diff --git a/BUILD b/BUILD
index ed64d0b038f..120e57b1b94 100644
--- a/BUILD
+++ b/BUILD
@@ -183,7 +183,7 @@ g_stands_for = "gracious"  # @unused
 
 core_version = "31.0.0"  # @unused
 
-version = "1.54.0-dev"  # @unused
+version = "1.55.0-dev"  # @unused
 
 GPR_PUBLIC_HDRS = [
     "include/grpc/support/alloc.h",
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1d018425ab2..587fe417af7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,13 +25,13 @@
 cmake_minimum_required(VERSION 3.8)
 
 set(PACKAGE_NAME          "grpc")
-set(PACKAGE_VERSION       "1.54.0-dev")
+set(PACKAGE_VERSION       "1.55.0-dev")
 set(gRPC_CORE_VERSION     "31.0.0")
 set(gRPC_CORE_SOVERSION   "31")
-set(gRPC_CPP_VERSION      "1.54.0-dev")
-set(gRPC_CPP_SOVERSION    "1.54")
-set(gRPC_CSHARP_VERSION   "2.54.0-dev")
-set(gRPC_CSHARP_SOVERSION "2.54")
+set(gRPC_CPP_VERSION      "1.55.0-dev")
+set(gRPC_CPP_SOVERSION    "1.55")
+set(gRPC_CSHARP_VERSION   "2.55.0-dev")
+set(gRPC_CSHARP_SOVERSION "2.55")
 set(PACKAGE_STRING        "${PACKAGE_NAME} ${PACKAGE_VERSION}")
 set(PACKAGE_TARNAME       "${PACKAGE_NAME}-${PACKAGE_VERSION}")
 set(PACKAGE_BUGREPORT     "https://github.com/grpc/grpc/issues/")
@@ -302,7 +302,7 @@ endif()
 if (gRPC_XDS_USER_AGENT_IS_CSHARP)
   # The value of the defines needs to contain quotes.
   # See https://github.com/grpc/grpc/blob/fbf32836a418cc84f58786700273b65cb9174e1d/src/core/ext/xds/xds_api.cc#L854
-  add_definitions("-DGRPC_XDS_USER_AGENT_NAME_SUFFIX=\"csharp\"" "-DGRPC_XDS_USER_AGENT_VERSION_SUFFIX=\"2.54.0-dev\"")
+  add_definitions("-DGRPC_XDS_USER_AGENT_NAME_SUFFIX=\"csharp\"" "-DGRPC_XDS_USER_AGENT_VERSION_SUFFIX=\"2.55.0-dev\"")
 endif()
 
 if(UNIX AND NOT HAIKU)
diff --git a/Makefile b/Makefile
index 6dcb066f60c..8196861a80e 100644
--- a/Makefile
+++ b/Makefile
@@ -411,8 +411,8 @@ Q = @
 endif
 
 CORE_VERSION = 31.0.0
-CPP_VERSION = 1.54.0-dev
-CSHARP_VERSION = 2.54.0-dev
+CPP_VERSION = 1.55.0-dev
+CSHARP_VERSION = 2.55.0-dev
 
 CPPFLAGS_NO_ARCH += $(addprefix -I, $(INCLUDES)) $(addprefix -D, $(DEFINES))
 CPPFLAGS += $(CPPFLAGS_NO_ARCH) $(ARCH_FLAGS)
diff --git a/_metadata.py b/_metadata.py
index 663de8d5acc..455105b52c2 100644
--- a/_metadata.py
+++ b/_metadata.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/_metadata.py.template`!!!
 
