diff --git a/BUILD b/BUILD
index bdea522ad15f97e0adb1eb111478246a388bb12d..d3a77808ea18892fb012171c0013f22b2a202897 100644
--- a/BUILD
+++ b/BUILD
@@ -51,9 +51,9 @@ load(
 # This should be updated along with build.yaml
 g_stands_for = "gregarious"
 
-core_version = "3.0.0-dev"
+core_version = "4.0.0-dev"
 
-version = "1.4.0-dev"
+version = "1.5.0-dev"
 
 grpc_cc_library(
     name = "gpr",
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fd53f621a65fdf4808e620f7f6b75857d0748524..11c6b047888fb015d30769cfc0fd4ab036b8cd70 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,7 +39,7 @@
 cmake_minimum_required(VERSION 2.8)
 
 set(PACKAGE_NAME      "grpc")
-set(PACKAGE_VERSION   "1.4.0-dev")
+set(PACKAGE_VERSION   "1.5.0-dev")
 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 82b2104b4a7e1db8e5c34a6492bcc25c264eb040..5e29711fb18a97090b04dd413bf20dd7c3b71eff 100644
--- a/Makefile
+++ b/Makefile
@@ -423,8 +423,8 @@ Q = @
 endif
 
 CORE_VERSION = 4.0.0-dev
-CPP_VERSION = 1.4.0-dev
-CSHARP_VERSION = 1.4.0-dev
+CPP_VERSION = 1.5.0-dev
+CSHARP_VERSION = 1.5.0-dev
 
 CPPFLAGS_NO_ARCH += $(addprefix -I, $(INCLUDES)) $(addprefix -D, $(DEFINES))
 CPPFLAGS += $(CPPFLAGS_NO_ARCH) $(ARCH_FLAGS)
diff --git a/build.yaml b/build.yaml
index 26144e33def476d59621b41f1835fbf726a59cc7..d1e61256e6e19fdd6712cafc18b00d2ab138654d 100644
--- a/build.yaml
+++ b/build.yaml
@@ -14,7 +14,7 @@ settings:
   '#10': See the expand_version.py for all the quirks here
   core_version: 4.0.0-dev
   g_stands_for: gregarious
-  version: 1.4.0-dev
+  version: 1.5.0-dev
 filegroups:
 - name: census
   public_headers:
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index d9de2d78a051947bdaf06bd7e86b47138f48c80a..e5e61df477f505b61c5b0998408532d4565e4bc8 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -37,7 +37,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-Core'
-  version = '1.4.0-dev'
+  version = '1.5.0-dev'
   s.version  = version
   s.summary  = 'Core cross-platform gRPC library, written in C'
   s.homepage = 'http://www.grpc.io'
diff --git a/gRPC-ProtoRPC.podspec b/gRPC-ProtoRPC.podspec
index 62cb0d11a1c9e8c55980f296153973dd32775fb7..6baef2888558caa6dc049178d7ff80fc646562a0 100644
--- a/gRPC-ProtoRPC.podspec
+++ b/gRPC-ProtoRPC.podspec
@@ -36,7 +36,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-ProtoRPC'
-  version = '1.4.0-dev'
+  version = '1.5.0-dev'
   s.version  = version
   s.summary  = 'RPC library for Protocol Buffers, based on gRPC'
   s.homepage = 'http://www.grpc.io'
diff --git a/gRPC-RxLibrary.podspec b/gRPC-RxLibrary.podspec
index 77ceb22123c5746df403ea3bcf233ec4ccb2c0ef..dfccc5d16c4a44781f13743e72bbfef7b525885b 100644
--- a/gRPC-RxLibrary.podspec
+++ b/gRPC-RxLibrary.podspec
@@ -36,7 +36,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-RxLibrary'
-  version = '1.4.0-dev'
+  version = '1.5.0-dev'
   s.version  = version
   s.summary  = 'Reactive Extensions library for iOS/OSX.'
   s.homepage = 'http://www.grpc.io'
diff --git a/gRPC.podspec b/gRPC.podspec
index 10520bd3880edb2e05e9397d04f63f26c0bc62d2..7f4886ab656577d04ab03aa5a67dad01a90fdba8 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -35,7 +35,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC'
-  version = '1.4.0-dev'
+  version = '1.5.0-dev'
   s.version  = version
   s.summary  = 'gRPC client library for iOS/OSX'
   s.homepage = 'http://www.grpc.io'
diff --git a/package.json b/package.json
index 1ed182ced93c4ff64998acb18f0d75658ee43631..a0d76c435b6654524488992c2bc7d7a967e2f533 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc",
-  "version": "1.4.0-dev",
+  "version": "1.5.0-dev",
   "author": "Google Inc.",
   "description": "gRPC Library for Node",
   "homepage": "http://www.grpc.io/",
diff --git a/package.xml b/package.xml
index 9179ef238c9fbaa84f13429626cced982165eb5e..817a0345d60bc5c0c74a0ef37090e90e91d40344 100644
--- a/package.xml
+++ b/package.xml
@@ -13,8 +13,8 @@
  <date>2017-05-22</date>
  <time>16:06:07</time>
  <version>
-  <release>1.4.0dev</release>
-  <api>1.4.0dev</api>
+  <release>1.5.0dev</release>
+  <api>1.5.0dev</api>
  </version>
  <stability>
   <release>beta</release>
diff --git a/src/cpp/common/version_cc.cc b/src/cpp/common/version_cc.cc
index 72a4c4cf94a2753f108835ba6cb35e5f400998f9..e4f5cb8422e3050d790b9e6f4e96907e465a728f 100644
--- a/src/cpp/common/version_cc.cc
+++ b/src/cpp/common/version_cc.cc
@@ -37,5 +37,5 @@
 #include <grpc++/grpc++.h>
 
