERSION}")
 set(PACKAGE_TARNAME       "${PACKAGE_NAME}-${PACKAGE_VERSION}")
diff --git a/Makefile b/Makefile
index 9c5ac031012..a5936cc2977 100644
--- a/Makefile
+++ b/Makefile
@@ -455,9 +455,9 @@ E = @echo
 Q = @
 endif
 
-CORE_VERSION = 12.0.0
-CPP_VERSION = 1.33.0-dev
-CSHARP_VERSION = 2.33.0-dev
+CORE_VERSION = 13.0.0
+CPP_VERSION = 1.33.0-pre1
+CSHARP_VERSION = 2.33.0-pre1
 
 CPPFLAGS_NO_ARCH += $(addprefix -I, $(INCLUDES)) $(addprefix -D, $(DEFINES))
 CPPFLAGS += $(CPPFLAGS_NO_ARCH) $(ARCH_FLAGS)
@@ -493,7 +493,7 @@ SHARED_EXT_CORE = dll
 SHARED_EXT_CPP = dll
 SHARED_EXT_CSHARP = dll
 SHARED_PREFIX =
-SHARED_VERSION_CORE = -12
+SHARED_VERSION_CORE = -13
 SHARED_VERSION_CPP = -1
 SHARED_VERSION_CSHARP = -2
 else ifeq ($(SYSTEM),Darwin)
@@ -1679,8 +1679,8 @@ $(LIBDIR)/$(CONFIG)/libaddress_sorting$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE):
 ifeq ($(SYSTEM),Darwin)
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name $(SHARED_PREFIX)address_sorting$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libaddress_sorting$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBADDRESS_SORTING_OBJS) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
 else
-	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libaddress_sorting.so.12 -o $(LIBDIR)/$(CONFIG)/libaddress_sorting$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBADDRESS_SORTING_OBJS) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
-	$(Q) ln -sf $(SHARED_PREFIX)address_sorting$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libaddress_sorting$(SHARED_VERSION_CORE).so.12
+	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libaddress_sorting.so.13 -o $(LIBDIR)/$(CONFIG)/libaddress_sorting$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBADDRESS_SORTING_OBJS) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
+	$(Q) ln -sf $(SHARED_PREFIX)address_sorting$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libaddress_sorting$(SHARED_VERSION_CORE).so.13
 	$(Q) ln -sf $(SHARED_PREFIX)address_sorting$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libaddress_sorting$(SHARED_VERSION_CORE).so
 endif
 endif
@@ -1804,8 +1804,8 @@ $(LIBDIR)/$(CONFIG)/libgpr$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE): $(LIBGPR_OB
 ifeq ($(SYSTEM),Darwin)
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name $(SHARED_PREFIX)gpr$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgpr$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGPR_OBJS) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
 else
-	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgpr.so.12 -o $(LIBDIR)/$(CONFIG)/libgpr$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGPR_OBJS) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
-	$(Q) ln -sf $(SHARED_PREFIX)gpr$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgpr$(SHARED_VERSION_CORE).so.12
+	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgpr.so.13 -o $(LIBDIR)/$(CONFIG)/libgpr$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGPR_OBJS) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
+	$(Q) ln -sf $(SHARED_PREFIX)gpr$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgpr$(SHARED_VERSION_CORE).so.13
 	$(Q) ln -sf $(SHARED_PREFIX)gpr$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgpr$(SHARED_VERSION_CORE).so
 endif
 endif
@@ -2310,8 +2310,8 @@ $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE): $(LIBGRPC_
 ifeq ($(SYSTEM),Darwin)
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name $(SHARED_PREFIX)grpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_OBJS) $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a $(OPENSSL_MERGE_LIBS) $(LDLIBS_SECURE) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
 else
-	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc.so.12 -o $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_OBJS) $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a $(OPENSSL_MERGE_LIBS) $(LDLIBS_SECURE) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
-	$(Q) ln -sf $(SHARED_PREFIX)grpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).so.12
+	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc.so.13 -o $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_OBJS) $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a $(OPENSSL_MERGE_LIBS) $(LDLIBS_SECURE) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
