diff --git a/BUILD b/BUILD
index f3dfcada61f..e1887222ba4 100644
--- a/BUILD
+++ b/BUILD
@@ -229,7 +229,7 @@ python_config_settings()
 # This should be updated along with build_handwritten.yaml
 g_stands_for = "gladiator"  # @unused
 
-core_version = "42.0.0"  # @unused
+core_version = "43.0.0"  # @unused
 
 version = "1.66.0-dev"  # @unused
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index df391302651..69310446bdc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,8 +26,8 @@ cmake_minimum_required(VERSION 3.13)
 
 set(PACKAGE_NAME          "grpc")
 set(PACKAGE_VERSION       "1.66.0-dev")
-set(gRPC_CORE_VERSION     "42.0.0")
-set(gRPC_CORE_SOVERSION   "42")
+set(gRPC_CORE_VERSION     "43.0.0")
+set(gRPC_CORE_SOVERSION   "43")
 set(gRPC_CPP_VERSION      "1.66.0-dev")
 set(gRPC_CPP_SOVERSION    "1.66")
 set(PACKAGE_STRING        "${PACKAGE_NAME} ${PACKAGE_VERSION}")
diff --git a/Makefile b/Makefile
index 8db5503b558..6874598428e 100644
--- a/Makefile
+++ b/Makefile
@@ -367,7 +367,7 @@ E = @echo
 Q = @
 endif
 
-CORE_VERSION = 42.0.0
+CORE_VERSION = 43.0.0
 CPP_VERSION = 1.66.0-dev
 
 CPPFLAGS_NO_ARCH += $(addprefix -I, $(INCLUDES)) $(addprefix -D, $(DEFINES))
@@ -404,7 +404,7 @@ SHARED_EXT_CORE = dll
 SHARED_EXT_CPP = dll
 
 SHARED_PREFIX =
-SHARED_VERSION_CORE = -42
+SHARED_VERSION_CORE = -43
 SHARED_VERSION_CPP = -1
 else ifeq ($(SYSTEM),Darwin)
 EXECUTABLE_SUFFIX =
@@ -1843,8 +1843,8 @@ $(LIBDIR)/$(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)/libcares.a $(OPENSSL_MERGE_LIBS) $(ZLIB_MERGE_LIBS) $(LDLIBS_SECURE) $(LDLIBS)
 else
-	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc.so.42 -o $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_OBJS) $(LIBDIR)/$(CONFIG)/libcares.a $(OPENSSL_MERGE_LIBS) $(ZLIB_MERGE_LIBS) $(LDLIBS_SECURE) $(LDLIBS)
-	$(Q) ln -sf $(SHARED_PREFIX)grpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).so.42
+	$(Q) $(LDXX) $(LDFLAGS) -L$(LIBDIR)/$(CONFIG) -shared -Wl,-soname,libgrpc.so.43 -o $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBGRPC_OBJS) $(LIBDIR)/$(CONFIG)/libcares.a $(OPENSSL_MERGE_LIBS) $(ZLIB_MERGE_LIBS) $(LDLIBS_SECURE) $(LDLIBS)
+	$(Q) ln -sf $(SHARED_PREFIX)grpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).so.43
 	$(Q) ln -sf $(SHARED_PREFIX)grpc$(SHARED_VERSION_CORE).$(SHARED_EXT_CORE) $(LIBDIR)/$(CONFIG)/libgrpc$(SHARED_VERSION_CORE).so
 endif
 endif
diff --git a/build_config.rb b/build_config.rb
index 549196641f9..2524b03b765 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-42.dll'
+  CORE_WINDOWS_DLL = '/tmp/libs/opt/grpc-43.dll'
 end
diff --git a/build_handwritten.yaml b/build_handwritten.yaml
index 5ea09b75290..de90b687e8d 100644
--- a/build_handwritten.yaml
+++ b/build_handwritten.yaml
@@ -12,7 +12,7 @@ settings:
   '#08': Use "-preN" suffixes to identify pre-release versions
   '#09': Per-language overrides are possible with (eg) ruby_version tag here
   '#10': See the expand_version.py for all the quirks here
-  core_version: 42.0.0
+  core_version: 43.0.0
   csharp_major_version: 2
   g_stands_for: gladiator
   protobuf_version: 3.27.2
diff --git a/src/core/lib/surface/version.cc b/src/core/lib/surface/version.cc
index a24a26ba4bf..9fa920a3b3e 100644
--- a/src/core/lib/surface/version.cc
+++ b/src/core/lib/surface/version.cc
@@ -22,6 +22,6 @@
 #include <grpc/grpc.h>
 #include <grpc/support/port_platform.h>
 
-const char* grpc_version_string(void) { return "42.0.0"; }
+const char* grpc_version_string(void) { return "43.0.0"; }
 
 const char* grpc_g_stands_for(void) { return "gladiator"; }
diff --git a/src/objective-c/tests/version.h b/src/objective-c/tests/version.h
index b79755fb413..aba60d1d33a 100644
--- a/src/objective-c/tests/version.h
+++ b/src/objective-c/tests/version.h
@@ -23,4 +23,4 @@
 // `tools/buildgen/generate_projects.sh`.
 
 #define GRPC_OBJC_VERSION_STRING @"1.66.0-dev"
-#define GRPC_C_VERSION_STRING @"42.0.0"
+#define GRPC_C_VERSION_STRING @"43.0.0"
diff --git a/tools/doxygen/Doxyfile.core b/tools/doxygen/Doxyfile.core
index 3242f05f88b..9748cec3244 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         = 42.0.0
+PROJECT_NUMBER         = 43.0.0
 
 # 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 e345629f04f..f2df91ec3c9 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         = 42.0.0
+PROJECT_NUMBER         = 43.0.0
 
 # 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