-__version__ = """1.54.0.dev0"""
+__version__ = """1.55.0.dev0"""
diff --git a/build_handwritten.yaml b/build_handwritten.yaml
index 5e9c422ecd9..24ca4a40d1c 100644
--- a/build_handwritten.yaml
+++ b/build_handwritten.yaml
@@ -16,7 +16,7 @@ settings:
   csharp_major_version: 2
   g_stands_for: gracious
   protobuf_version: 3.21.12
-  version: 1.54.0-dev
+  version: 1.55.0-dev
 configs:
   asan:
     CC: clang
diff --git a/config.m4 b/config.m4
index 5b7b97098a8..f6f6798832b 100644
--- a/config.m4
+++ b/config.m4
@@ -1277,7 +1277,7 @@ if test "$PHP_GRPC" != "no"; then
     -D_HAS_EXCEPTIONS=0 -DNOMINMAX -DGRPC_ARES=0 \
     -DGRPC_POSIX_FORK_ALLOW_PTHREAD_ATFORK=1 \
     -DGRPC_XDS_USER_AGENT_NAME_SUFFIX='"\"PHP\""' \
-    -DGRPC_XDS_USER_AGENT_VERSION_SUFFIX='"\"1.54.0dev\""')
+    -DGRPC_XDS_USER_AGENT_VERSION_SUFFIX='"\"1.55.0dev\""')
 
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/filters/backend_metrics)
   PHP_ADD_BUILD_DIR($ext_builddir/src/core/ext/filters/census)
diff --git a/doc/g_stands_for.md b/doc/g_stands_for.md
index a06b6afcbff..38f5d90a9ac 100644
--- a/doc/g_stands_for.md
+++ b/doc/g_stands_for.md
@@ -53,4 +53,5 @@
 - 1.51 'g' stands for ['galaxy'](https://github.com/grpc/grpc/tree/v1.51.x)
 - 1.52 'g' stands for ['gribkoff'](https://github.com/grpc/grpc/tree/v1.52.x)
 - 1.53 'g' stands for ['glockenspiel'](https://github.com/grpc/grpc/tree/v1.53.x)
-- 1.54 'g' stands for ['gracious'](https://github.com/grpc/grpc/tree/master)
+- 1.54 'g' stands for ['gracious'](https://github.com/grpc/grpc/tree/v1.54.x)
+- 1.55 'g' stands for ['gracious'](https://github.com/grpc/grpc/tree/master)
diff --git a/gRPC-C++.podspec b/gRPC-C++.podspec
index 6a7b68f83f3..d3e2cfd1f49 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 = '1.54.0-dev'
+  version = '1.55.0-dev'
   s.version  = version
   s.summary  = 'gRPC C++ library'
   s.homepage = 'https://grpc.io'
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 3538133b3ec..ba6245b9eb4 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-Core'
-  version = '1.54.0-dev'
+  version = '1.55.0-dev'
   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 4349e589cc1..85f978b65b7 100644
--- a/gRPC-ProtoRPC.podspec
+++ b/gRPC-ProtoRPC.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-ProtoRPC'
-  version = '1.54.0-dev'
+  version = '1.55.0-dev'
   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 d4c08c920f2..ebddd84dbd5 100644
--- a/gRPC-RxLibrary.podspec
+++ b/gRPC-RxLibrary.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-RxLibrary'
-  version = '1.54.0-dev'
+  version = '1.55.0-dev'
   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 da989ae34ed..dd85cf9f5b3 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -20,7 +20,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC'
-  version = '1.54.0-dev'
+  version = '1.55.0-dev'
   s.version  = version
   s.summary  = 'gRPC client library for iOS/OSX'
   s.homepage = 'https://grpc.io'
diff --git a/include/grpcpp/version_info.h b/include/grpcpp/version_info.h
index 86b3c62b6ec..1c3041d24a7 100644
--- a/include/grpcpp/version_info.h
+++ b/include/grpcpp/version_info.h
@@ -19,9 +19,9 @@
 #define GRPCPP_VERSION_INFO_H
 
 #define GRPC_CPP_VERSION_MAJOR 1
-#define GRPC_CPP_VERSION_MINOR 54
+#define GRPC_CPP_VERSION_MINOR 55
 #define GRPC_CPP_VERSION_PATCH 0
 #define GRPC_CPP_VERSION_TAG "dev"
-#define GRPC_CPP_VERSION_STRING "1.54.0-dev"
+#define GRPC_CPP_VERSION_STRING "1.55.0-dev"
 