+	$(Q) ln -sf $(SHARED_PREFIX)grpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).so.13
 	$(Q) ln -sf $(SHARED_PREFIX)grpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).so
 endif
 endif
@@ -2369,8 +2369,8 @@ $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE):
 ifeq ($(SYSTEM),Darwin)
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name $(SHARED_PREFIX)grpc_csharp_ext$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_CSHARP_EXT_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
 else
-	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc_csharp_ext.so.12 -o $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_CSHARP_EXT_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
-	$(Q) ln -sf $(SHARED_PREFIX)grpc_csharp_ext$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext$(SHARED_VERSION_CORE).so.12
+	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc_csharp_ext.so.13 -o $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_CSHARP_EXT_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
+	$(Q) ln -sf $(SHARED_PREFIX)grpc_csharp_ext$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext$(SHARED_VERSION_CORE).so.13
 	$(Q) ln -sf $(SHARED_PREFIX)grpc_csharp_ext$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc_csharp_ext$(SHARED_VERSION_CORE).so
 endif
 endif
@@ -2710,8 +2710,8 @@ $(LIBDIR)/$(CONFIG)/libgrpc_unsecure$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE): $
 ifeq ($(SYSTEM),Darwin)
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name $(SHARED_PREFIX)grpc_unsecure$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libgrpc_unsecure$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_UNSECURE_OBJS) $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
 else
-	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc_unsecure.so.12 -o $(LIBDIR)/$(CONFIG)/libgrpc_unsecure$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_UNSECURE_OBJS) $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
-	$(Q) ln -sf $(SHARED_PREFIX)grpc_unsecure$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc_unsecure$(SHARED_VERSION_CORE).so.12
+	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc_unsecure.so.13 -o $(LIBDIR)/$(CONFIG)/libgrpc_unsecure$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_UNSECURE_OBJS) $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
+	$(Q) ln -sf $(SHARED_PREFIX)grpc_unsecure$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc_unsecure$(SHARED_VERSION_CORE).so.13
 	$(Q) ln -sf $(SHARED_PREFIX)grpc_unsecure$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc_unsecure$(SHARED_VERSION_CORE).so
 endif
 endif
@@ -4023,8 +4023,8 @@ $(LIBDIR)/$(CONFIG)/libupb$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE): $(LIBUPB_OB
 ifeq ($(SYSTEM),Darwin)
 	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -install_name $(SHARED_PREFIX)upb$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) -dynamiclib -o $(LIBDIR)/$(CONFIG)/libupb$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBUPB_OBJS) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
 else
-	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libupb.so.12 -o $(LIBDIR)/$(CONFIG)/libupb$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBUPB_OBJS) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
-	$(Q) ln -sf $(SHARED_PREFIX)upb$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libupb$(SHARED_VERSION_CORE).so.12
+	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libupb.so.13 -o $(LIBDIR)/$(CONFIG)/libupb$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBUPB_OBJS) $(ZLIB_MERGE_LIBS) $(CARES_MERGE_LIBS) $(ADDRESS_SORTING_MERGE_LIBS) $(RE2_MERGE_LIBS) $(UPB_MERGE_LIBS) $(GRPC_ABSEIL_MERGE_LIBS) $(LDLIBS)
+	$(Q) ln -sf $(SHARED_PREFIX)upb$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libupb$(SHARED_VERSION_CORE).so.13
 	$(Q) ln -sf $(SHARED_PREFIX)upb$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libupb$(SHARED_VERSION_CORE).so
 endif
 endif
diff --git a/build_config.rb b/build_config.rb
index 642399878ae..031c588b222 100644
--- a/build_config.rb
+++ b/build_config.rb
@@ -13,5 +13,5 @@
 # limitations under the License.
 
