diff --git a/BUILD b/BUILD
index 12bd026c95117a27f54b255748bd86e82ec812d1..54f50c078383cc10fc8a781da31c2ed6868a58f4 100644
--- a/BUILD
+++ b/BUILD
@@ -42,7 +42,7 @@ g_stands_for = "gentle"
 
 core_version = "3.0.0-dev"
 
-version = "1.3.0-dev"
+version = "1.4.0-dev"
 
 grpc_cc_library(
     name = "gpr",
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d3db20d4203d83189f5d2892fff997653468a2fa..ef8b45a394b0494022ba250eb2646699d7b2b5c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,7 +39,7 @@
 cmake_minimum_required(VERSION 2.8)
 
 set(PACKAGE_NAME      "grpc")
-set(PACKAGE_VERSION   "1.3.0-dev")
+set(PACKAGE_VERSION   "1.4.0-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 8c26b2e910a6cd3e7babed92f5db089e96969665..223291467b345fbea96598dea8896dd2763d570d 100644
--- a/Makefile
+++ b/Makefile
@@ -420,8 +420,8 @@ Q = @
 endif
 
 CORE_VERSION = 3.0.0-dev
-CPP_VERSION = 1.3.0-dev
-CSHARP_VERSION = 1.3.0-dev
+CPP_VERSION = 1.4.0-dev
+CSHARP_VERSION = 1.4.0-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 7db01506302001cb6082a6a6c7f3ae3a2d5c815f..63985cda1475942279a19a7c17a65b768f02e6f5 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: 3.0.0-dev
   g_stands_for: gentle
-  version: 1.3.0-dev
+  version: 1.4.0-dev
 filegroups:
 - name: census
   public_headers:
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index aed17ae9c3dcf2a6c8976ec1dff7a5c537b7d13b..af8363833689e5e0406d0493ccc9b1c7c8cf0d0a 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -37,7 +37,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-Core'
-  version = '1.3.0-dev'
+  version = '1.4.0-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 1940015782eac50bed8010c957dda0237235ecb2..62cb0d11a1c9e8c55980f296153973dd32775fb7 100644
--- a/gRPC-ProtoRPC.podspec
+++ b/gRPC-ProtoRPC.podspec
@@ -36,7 +36,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-ProtoRPC'
-  version = '1.3.0-dev'
+  version = '1.4.0-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 841a85336333185e3f6a1fe9437e35c8cbe5b183..77ceb22123c5746df403ea3bcf233ec4ccb2c0ef 100644
--- a/gRPC-RxLibrary.podspec
+++ b/gRPC-RxLibrary.podspec
@@ -36,7 +36,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-RxLibrary'
-  version = '1.3.0-dev'
+  version = '1.4.0-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 08ea79118d1a03a78301e367545f5b22d13e7793..10520bd3880edb2e05e9397d04f63f26c0bc62d2 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -35,7 +35,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC'
-  version = '1.3.0-dev'
+  version = '1.4.0-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 7f242326d7ecd03feacb76126aa7defa87d18579..6a01ae23243f086981ee025cfbb73d5ca48009f7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc",
-  "version": "1.3.0-dev",
+  "version": "1.4.0-dev",
   "author": "Google Inc.",
   "description": "gRPC Library for Node",
   "homepage": "http://www.grpc.io/",
diff --git a/package.xml b/package.xml
index 57e50725e8eb71b92c7d1d9a221ea88d75d6502a..d2eb2512ecd091774b56391abc4c8e9a6666e5ca 100644
--- a/package.xml
+++ b/package.xml
@@ -13,8 +13,8 @@
  <date>2017-03-01</date>
  <time>16:06:07</time>
  <version>
-  <release>1.3.0dev</release>
-  <api>1.3.0dev</api>
+  <release>1.4.0dev</release>
+  <api>1.4.0dev</api>
  </version>
  <stability>
   <release>beta</release>
diff --git a/src/cpp/common/version_cc.cc b/src/cpp/common/version_cc.cc
index f5a0e4131de418d88f6a06e26fec1e1c128a74fb..72a4c4cf94a2753f108835ba6cb35e5f400998f9 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 "1.3.0-dev"; }
+grpc::string Version() { return "1.4.0-dev"; }
 }
diff --git a/src/csharp/Grpc.Core/Version.csproj.include b/src/csharp/Grpc.Core/Version.csproj.include
index ce9d0d2d5d287f616bda2ccdee308683e301ee22..6af2af10bd00cc6d67c0ff88968acfc6b61c2d01 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>1.3.0-dev</GrpcCsharpVersion>
+    <GrpcCsharpVersion>1.4.0-dev</GrpcCsharpVersion>
     <GoogleProtobufVersion>3.2.0</GoogleProtobufVersion>
   </PropertyGroup>
 </Project>
diff --git a/src/csharp/Grpc.Core/VersionInfo.cs b/src/csharp/Grpc.Core/VersionInfo.cs
index 6012d904b69ee0697b2739ffe63e05faa27ef64d..2e55d9d80eb45365b732c8995efe181670d9b653 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 = "1.3.0.0";
+        public const string CurrentAssemblyFileVersion = "1.4.0.0";
 
