diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6c3392a8751122fad77cb6e4427798df1f064382..44e90720a5d78aead48bec3ba92a95c33a891210 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,7 +42,7 @@
 cmake_minimum_required(VERSION 2.8)
 
 set(PACKAGE_NAME      "grpc")
-set(PACKAGE_VERSION   "1.0.0")
+set(PACKAGE_VERSION   "1.0.1-pre1")
 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 eb0e216bc7297b19cc5a771932ade97a9a0b051c..da53211281c4de22985b0807278c2c987a0e1925 100644
--- a/Makefile
+++ b/Makefile
@@ -415,7 +415,7 @@ E = @echo
 Q = @
 endif
 
-VERSION = 1.0.0
+VERSION = 1.0.1-pre1
 
 CPPFLAGS_NO_ARCH += $(addprefix -I, $(INCLUDES)) $(addprefix -D, $(DEFINES))
 CPPFLAGS += $(CPPFLAGS_NO_ARCH) $(ARCH_FLAGS)
diff --git a/build.yaml b/build.yaml
index 34f67eefa3e341793f9c5f9abfe32dac38de7ce9..8377c655455044521ea4b4bec84615e684259d9b 100644
--- a/build.yaml
+++ b/build.yaml
@@ -7,7 +7,7 @@ settings:
   '#3': Use "-preN" suffixes to identify pre-release versions
   '#4': Per-language overrides are possible with (eg) ruby_version tag here
   '#5': See the expand_version.py for all the quirks here
-  version: 1.0.0
+  version: 1.0.1-pre1
 filegroups:
 - name: census
   public_headers:
diff --git a/package.json b/package.json
index 1de4e3ede5130bd3388984acf7d77f3cbf1204be..3f2f3f1873fbb75d404e9d37f2ad17670fda13a5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc",
-  "version": "1.0.0",
+  "version": "1.0.1-pre1",
   "author": "Google Inc.",
   "description": "gRPC Library for Node",
   "homepage": "http://www.grpc.io/",
diff --git a/package.xml b/package.xml
index 21f821732f6fc6298fae21f1a9cfe6ef3cc2d5d7..81aa5b2823780c57a5f34ad7ac52e52145b2bfa5 100644
--- a/package.xml
+++ b/package.xml
@@ -13,8 +13,8 @@
  <date>2016-08-09</date>
  <time>16:06:07</time>
  <version>
-  <release>1.0.0</release>
-  <api>1.0.0</api>
+  <release>1.0.1</release>
+  <api>1.0.1</api>
  </version>
  <stability>
   <release>stable</release>
diff --git a/src/core/lib/surface/version.c b/src/core/lib/surface/version.c
index 126cac839dd8e4b5e3975bbd7b997d734d6e3a8e..9463436ada5228d08319b64d3bf173d71079ee7d 100644
--- a/src/core/lib/surface/version.c
+++ b/src/core/lib/surface/version.c
@@ -36,4 +36,4 @@
 
 #include <grpc/grpc.h>
 
-const char *grpc_version_string(void) { return "1.0.0"; }
+const char *grpc_version_string(void) { return "1.0.1-pre1"; }
diff --git a/src/csharp/Grpc.Auth/project.json b/src/csharp/Grpc.Auth/project.json
index bb128789df0565cd9dfd6164600612a3f5996392..fce8b596a36d3bda874659c0623d630b7c5ad974 100644
--- a/src/csharp/Grpc.Auth/project.json
+++ b/src/csharp/Grpc.Auth/project.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.0.0",
+  "version": "1.0.1-pre1",
   "title": "gRPC C# Auth",
   "authors": [ "Google Inc." ],
   "copyright": "Copyright 2015, Google Inc.",
@@ -22,7 +22,7 @@
     }
   },
   "dependencies": {
-    "Grpc.Core": "1.0.0",
+    "Grpc.Core": "1.0.1-pre1",
     "Google.Apis.Auth": "1.15.0"
   },
   "frameworks": {
diff --git a/src/csharp/Grpc.Core/VersionInfo.cs b/src/csharp/Grpc.Core/VersionInfo.cs
index 74969178594b56e9e3e1e07c01f18db130cb27fe..febd7a23feb124b97688f334037daafc07a4e4e0 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 = "1.0.0.0";
+        public const string CurrentAssemblyFileVersion = "1.0.1.0";
 
         /// <summary>
         /// Current version of gRPC C#
         /// </summary>
-        public const string CurrentVersion = "1.0.0";
+        public const string CurrentVersion = "1.0.1-pre1";
     }
 }
diff --git a/src/csharp/Grpc.Core/project.json b/src/csharp/Grpc.Core/project.json
index 5bcbf2ec79ab1187f528c98b8160819fbde38d18..4e99656273070a2a47bebe6d9faf4854d351a0b4 100644
--- a/src/csharp/Grpc.Core/project.json
+++ b/src/csharp/Grpc.Core/project.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.0.0",
+  "version": "1.0.1-pre1",
   "title": "gRPC C# Core",
   "authors": [ "Google Inc." ],
   "copyright": "Copyright 2015, Google Inc.",
diff --git a/src/csharp/Grpc.HealthCheck/project.json b/src/csharp/Grpc.HealthCheck/project.json
index 493d25f424571df0b3ceee2bc36066895bbd4479..af0b92be203b9611a671df2ec034af0e3e520fa0 100644
--- a/src/csharp/Grpc.HealthCheck/project.json
+++ b/src/csharp/Grpc.HealthCheck/project.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.0.0",
+  "version": "1.0.1-pre1",
   "title": "gRPC C# Healthchecking",
   "authors": [ "Google Inc." ],
   "copyright": "Copyright 2015, Google Inc.",
@@ -22,7 +22,7 @@
     }
   },
   "dependencies": {
-    "Grpc.Core": "1.0.0",
+    "Grpc.Core": "1.0.1-pre1",
     "Google.Protobuf": "3.0.0-beta3"
   },
   "frameworks": {
diff --git a/src/csharp/build_packages.bat b/src/csharp/build_packages.bat
index 87abc37419786c0f9acd0ce302393b3b9809ae3d..b1ca9cda9e422979f7f162e8699aeccf92d6749d 100644
--- a/src/csharp/build_packages.bat
+++ b/src/csharp/build_packages.bat
@@ -30,7 +30,7 @@
 @rem Builds gRPC NuGet packages
 
