diff --git a/BUILD b/BUILD
index 49c340d070c..5c400d43b74 100644
--- a/BUILD
+++ b/BUILD
@@ -34,11 +34,11 @@ load(
 )
 
 # This should be updated along with build.yaml
-g_stands_for = "gregarious"
+g_stands_for = "gambit"
 
 core_version = "4.0.0-dev"
 
-version = "1.5.0-dev"
+version = "1.7.0-dev"
 
 GPR_PUBLIC_HDRS = [
     "include/grpc/support/alloc.h",
@@ -593,9 +593,9 @@ grpc_cc_library(
         "src/core/lib/iomgr/ev_windows.c",
         "src/core/lib/iomgr/exec_ctx.c",
         "src/core/lib/iomgr/executor.c",
+        "src/core/lib/iomgr/gethostname_fallback.c",
         "src/core/lib/iomgr/gethostname_host_name_max.c",
         "src/core/lib/iomgr/gethostname_sysconf.c",
-        "src/core/lib/iomgr/gethostname_fallback.c",
         "src/core/lib/iomgr/iocp_windows.c",
         "src/core/lib/iomgr/iomgr.c",
         "src/core/lib/iomgr/iomgr_posix.c",
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8dc4758d238..0b593a9ae5c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,7 +24,7 @@
 cmake_minimum_required(VERSION 2.8)
 
 set(PACKAGE_NAME      "grpc")
-set(PACKAGE_VERSION   "1.5.0-dev")
+set(PACKAGE_VERSION   "1.7.0-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 74f05f592dc..392c8f318fc 100644
--- a/Makefile
+++ b/Makefile
@@ -411,8 +411,8 @@ Q = @
 endif
 
 CORE_VERSION = 4.0.0-dev
-CPP_VERSION = 1.5.0-dev
-CSHARP_VERSION = 1.5.0-dev
+CPP_VERSION = 1.7.0-dev
+CSHARP_VERSION = 1.7.0-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 a459b9d6883..d70bbe39ca8 100644
--- a/build.yaml
+++ b/build.yaml
@@ -13,8 +13,8 @@ settings:
   '#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: 4.0.0-dev
-  g_stands_for: gregarious
-  version: 1.5.0-dev
+  g_stands_for: gambit
+  version: 1.7.0-dev
 filegroups:
 - name: census
   public_headers:
diff --git a/doc/g_stands_for.md b/doc/g_stands_for.md
index 2078bb37ea1..9a161d67a30 100644
--- a/doc/g_stands_for.md
+++ b/doc/g_stands_for.md
@@ -9,3 +9,5 @@ future), and the corresponding version numbers that used them:
 - 1.2 'g' stands for 'green'
 - 1.3 'g' stands for 'gentle'
 - 1.4 'g' stands for 'gregarious'
+- 1.6 'g' stands for 'garcia'
+- 1.7 'g' stands for 'gambit'
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index ffdbd88f157..82cb4bc4167 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -22,7 +22,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-Core'
-  version = '1.5.0-dev'
+  version = '1.7.0-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 2317aacb49b..cb40330dab5 100644
--- a/gRPC-ProtoRPC.podspec
+++ b/gRPC-ProtoRPC.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-ProtoRPC'
-  version = '1.5.0-dev'
+  version = '1.7.0-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 4a03c3fa2f5..52bd8ed0ae1 100644
--- a/gRPC-RxLibrary.podspec
+++ b/gRPC-RxLibrary.podspec
@@ -21,7 +21,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-RxLibrary'
-  version = '1.5.0-dev'
+  version = '1.7.0-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 4c83ccc7a0f..ba90149dd6a 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -20,7 +20,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC'
-  version = '1.5.0-dev'
+  version = '1.7.0-dev'
   s.version  = version
   s.summary  = 'gRPC client library for iOS/OSX'
   s.homepage = 'https://grpc.io'
diff --git a/package.json b/package.json
index b4b16635c66..2e31275bf02 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc",
-  "version": "1.5.0-dev",
+  "version": "1.7.0-dev",
   "author": "Google Inc.",
   "description": "gRPC Library for Node",
   "homepage": "https://grpc.io/",
diff --git a/package.xml b/package.xml
index 4e288b3c682..6e50badfc28 100644
--- a/package.xml
+++ b/package.xml
@@ -13,8 +13,8 @@
  <date>2017-05-22</date>
  <time>16:06:07</time>
  <version>
-  <release>1.5.0dev</release>
-  <api>1.5.0dev</api>
+  <release>1.7.0dev</release>
+  <api>1.7.0dev</api>
  </version>
  <stability>
   <release>beta</release>
diff --git a/src/core/lib/surface/version.c b/src/core/lib/surface/version.c
index 8cef15da80d..96c16105e78 100644
--- a/src/core/lib/surface/version.c
+++ b/src/core/lib/surface/version.c
@@ -23,4 +23,4 @@
 