 module GrpcBuildConfig
-  CORE_WINDOWS_DLL = '/tmp/libs/opt/grpc-12.dll'
+  CORE_WINDOWS_DLL = '/tmp/libs/opt/grpc-13.dll'
 end
diff --git a/gRPC-C++.podspec b/gRPC-C++.podspec
index fddd11a3b95..74869a7b504 100644
--- a/gRPC-C++.podspec
+++ b/gRPC-C++.podspec
@@ -22,7 +22,7 @@
 Pod::Spec.new do |s|
   s.name     = 'gRPC-C++'
   # TODO (mxyan): use version that match gRPC version when pod is stabilized
-  version = '1.33.0-dev'
+  version = '1.33.0-pre1'
   s.version  = version
   s.summary  = 'gRPC C++ library'
   s.homepage = 'https://grpc.io'
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index cac4780827c..0807ff97501 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-Core'
-  version = '1.33.0-dev'
+  version = '1.33.0-pre1'
   s.version  = version
   s.summary  = 'Core cross-platform gRPC library, written in C'
   s.homepage = 'https://grpc.io'
diff --git a/gRPC-ProtoRPC.podspec b/gRPC-ProtoRPC.podspec
index bcc6ffe249c..4467b707068 100644
--- a/gRPC-ProtoRPC.podspec
+++ b/gRPC-ProtoRPC.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-ProtoRPC'
-  version = '1.33.0-dev'
+  version = '1.33.0-pre1'
   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 83fff1d66f2..f1906216b7a 100644
--- a/gRPC-RxLibrary.podspec
+++ b/gRPC-RxLibrary.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-RxLibrary'
-  version = '1.33.0-dev'
+  version = '1.33.0-pre1'
   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 70557e55134..b84cd4cb23a 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -20,7 +20,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC'
-  version = '1.33.0-dev'
+  version = '1.33.0-pre1'
   s.version  = version
   s.summary  = 'gRPC client library for iOS/OSX'
   s.homepage = 'https://grpc.io'
diff --git a/package.xml b/package.xml
index fc2d104ac74..0d6b1abfbdc 100644
--- a/package.xml
+++ b/package.xml
@@ -13,8 +13,8 @@
  <date>2019-09-24</date>
  <time>16:06:07</time>
  <version>
-  <release>1.33.0dev</release>
-  <api>1.33.0dev</api>
+  <release>1.33.0RC1</release>
+  <api>1.33.0RC1</api>
  </version>
  <stability>
   <release>beta</release>
diff --git a/src/core/lib/surface/version.cc b/src/core/lib/surface/version.cc
index e022da47a69..bed4f427e99 100644
--- a/src/core/lib/surface/version.cc
+++ b/src/core/lib/surface/version.cc
@@ -23,6 +23,6 @@
 
 #include <grpc/grpc.h>
 
-const char* grpc_version_string(void) { return "12.0.0"; }
+const char* grpc_version_string(void) { return "13.0.0"; }
 
 const char* grpc_g_stands_for(void) { return "geeky"; }
diff --git a/src/cpp/common/version_cc.cc b/src/cpp/common/version_cc.cc
index 479c4fa228f..1a740760a4e 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 {
-std::string Version() { return "1.33.0-dev"; }
+std::string Version() { return "1.33.0-pre1"; }
 }  // namespace grpc
diff --git a/src/csharp/Grpc.Core.Api/VersionInfo.cs b/src/csharp/Grpc.Core.Api/VersionInfo.cs
index feaf39ccdf0..8bd8398c91f 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 = "2.33.0-dev";
+        public const string CurrentVersion = "2.33.0-pre1";
     }
 }
diff --git a/src/csharp/build/dependencies.props b/src/csharp/build/dependencies.props
index 9fcb122009e..035719a112e 100644
--- a/src/csharp/build/dependencies.props
+++ b/src/csharp/build/dependencies.props
@@ -1,7 +1,7 @@
 <!-- This file is generated -->
 <Project>
   <PropertyGroup>
-    <GrpcCsharpVersion>2.33.0-dev</GrpcCsharpVersion>
+    <GrpcCsharpVersion>2.33.0-pre1</GrpcCsharpVersion>
     <GoogleProtobufVersion>3.13.0</GoogleProtobufVersion>
   </PropertyGroup>
 </Project>
diff --git a/src/csharp/build_unitypackage.bat b/src/csharp/build_unitypackage.bat
index 46b66dc59a7..0eb78625d7c 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=2.33.0-dev
+set VERSION=2.33.0-pre1
 