         /// <summary>
         /// Current version of gRPC C#
         /// </summary>
-        public const string CurrentVersion = "1.3.0-dev";
+        public const string CurrentVersion = "1.4.0-dev";
     }
 }
diff --git a/src/csharp/build_packages_dotnetcli.bat b/src/csharp/build_packages_dotnetcli.bat
index 7558ca60c71794d4435a1a1b01464566b4f09a35..673642e3d8714710ea10993101f2145d97f41399 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=1.3.0-dev
+set VERSION=1.4.0-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 2186bd3c56805607343aa13cc753cab2be428658..ee923e3d870b5edeb7193eeb0ba787790fef0703 100755
--- a/src/csharp/build_packages_dotnetcli.sh
+++ b/src/csharp/build_packages_dotnetcli.sh
@@ -70,7 +70,7 @@ 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 "1.3.0-dev" -OutputDirectory ../../artifacts
-nuget pack Grpc.Tools.nuspec -Version "1.3.0-dev" -OutputDirectory ../../artifacts
+nuget pack Grpc.nuspec -Version "1.4.0-dev" -OutputDirectory ../../artifacts
+nuget pack Grpc.Tools.nuspec -Version "1.4.0-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 e218f5a4063dc34b46b4d9bd7c20544c55bd9b5c..37c9b7a54f5fd0f381937b860f16e54a77d32ae0 100644
--- a/src/node/health_check/package.json
+++ b/src/node/health_check/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-health-check",
-  "version": "1.3.0-dev",
+  "version": "1.4.0-dev",
   "author": "Google Inc.",
   "description": "Health check service for use with gRPC",
   "repository": {
@@ -15,7 +15,7 @@
     }
   ],
   "dependencies": {
-    "grpc": "^1.3.0-dev",
+    "grpc": "^1.4.0-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 3096c6e42a8fcd6a0ffb442fbd8b9947baa108d4..a81aa87f4bb7708a6582fae4607a1c5b058f7e01 100644
--- a/src/node/tools/package.json
+++ b/src/node/tools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-tools",
-  "version": "1.3.0-dev",
+  "version": "1.4.0-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 2f41ad196a651f50fb35544f8e23b8c73c2fef1a..2f29058b59d4b721e1a3958c7acca9723a2f7413 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 = '1.3.0-dev'
+  v = '1.4.0-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 09155ee4d40afab42c113e7c9f2270979b3719b2..c846f4214c968a4f67f75d38238b967d7338424c 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 @"1.3.0-dev"
+#define GRPC_OBJC_VERSION_STRING @"1.4.0-dev"
diff --git a/src/php/composer.json b/src/php/composer.json
index 2b140077cc5ed9ddbb4e508d6bce036b8b161f6f..24c17c3b572dacf45772a44005d11a71a09cda1e 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": "1.3.0",
+  "version": "1.4.0",
   "require": {
     "php": ">=5.5.0",
     "google/protobuf": "^v3.1.0"
diff --git a/src/python/grpcio/grpc_version.py b/src/python/grpcio/grpc_version.py
index 267d848e74377e8d036915a7fb2122fbde598601..ea4bc7ba207d856818fc418a43d8488245d5f1f4 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='1.3.0.dev0'
+VERSION='1.4.0.dev0'
diff --git a/src/python/grpcio_health_checking/grpc_version.py b/src/python/grpcio_health_checking/grpc_version.py
index 4ff5e266a1f4f1becb827368196562d2dcdaedff..26aa555e14cf9b2257214624a9f3bcb83c77a668 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='1.3.0.dev0'
+VERSION='1.4.0.dev0'
diff --git a/src/python/grpcio_reflection/grpc_version.py b/src/python/grpcio_reflection/grpc_version.py
index 8ffc08c04b8f72ebbc771f7bb153fcc31b5f096e..978d6b4011f76ac41a5d3f17bb88c6680acb30dc 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='1.3.0.dev0'
+VERSION='1.4.0.dev0'
diff --git a/src/python/grpcio_tests/grpc_version.py b/src/python/grpcio_tests/grpc_version.py
index ba82dce6f6d2ae8e168370aa4f4385606e54942a..5f0b084884649fea2bd4d0fee6d92d6bdda4e9c5 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='1.3.0.dev0'
+VERSION='1.4.0.dev0'
diff --git a/src/ruby/lib/grpc/version.rb b/src/ruby/lib/grpc/version.rb
index 9901158e735daae3d90616247754933bdff569dc..f30dff335f1af4606a0b3cb37581beb67dcf9148 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 = '1.3.0.dev'
+  VERSION = '1.4.0.dev'
 end
diff --git a/src/ruby/tools/version.rb b/src/ruby/tools/version.rb
index 632c0100bd842cef6ddffb978e9c7ebb36d0e466..1f8d4afb95f2fcfe4da299292e1aaf1ef4af7501 100644
--- a/src/ruby/tools/version.rb
+++ b/src/ruby/tools/version.rb
@@ -29,6 +29,6 @@
 
 module GRPC
   module Tools
-    VERSION = '1.3.0.dev'
+    VERSION = '1.4.0.dev'
   end
 end
diff --git a/tools/distrib/python/grpcio_tools/grpc_version.py b/tools/distrib/python/grpcio_tools/grpc_version.py
index ad35b90bad3743f0afc81df80abfd22732d3242d..1f2aa81c850aaa782cee069c0ceea02b7c12b463 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='1.3.0.dev0'
+VERSION='1.4.0.dev0'
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index 59e619749a88a24c24d63be365b1021f973a3a91..1864dd9e908404a8e66f8a9ffc05d51a545a9250 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         = 1.3.0-dev
+PROJECT_NUMBER         = 1.4.0-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 afab2296a020424e7cf0ed42a5c216d10fa692bf..0ab0804488b8b4681001601838869d514838c2cf 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         = 1.3.0-dev
+PROJECT_NUMBER         = 1.4.0-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