 #endif  // GRPCPP_VERSION_INFO_H
diff --git a/package.xml b/package.xml
index 806ed773534..6a3ca1e1ec3 100644
--- a/package.xml
+++ b/package.xml
@@ -13,8 +13,8 @@
  <date>2019-09-24</date>
  <time>16:06:07</time>
  <version>
-  <release>1.54.0dev</release>
-  <api>1.54.0dev</api>
+  <release>1.55.0dev</release>
+  <api>1.55.0dev</api>
  </version>
  <stability>
   <release>beta</release>
@@ -22,7 +22,7 @@
  </stability>
  <license>Apache 2.0</license>
  <notes>
-- gRPC Core 1.54.0 update
+- gRPC Core 1.55.0 update
  </notes>
  <contents>
   <dir baseinstalldir="/" name="/">
diff --git a/src/csharp/build/dependencies.props b/src/csharp/build/dependencies.props
index 37c7bc674c1..5875b80ac01 100644
--- a/src/csharp/build/dependencies.props
+++ b/src/csharp/build/dependencies.props
@@ -1,7 +1,7 @@
 <!-- This file is generated -->
 <Project>
   <PropertyGroup>
-    <GrpcCsharpVersion>2.54.0-dev</GrpcCsharpVersion>
+    <GrpcCsharpVersion>2.55.0-dev</GrpcCsharpVersion>
     <GoogleProtobufVersion>3.21.12</GoogleProtobufVersion>
   </PropertyGroup>
 </Project>
diff --git a/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec b/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec
index 42edea8db1c..fc9f59ebce6 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 = '1.54.0-dev'
+  v = '1.55.0-dev'
   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 92cd3519f29..268c7b566d0 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 = '1.54.0-dev'
+  v = '1.55.0-dev'
   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 2ca0ec6ffc8..220a90aea27 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 @"1.54.0-dev"
+#define GRPC_OBJC_VERSION_STRING @"1.55.0-dev"
diff --git a/src/objective-c/tests/version.h b/src/objective-c/tests/version.h
index 58064a8167d..f9294ad04ad 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 @"1.54.0-dev"
+#define GRPC_OBJC_VERSION_STRING @"1.55.0-dev"
 #define GRPC_C_VERSION_STRING @"31.0.0"
diff --git a/src/php/composer.json b/src/php/composer.json
index fe6cad4295a..16b5285342d 100644
--- a/src/php/composer.json
+++ b/src/php/composer.json
@@ -2,7 +2,7 @@
   "name": "grpc/grpc-dev",
   "description": "gRPC library for PHP - for Development use only",
   "license": "Apache-2.0",
-  "version": "1.54.0",
+  "version": "1.55.0",
   "require": {
     "php": ">=7.0.0",
     "google/protobuf": "^v3.3.0"
diff --git a/src/php/ext/grpc/version.h b/src/php/ext/grpc/version.h
index 5ad4d32c36d..aca65dacd06 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 "1.54.0dev"
+#define PHP_GRPC_VERSION "1.55.0dev"
 
 #endif /* VERSION_H */
diff --git a/src/python/grpcio/grpc/_grpcio_metadata.py b/src/python/grpcio/grpc/_grpcio_metadata.py
index 7bcc77f3746..791e5f0f3a1 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__ = """1.54.0.dev0"""
+__version__ = """1.55.0.dev0"""
diff --git a/src/python/grpcio/grpc_version.py b/src/python/grpcio/grpc_version.py
index 408b76230c5..9f402d7d9ac 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 = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
diff --git a/src/python/grpcio_admin/grpc_version.py b/src/python/grpcio_admin/grpc_version.py
index c778a8c50b1..a5dc09d1b0c 100644
--- a/src/python/grpcio_admin/grpc_version.py
+++ b/src/python/grpcio_admin/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_admin/grpc_version.py.template`!!!
 