 @rem Adjust the location of nuget.exe
 set NUGET=nuget
diff --git a/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec b/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec
index 71c71503033..7ccdeaf0617 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 = '1.33.0-dev'
+  v = '1.33.0-pre1'
   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 bdb3a66de1e..75d90dcbe1a 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 = '1.33.0-dev'
+  v = '1.33.0-pre1'
   s.version  = v
   s.summary  = 'The gRPC ProtoC plugin generates Objective-C files from .proto services.'
   s.description = <<-DESC
diff --git a/src/objective-c/GRPCClient/version.h b/src/objective-c/GRPCClient/version.h
index d9e73d2eb4b..f9641e3b854 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 @"1.33.0-dev"
+#define GRPC_OBJC_VERSION_STRING @"1.33.0-pre1"
diff --git a/src/objective-c/tests/version.h b/src/objective-c/tests/version.h
index 902692831b3..4a0e3292a97 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 @"1.33.0-dev"
-#define GRPC_C_VERSION_STRING @"12.0.0"
+#define GRPC_OBJC_VERSION_STRING @"1.33.0-pre1"
+#define GRPC_C_VERSION_STRING @"13.0.0"
diff --git a/src/php/ext/grpc/version.h b/src/php/ext/grpc/version.h
index 55111a5ad0b..f3ad85d0f7f 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 "1.33.0dev"
+#define PHP_GRPC_VERSION "1.33.0RC1"
 
 #endif /* VERSION_H */
diff --git a/src/python/grpcio/grpc/_grpcio_metadata.py b/src/python/grpcio/grpc/_grpcio_metadata.py
index fe2b7f5879d..53d8ebd8521 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__ = """1.33.0.dev0"""
+__version__ = """1.33.0rc1"""
diff --git a/src/python/grpcio/grpc_version.py b/src/python/grpcio/grpc_version.py
index 036c15b0ecb..36c558cc727 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 = '1.33.0.dev0'
+VERSION = '1.33.0rc1'
diff --git a/src/python/grpcio_channelz/grpc_version.py b/src/python/grpcio_channelz/grpc_version.py
index 85bece3c009..c3389a289fb 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 = '1.33.0.dev0'
+VERSION = '1.33.0rc1'
diff --git a/src/python/grpcio_health_checking/grpc_version.py b/src/python/grpcio_health_checking/grpc_version.py
index 815fff2a3f8..f2f7ab76040 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 = '1.33.0.dev0'
+VERSION = '1.33.0rc1'
diff --git a/src/python/grpcio_reflection/grpc_version.py b/src/python/grpcio_reflection/grpc_version.py
index 2dd4b7403e0..e4a3993b164 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 = '1.33.0.dev0'
+VERSION = '1.33.0rc1'
diff --git a/src/python/grpcio_status/grpc_version.py b/src/python/grpcio_status/grpc_version.py
index 03ef182a288..dab043a8667 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 = '1.33.0.dev0'
+VERSION = '1.33.0rc1'
diff --git a/src/python/grpcio_testing/grpc_version.py b/src/python/grpcio_testing/grpc_version.py
index c74f56c17cf..e95573f8030 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 = '1.33.0.dev0'
+VERSION = '1.33.0rc1'
diff --git a/src/python/grpcio_tests/grpc_version.py b/src/python/grpcio_tests/grpc_version.py
index 82e01e25915..c2d92b7165d 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 = '1.33.0.dev0'
+VERSION = '1.33.0rc1'
diff --git a/src/ruby/lib/grpc/version.rb b/src/ruby/lib/grpc/version.rb
index daabad9e9a4..7459f68b7c3 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 = '1.33.0.dev'
+  VERSION = '1.33.0.pre1'
 end
diff --git a/src/ruby/tools/version.rb b/src/ruby/tools/version.rb
index c21abf825e6..6b96340f5c9 100644
--- a/src/ruby/tools/version.rb
+++ b/src/ruby/tools/version.rb
@@ -14,6 +14,6 @@
 