 const char *grpc_version_string(void) { return "4.0.0-dev"; }
 
-const char *grpc_g_stands_for(void) { return "gregarious"; }
+const char *grpc_g_stands_for(void) { return "gambit"; }
diff --git a/src/cpp/common/version_cc.cc b/src/cpp/common/version_cc.cc
index 34558ea2166..2e9a51316d4 100644
--- a/src/cpp/common/version_cc.cc
+++ b/src/cpp/common/version_cc.cc
@@ -22,5 +22,5 @@
 #include <grpc++/grpc++.h>
 
 namespace grpc {
-grpc::string Version() { return "1.5.0-dev"; }
+grpc::string Version() { return "1.7.0-dev"; }
 }
diff --git a/src/csharp/Grpc.Core/Version.csproj.include b/src/csharp/Grpc.Core/Version.csproj.include
index 81156452f3e..124ecab14cd 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>1.5.0-dev</GrpcCsharpVersion>
+    <GrpcCsharpVersion>1.7.0-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 92aa0e5aede..588cc845165 100644
--- a/src/csharp/Grpc.Core/VersionInfo.cs
+++ b/src/csharp/Grpc.Core/VersionInfo.cs
@@ -33,11 +33,11 @@ namespace Grpc.Core
         /// <summary>
         /// Current <c>AssemblyFileVersion</c> of gRPC C# assemblies
         /// </summary>
-        public const string CurrentAssemblyFileVersion = "1.5.0.0";
+        public const string CurrentAssemblyFileVersion = "1.7.0.0";
 
         /// <summary>
         /// Current version of gRPC C#
         /// </summary>
-        public const string CurrentVersion = "1.5.0-dev";
+        public const string CurrentVersion = "1.7.0-dev";
     }
 }
diff --git a/src/csharp/build_packages_dotnetcli.bat b/src/csharp/build_packages_dotnetcli.bat
index 4e3870d71d4..c419d870492 100755
--- a/src/csharp/build_packages_dotnetcli.bat
+++ b/src/csharp/build_packages_dotnetcli.bat
@@ -13,7 +13,7 @@
 @rem limitations under the License.
 