 namespace grpc {
-grpc::string Version() { return "1.4.0-dev"; }
+grpc::string Version() { return "1.5.0-dev"; }
 }
diff --git a/src/csharp/Grpc.Core/Version.csproj.include b/src/csharp/Grpc.Core/Version.csproj.include
index 8388bfd9cca5d8db703d06b0455da62985622d84..81156452f3e0d02167d300348e718048e312c17d 100755
--- a/src/csharp/Grpc.Core/Version.csproj.include
+++ b/src/csharp/Grpc.Core/Version.csproj.include
@@ -1,7 +1,7 @@
 <!-- This file is generated -->
 <Project>
   <PropertyGroup>
-    <GrpcCsharpVersion>1.4.0-dev</GrpcCsharpVersion>
+    <GrpcCsharpVersion>1.5.0-dev</GrpcCsharpVersion>
     <GoogleProtobufVersion>3.3.0</GoogleProtobufVersion>
   </PropertyGroup>
 </Project>
diff --git a/src/csharp/Grpc.Core/VersionInfo.cs b/src/csharp/Grpc.Core/VersionInfo.cs
index 2e55d9d80eb45365b732c8995efe181670d9b653..d507878c2df201cbe49671d26e2b5eba38bcf506 100644
--- a/src/csharp/Grpc.Core/VersionInfo.cs
+++ b/src/csharp/Grpc.Core/VersionInfo.cs
@@ -48,11 +48,11 @@ namespace Grpc.Core
         /// <summary>
         /// Current <c>AssemblyFileVersion</c> of gRPC C# assemblies
         /// </summary>
-        public const string CurrentAssemblyFileVersion = "1.4.0.0";
+        public const string CurrentAssemblyFileVersion = "1.5.0.0";
 
         /// <summary>
         /// Current version of gRPC C#
         /// </summary>
-        public const string CurrentVersion = "1.4.0-dev";
+        public const string CurrentVersion = "1.5.0-dev";
     }
 }
diff --git a/src/csharp/build_packages_dotnetcli.bat b/src/csharp/build_packages_dotnetcli.bat
index aa8a8d3b17b926c6fcbd969cf88e77d809e90864..35664cc762d9fdb263713594f870b32e557c4578 100755
--- a/src/csharp/build_packages_dotnetcli.bat
+++ b/src/csharp/build_packages_dotnetcli.bat
@@ -28,7 +28,7 @@
 @rem OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 @rem Current package versions
-set VERSION=1.4.0-dev
+set VERSION=1.5.0-dev
 
 @rem Adjust the location of nuget.exe
 set NUGET=C:\nuget\nuget.exe
diff --git a/src/csharp/build_packages_dotnetcli.sh b/src/csharp/build_packages_dotnetcli.sh
index d33923845c161848051cd76b6ed5419ef07f9ce3..7dc07a220df4988c62bb27a63d3d5342ec059523 100755
--- a/src/csharp/build_packages_dotnetcli.sh
+++ b/src/csharp/build_packages_dotnetcli.sh
@@ -54,7 +54,7 @@ dotnet pack --configuration Release Grpc.Auth --output ../../../artifacts
 dotnet pack --configuration Release Grpc.HealthCheck --output ../../../artifacts
 dotnet pack --configuration Release Grpc.Reflection --output ../../../artifacts
 