 @rem Current package versions
-set VERSION=1.0.0
+set VERSION=1.0.1-pre1
 set PROTOBUF_VERSION=3.0.0
 
 @rem Adjust the location of nuget.exe
diff --git a/src/node/health_check/package.json b/src/node/health_check/package.json
index f9bc961abf5d02ccd44a2ad52ddcae6289e38f81..7e5dbb556b5e7642f23d867f30313912b4b8faa8 100644
--- a/src/node/health_check/package.json
+++ b/src/node/health_check/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-health-check",
-  "version": "1.0.0",
+  "version": "1.0.1-pre1",
   "author": "Google Inc.",
   "description": "Health check service for use with gRPC",
   "repository": {
@@ -15,7 +15,7 @@
     }
   ],
   "dependencies": {
-    "grpc": "^1.0.0",
+    "grpc": "^1.0.1-pre1",
     "lodash": "^3.9.3",
     "google-protobuf": "^3.0.0"
   },
diff --git a/src/node/tools/package.json b/src/node/tools/package.json
index 2b0cd5ea31679efeade44cb3642662ad0e5a6998..fd22e752cf157c326a202e4f7410d1f8d28f6365 100644
--- a/src/node/tools/package.json
+++ b/src/node/tools/package.json
@@ -1,6 +1,6 @@
 {
   "name": "grpc-tools",
-  "version": "1.0.0",
+  "version": "1.0.1-pre1",
   "author": "Google Inc.",
   "description": "Tools for developing with gRPC on Node.js",
   "homepage": "http://www.grpc.io/",
diff --git a/src/python/grpcio/grpc_version.py b/src/python/grpcio/grpc_version.py
index 643a3197deb09aa6695e54a8bea917511fedc56c..efa94a02283edba95acbc1a012673c5b2936a30d 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='1.0.0'
+VERSION='1.0.1rc1'
diff --git a/src/python/grpcio_health_checking/grpc_version.py b/src/python/grpcio_health_checking/grpc_version.py
index 54a89a1a2d71115d145f2bed92f3927fbff1db31..082453c1accf0f79f2b6689c263fa8ed7781631e 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='1.0.0'
+VERSION='1.0.1rc1'
diff --git a/src/python/grpcio_tests/grpc_version.py b/src/python/grpcio_tests/grpc_version.py
index 87d9b5e66e6d7739afd1d50d8b959358e13a83ec..79c479cccdba14b2932ebcdcbe07f9af8bc484b3 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='1.0.0'
+VERSION='1.0.1rc1'
diff --git a/src/ruby/lib/grpc/version.rb b/src/ruby/lib/grpc/version.rb
index caba5a5633cfba1b43938f370c98d47a40fdc3f6..6de123492db204e2a85a062606b36c1baa557d09 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 = '1.0.0'
+  VERSION = '1.0.1.pre1'
 end
diff --git a/src/ruby/tools/version.rb b/src/ruby/tools/version.rb
index a7b31412be1733f1dac179ac3fc05f780e8c2975..205eca0daacfae689f703ebc055b914ff0ed5aca 100644
--- a/src/ruby/tools/version.rb
+++ b/src/ruby/tools/version.rb
@@ -29,6 +29,6 @@
 
 module GRPC
   module Tools
-    VERSION = '1.0.0'
+    VERSION = '1.0.1.pre1'
   end
 end
diff --git a/tools/distrib/python/grpcio_tools/grpc_version.py b/tools/distrib/python/grpcio_tools/grpc_version.py
index 91ca898f5501787649063111ceb7b2d4ef3ed22e..510c26b2e02e8d47e7dc48952447bfefa832b521 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='1.0.0'
+VERSION='1.0.1rc1'
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index 0cee24ed8b1649f3c1bb1d4254ac755383ce6495..323f5f6c124326b0612ed5e0a27b0f8b166e7187 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         = 1.0.0
+PROJECT_NUMBER         = 1.0.1-pre1
 
 # 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 4cd0e2fc6b58d7e56c4d08003ed85c3c426e5ea4..8d38d9a36f2594cb8b295f5a0689405b6b951a20 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         = 1.0.0
+PROJECT_NUMBER         = 1.0.1-pre1
 
 # 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 b/tools/doxygen/Doxyfile.core
index 01644c324ff451292e7a1c6154365080f1f62c4d..991531fccc4ac2ba3901b5ff9af5aa246bd26ed1 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         = 1.0.0
+PROJECT_NUMBER         = 1.0.1-pre1
 
 # 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 528ea113c832f46a9f783944c184e6c9c0a454ef..c8d53eb9ab7e557d69e4f295732f924bf7c5b4f1 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         = 1.0.0
+PROJECT_NUMBER         = 1.0.1-pre1
 
 # 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