-VERSION = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
diff --git a/src/python/grpcio_channelz/grpc_version.py b/src/python/grpcio_channelz/grpc_version.py
index 83debb075cd..47f73261688 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 = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
diff --git a/src/python/grpcio_csds/grpc_version.py b/src/python/grpcio_csds/grpc_version.py
index ffeac656f17..0c548779dc1 100644
--- a/src/python/grpcio_csds/grpc_version.py
+++ b/src/python/grpcio_csds/grpc_version.py
@@ -14,4 +14,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_csds/grpc_version.py.template`!!!
 
-VERSION = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
diff --git a/src/python/grpcio_health_checking/grpc_version.py b/src/python/grpcio_health_checking/grpc_version.py
index 72fb54c43fc..0e22692bcf6 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 = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
diff --git a/src/python/grpcio_reflection/grpc_version.py b/src/python/grpcio_reflection/grpc_version.py
index 6dcf1062815..4d3efbb4f69 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 = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
diff --git a/src/python/grpcio_status/grpc_version.py b/src/python/grpcio_status/grpc_version.py
index 6b60303ee99..ca3769d4d3d 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 = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
diff --git a/src/python/grpcio_testing/grpc_version.py b/src/python/grpcio_testing/grpc_version.py
index 00055d8b959..7b4718d78d3 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 = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
diff --git a/src/python/grpcio_tests/grpc_version.py b/src/python/grpcio_tests/grpc_version.py
index 86e4138d77c..000c92c95f5 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 = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
diff --git a/src/ruby/lib/grpc/version.rb b/src/ruby/lib/grpc/version.rb
index b0c27ef6d74..197574c8247 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 = '1.54.0.dev'
+  VERSION = '1.55.0.dev'
 end
diff --git a/src/ruby/tools/version.rb b/src/ruby/tools/version.rb
index 8d80d4648b3..ca0578c2f5d 100644
--- a/src/ruby/tools/version.rb
+++ b/src/ruby/tools/version.rb
@@ -14,6 +14,6 @@
 
 module GRPC
   module Tools
-    VERSION = '1.54.0.dev'
+    VERSION = '1.55.0.dev'
   end
 end
diff --git a/tools/distrib/python/grpc_version.py b/tools/distrib/python/grpc_version.py
index 209589ed27a..02777a84ea7 100644
--- a/tools/distrib/python/grpc_version.py
+++ b/tools/distrib/python/grpc_version.py
@@ -14,5 +14,5 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/tools/distrib/python/grpcio_tools/grpc_version.py.template`!!!
 
-VERSION = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
 PROTOBUF_VERSION = '3.21.12'
diff --git a/tools/distrib/python/grpcio_tools/grpc_version.py b/tools/distrib/python/grpcio_tools/grpc_version.py
index 657827ea96b..1db4708e067 100644
--- a/tools/distrib/python/grpcio_tools/grpc_version.py
+++ b/tools/distrib/python/grpcio_tools/grpc_version.py
@@ -14,5 +14,5 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/tools/distrib/python/grpcio_tools/grpc_version.py.template`!!!
 
-VERSION = '1.54.0.dev0'
+VERSION = '1.55.0.dev0'
 PROTOBUF_VERSION = '3.21.12'
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index 24856971d77..71394202492 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         = 1.54.0-dev
+PROJECT_NUMBER         = 1.55.0-dev
 
 # 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 bdb366573c7..dbc81740274 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         = 1.54.0-dev
+PROJECT_NUMBER         = 1.55.0-dev
 
 # 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 c86d9a80b72..ac5a795fa0a 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         = 1.54.0-dev
+PROJECT_NUMBER         = 1.55.0-dev
 
 # 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 f61a74a145b..e70d2b15296 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         = 1.54.0-dev
+PROJECT_NUMBER         = 1.55.0-dev
 
 # 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 950dc4644e1..317bbe3a603 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         = 1.54.0-dev
+PROJECT_NUMBER         = 1.55.0-dev
 
 # 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