-nuget pack Grpc.nuspec -Version "1.4.0-dev" -OutputDirectory ../../artifacts
-nuget pack Grpc.Tools.nuspec -Version "1.4.0-dev" -OutputDirectory ../../artifacts
+nuget pack Grpc.nuspec -Version "1.5.0-dev" -OutputDirectory ../../artifacts
+nuget pack Grpc.Tools.nuspec -Version "1.5.0-dev" -OutputDirectory ../../artifacts
 
 (cd ../../artifacts && zip csharp_nugets_dotnetcli.zip *.nupkg)
diff --git a/src/node/health_check/package.json b/src/node/health_check/package.json
index 37c9b7a54f5fd0f381937b860f16e54a77d32ae0..0922f54a3944d6ca5592ffe04633a350f006b39f 100644
--- a/src/node/health_check/package.json
+++ b/src/node/health_check/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-health-check",
-  "version": "1.4.0-dev",
+  "version": "1.5.0-dev",
   "author": "Google Inc.",
   "description": "Health check service for use with gRPC",
   "repository": {
@@ -15,7 +15,7 @@
     }
   ],
   "dependencies": {
-    "grpc": "^1.4.0-dev",
+    "grpc": "^1.5.0-dev",
     "lodash": "^3.9.3",
     "google-protobuf": "^3.0.0"
   },
diff --git a/src/node/tools/package.json b/src/node/tools/package.json
index a81aa87f4bb7708a6582fae4607a1c5b058f7e01..542d52d48bc32cf1840b16c475c4b52d6021b2cd 100644
--- a/src/node/tools/package.json
+++ b/src/node/tools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-tools",
-  "version": "1.4.0-dev",
+  "version": "1.5.0-dev",
   "author": "Google Inc.",
   "description": "Tools for developing with gRPC on Node.js",
   "homepage": "http://www.grpc.io/",
diff --git a/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec b/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec
index 2f29058b59d4b721e1a3958c7acca9723a2f7413..711814e7fa9949616552f1f65d200f6bc3b72620 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 = '1.4.0-dev'
+  v = '1.5.0-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/private/version.h b/src/objective-c/GRPCClient/private/version.h
index c846f4214c968a4f67f75d38238b967d7338424c..cacbce464486e604f4ab57a59d0eb9665a0f6559 100644
--- a/src/objective-c/GRPCClient/private/version.h
+++ b/src/objective-c/GRPCClient/private/version.h
@@ -38,4 +38,4 @@
 // `tools/buildgen/generate_projects.sh`.
 
 
-#define GRPC_OBJC_VERSION_STRING @"1.4.0-dev"
+#define GRPC_OBJC_VERSION_STRING @"1.5.0-dev"
diff --git a/src/php/composer.json b/src/php/composer.json
index a4fba7e4f6a888a963e4ccbc689c02057022fc85..3a97e5fb4142b3501a55a8452687f0e9847744f7 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 Developement use only",
   "license": "BSD-3-Clause",
-  "version": "1.4.0",
+  "version": "1.5.0",
   "require": {
     "php": ">=5.5.0",
     "google/protobuf": "^v3.3.0"
diff --git a/src/php/ext/grpc/version.h b/src/php/ext/grpc/version.h
index 993ef2de27419e09539d2007f39766b6890ce7aa..303a63ec3640c0619050f65702f9d52d13ff3ba9 100644
--- a/src/php/ext/grpc/version.h
+++ b/src/php/ext/grpc/version.h
@@ -35,6 +35,6 @@
 #ifndef VERSION_H
 #define VERSION_H
 
-#define PHP_GRPC_VERSION "1.4.0"
+#define PHP_GRPC_VERSION "1.5.0"
 
 #endif /* VERSION_H */
diff --git a/src/python/grpcio/grpc/_grpcio_metadata.py b/src/python/grpcio/grpc/_grpcio_metadata.py
index a0cb0dd067f1eb68790e1908a17cf257fae609c3..3ae2602d20c2b3d54f2431dffbbc4c28c0be2527 100644
--- a/src/python/grpcio/grpc/_grpcio_metadata.py
+++ b/src/python/grpcio/grpc/_grpcio_metadata.py
@@ -29,4 +29,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio/grpc/_grpcio_metadata.py.template`!!!
 