 @rem Current package versions
-set VERSION=1.5.0-dev
+set VERSION=1.7.0-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 f259cdb1d5c..124dfbb257e 100755
--- a/src/csharp/build_packages_dotnetcli.sh
+++ b/src/csharp/build_packages_dotnetcli.sh
@@ -39,7 +39,7 @@ 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 "1.5.0-dev" -OutputDirectory ../../artifacts
-nuget pack Grpc.Tools.nuspec -Version "1.5.0-dev" -OutputDirectory ../../artifacts
+nuget pack Grpc.nuspec -Version "1.7.0-dev" -OutputDirectory ../../artifacts
+nuget pack Grpc.Tools.nuspec -Version "1.7.0-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 6aa41522cd6..3c7d3707ee0 100644
--- a/src/node/health_check/package.json
+++ b/src/node/health_check/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-health-check",
-  "version": "1.5.0-dev",
+  "version": "1.7.0-dev",
   "author": "Google Inc.",
   "description": "Health check service for use with gRPC",
   "repository": {
@@ -15,7 +15,7 @@
     }
   ],
   "dependencies": {
-    "grpc": "^1.5.0-dev",
+    "grpc": "^1.7.0-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 0a3c32734c5..d9b1fb86c91 100644
--- a/src/node/tools/package.json
+++ b/src/node/tools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-tools",
-  "version": "1.5.0-dev",
+  "version": "1.7.0-dev",
   "author": "Google Inc.",
   "description": "Tools for developing with gRPC on Node.js",
   "homepage": "https://grpc.io/",
diff --git a/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec b/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec
index 345eecc279c..3a282b05269 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 = '1.5.0-dev'
+  v = '1.7.0-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 d9cb3881e12..843954e84a0 100644
--- a/src/objective-c/GRPCClient/private/version.h
+++ b/src/objective-c/GRPCClient/private/version.h
@@ -23,4 +23,4 @@
 // `tools/buildgen/generate_projects.sh`.
 
 
-#define GRPC_OBJC_VERSION_STRING @"1.5.0-dev"
+#define GRPC_OBJC_VERSION_STRING @"1.7.0-dev"
diff --git a/src/php/composer.json b/src/php/composer.json
index c6a74c5c844..3606a18f341 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": "Apache-2.0",
-  "version": "1.5.0",
+  "version": "1.7.0",
   "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 744028b2ca0..07d8eee7fe2 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 "1.5.0dev"
+#define PHP_GRPC_VERSION "1.7.0dev"
 
 #endif /* VERSION_H */
diff --git a/src/python/grpcio/grpc/_grpcio_metadata.py b/src/python/grpcio/grpc/_grpcio_metadata.py
index dcb46459a28..a4eb358c4ee 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__ = """1.5.0.dev0"""
+__version__ = """1.7.0.dev0"""
diff --git a/src/python/grpcio/grpc_version.py b/src/python/grpcio/grpc_version.py
index 1bbd1e149e9..3194a893d7e 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='1.5.0.dev0'
+VERSION='1.7.0.dev0'
diff --git a/src/python/grpcio_health_checking/grpc_version.py b/src/python/grpcio_health_checking/grpc_version.py
index 8aa5118f394..ef68bad17a0 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='1.5.0.dev0'
+VERSION='1.7.0.dev0'
diff --git a/src/python/grpcio_reflection/grpc_version.py b/src/python/grpcio_reflection/grpc_version.py
index a23b9b5edb5..55ab959cc57 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='1.5.0.dev0'
+VERSION='1.7.0.dev0'
diff --git a/src/python/grpcio_tests/grpc_version.py b/src/python/grpcio_tests/grpc_version.py
index fd47b426aca..9e54dc9f75b 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='1.5.0.dev0'
+VERSION='1.7.0.dev0'
diff --git a/src/ruby/lib/grpc/version.rb b/src/ruby/lib/grpc/version.rb
index 0aaf44947aa..228c01a92c4 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 = '1.5.0.dev'
+  VERSION = '1.7.0.dev'
 end
diff --git a/src/ruby/tools/version.rb b/src/ruby/tools/version.rb
index 4c5293241d2..ea0c4ae56cc 100644
--- a/src/ruby/tools/version.rb
+++ b/src/ruby/tools/version.rb
@@ -14,6 +14,6 @@
 
 module GRPC
   module Tools
-    VERSION = '1.5.0.dev'
+    VERSION = '1.7.0.dev'
   end
 end
diff --git a/tools/distrib/python/grpcio_tools/grpc_version.py b/tools/distrib/python/grpcio_tools/grpc_version.py
index 3bad859f7d1..a4178a58c1f 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='1.5.0.dev0'
+VERSION='1.7.0.dev0'
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index 589ef1c328b..b83e581e06a 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         = 1.5.0-dev
+PROJECT_NUMBER         = 1.7.0-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 7290f20c86b..67dfb067aa6 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         = 1.5.0-dev
+PROJECT_NUMBER         = 1.7.0-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