 module GRPC
   module Tools
-    VERSION = '1.33.0.dev'
+    VERSION = '1.33.0.pre1'
   end
 end
diff --git a/tools/distrib/python/grpc_version.py b/tools/distrib/python/grpc_version.py
index fec9dadecf4..cef9ce3be6e 100644
--- a/tools/distrib/python/grpc_version.py
+++ b/tools/distrib/python/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/tools/distrib/python/grpcio_tools/grpc_version.py.template`!!!
 
-VERSION = '1.33.0.dev0'
+VERSION = '1.33.0rc1'
diff --git a/tools/distrib/python/grpcio_tools/grpc_version.py b/tools/distrib/python/grpcio_tools/grpc_version.py
index 54a1dd53902..9c4fa80ff8c 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 = '1.33.0.dev0'
+VERSION = '1.33.0rc1'
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index 376bfcbfae1..1d3c4e02f61 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         = 1.33.0-dev
+PROJECT_NUMBER         = 1.33.0-pre1
 
 # 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 b51eadf7755..a87e41ca67a 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         = 1.33.0-dev
+PROJECT_NUMBER         = 1.33.0-pre1
 
 # 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.core b/tools/doxygen/Doxyfile.core
index dc51def7ed2..99526001078 100644
--- a/tools/doxygen/Doxyfile.core
+++ b/tools/doxygen/Doxyfile.core
@@ -40,7 +40,7 @@ PROJECT_NAME           = "GRPC Core"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 12.0.0
+PROJECT_NUMBER         = 13.0.0
 
 # 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.core.internal b/tools/doxygen/Doxyfile.core.internal
index d175f922014..47013546dad 100644
--- a/tools/doxygen/Doxyfile.core.internal
+++ b/tools/doxygen/Doxyfile.core.internal
@@ -40,7 +40,7 @@ PROJECT_NAME           = "GRPC Core"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 12.0.0
+PROJECT_NUMBER         = 13.0.0
 
 # 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.objc b/tools/doxygen/Doxyfile.objc
index 5bcec39f1d8..e14410ad291 100644
--- a/tools/doxygen/Doxyfile.objc
+++ b/tools/doxygen/Doxyfile.objc
@@ -40,7 +40,7 @@ PROJECT_NAME           = "GRPC Objective-C"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 1.33.0-dev
+PROJECT_NUMBER         = 1.33.0-pre1
 
 # 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.objc.internal b/tools/doxygen/Doxyfile.objc.internal
index 1c8424a48b0..ce0394ffa2b 100644
--- a/tools/doxygen/Doxyfile.objc.internal
+++ b/tools/doxygen/Doxyfile.objc.internal
@@ -40,7 +40,7 @@ PROJECT_NAME           = "GRPC Objective-C"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 1.33.0-dev
+PROJECT_NUMBER         = 1.33.0-pre1
 
 # 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.php b/tools/doxygen/Doxyfile.php
index 097f40fb947..2226d145297 100644
--- a/tools/doxygen/Doxyfile.php
+++ b/tools/doxygen/Doxyfile.php
@@ -40,7 +40,7 @@ PROJECT_NAME           = "GRPC PHP"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 1.33.0-dev
+PROJECT_NUMBER         = 1.33.0-pre1
 
 # 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