-__version__ = """1.4.0.dev0"""
+__version__ = """1.5.0.dev0"""
diff --git a/src/python/grpcio/grpc_version.py b/src/python/grpcio/grpc_version.py
index ea4bc7ba207d856818fc418a43d8488245d5f1f4..f5bd29ff85c740c51984d38fe6a8bb3b84941b2f 100644
--- a/src/python/grpcio/grpc_version.py
+++ b/src/python/grpcio/grpc_version.py
@@ -29,4 +29,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio/grpc_version.py.template`!!!
 
-VERSION='1.4.0.dev0'
+VERSION='1.5.0.dev0'
diff --git a/src/python/grpcio_health_checking/grpc_version.py b/src/python/grpcio_health_checking/grpc_version.py
index 26aa555e14cf9b2257214624a9f3bcb83c77a668..26a830188398a447a7c64927dcc45fcdf384b3fe 100644
--- a/src/python/grpcio_health_checking/grpc_version.py
+++ b/src/python/grpcio_health_checking/grpc_version.py
@@ -29,4 +29,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_health_checking/grpc_version.py.template`!!!
 
-VERSION='1.4.0.dev0'
+VERSION='1.5.0.dev0'
diff --git a/src/python/grpcio_reflection/grpc_version.py b/src/python/grpcio_reflection/grpc_version.py
index 978d6b4011f76ac41a5d3f17bb88c6680acb30dc..f16737df80a9950d75fee6e793525c7e2ddf22bf 100644
--- a/src/python/grpcio_reflection/grpc_version.py
+++ b/src/python/grpcio_reflection/grpc_version.py
@@ -29,4 +29,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_reflection/grpc_version.py.template`!!!
 
-VERSION='1.4.0.dev0'
+VERSION='1.5.0.dev0'
diff --git a/src/python/grpcio_tests/grpc_version.py b/src/python/grpcio_tests/grpc_version.py
index 5f0b084884649fea2bd4d0fee6d92d6bdda4e9c5..28cf8a8a628cbaa45fb8c54b11a08f0c44db4655 100644
--- a/src/python/grpcio_tests/grpc_version.py
+++ b/src/python/grpcio_tests/grpc_version.py
@@ -29,4 +29,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio_tests/grpc_version.py.template`!!!
 
-VERSION='1.4.0.dev0'
+VERSION='1.5.0.dev0'
diff --git a/src/ruby/lib/grpc/version.rb b/src/ruby/lib/grpc/version.rb
index f30dff335f1af4606a0b3cb37581beb67dcf9148..e2e784d19f2916265a72824cc89c63768fe3d6d7 100644
--- a/src/ruby/lib/grpc/version.rb
+++ b/src/ruby/lib/grpc/version.rb
@@ -29,5 +29,5 @@
 
 # GRPC contains the General RPC module.
 module GRPC
-  VERSION = '1.4.0.dev'
+  VERSION = '1.5.0.dev'
 end
diff --git a/src/ruby/tools/version.rb b/src/ruby/tools/version.rb
index 1f8d4afb95f2fcfe4da299292e1aaf1ef4af7501..4f74238df798ff60f42df39db09705588b263591 100644
--- a/src/ruby/tools/version.rb
+++ b/src/ruby/tools/version.rb
@@ -29,6 +29,6 @@
 
 module GRPC
   module Tools
-    VERSION = '1.4.0.dev'
+    VERSION = '1.5.0.dev'
   end
 end
diff --git a/tools/distrib/python/grpcio_tools/grpc_version.py b/tools/distrib/python/grpcio_tools/grpc_version.py
index 1f2aa81c850aaa782cee069c0ceea02b7c12b463..417722a4d24c9d317e36482e4fa55e1f7f4c2c3f 100644
--- a/tools/distrib/python/grpcio_tools/grpc_version.py
+++ b/tools/distrib/python/grpcio_tools/grpc_version.py
@@ -29,4 +29,4 @@
 
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/tools/distrib/python/grpcio_tools/grpc_version.py.template`!!!
 
-VERSION='1.4.0.dev0'
+VERSION='1.5.0.dev0'
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index 3861bdb85af0ed21fddaa79ada3a85e64c96ae26..23746de1aa5413e9b91cfd9952d54935210a0cba 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         = 1.4.0-dev
+PROJECT_NUMBER         = 1.5.0-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 5bab66c7d6ad6d3492081f08c5d491407f85466d..52e722f56c9a30f134166918c6e7de82d8db9dc3 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         = 1.4.0-dev
+PROJECT_NUMBER         = 1.5.0-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