diff --git a/TestAssets/TestPackages/dotnet-dependency-tool-invoker/project.json b/TestAssets/TestPackages/dotnet-dependency-tool-invoker/project.json
index c25e13886..47f4722c5 100644
--- a/TestAssets/TestPackages/dotnet-dependency-tool-invoker/project.json
+++ b/TestAssets/TestPackages/dotnet-dependency-tool-invoker/project.json
@@ -12,9 +12,9 @@
       "type": "platform",
       "version": "1.0.0-rc2-*"
     },
-    "Microsoft.DotNet.Cli.Utils": "1.0.0-rc2-preview1-*",
+    "Microsoft.DotNet.Cli.Utils": "1.0.0-preview1-*",
     "Microsoft.DotNet.ProjectModel": "1.0.0-rc2-*",
-    "Microsoft.DotNet.Compiler.Common": "1.0.0-rc2-preview1-*"
+    "Microsoft.DotNet.Compiler.Common": "1.0.0-preview1-*"
   },
   "frameworks": {
     "netcoreapp1.0": {
diff --git a/branchinfo.txt b/branchinfo.txt
index 15703d376..bdb5ffaf6 100644
--- a/branchinfo.txt
+++ b/branchinfo.txt
@@ -4,5 +4,5 @@
 MAJOR_VERSION=1
 MINOR_VERSION=0
 PATCH_VERSION=0
-RELEASE_SUFFIX=rc2-preview1
+RELEASE_SUFFIX=preview1
 CHANNEL=beta
diff --git a/packaging/windows/clisdk/registrykeys.wxs b/packaging/windows/clisdk/registrykeys.wxs
index 30e2e4b14..4f8853636 100644
--- a/packaging/windows/clisdk/registrykeys.wxs
+++ b/packaging/windows/clisdk/registrykeys.wxs
@@ -10,7 +10,7 @@
       </Component>
       <Component Id="SetupRegistry_x86_RC2_Compat_Key" Directory="TARGETDIR" Win64="no">
         <RegistryKey Root="HKLM" Key="SOFTWARE\dotnet\Setup\InstalledVersions\$(var.Platform)\sdk">
-          <RegistryValue Action="write" Name="1.0.0-rc2-preview1" Type="integer" Value="1" KeyPath="yes"/>
+          <RegistryValue Action="write" Name="1.0.0-preview1" Type="integer" Value="1" KeyPath="yes"/>
         </RegistryKey>
       </Component>
     </ComponentGroup>
diff --git a/scripts/dotnet-cli-build/Utils/Monikers.cs b/scripts/dotnet-cli-build/Utils/Monikers.cs
index e9cf29a37..76b51389a 100644
--- a/scripts/dotnet-cli-build/Utils/Monikers.cs
+++ b/scripts/dotnet-cli-build/Utils/Monikers.cs
@@ -32,7 +32,7 @@ namespace Microsoft.DotNet.Cli.Build
                 case "beta":
                 case "rc1":
                 case "rc2":
-                case "rc2-preview1":
+                case "preview1":
                 case "rtm":
                     packageName = "dotnet";
                     break;
diff --git a/src/Microsoft.DotNet.Compiler.Common/project.json b/src/Microsoft.DotNet.Compiler.Common/project.json
index 1ba421586..1c11b0792 100644
--- a/src/Microsoft.DotNet.Compiler.Common/project.json
+++ b/src/Microsoft.DotNet.Compiler.Common/project.json
@@ -1,13 +1,13 @@
 {
-  "version": "1.0.0-rc2-preview1-*",
+  "version": "1.0.0-preview1-*",
   "compilationOptions": {
     "keyFile": "../../tools/Key.snk"
   },
   "dependencies": {
     "Microsoft.CodeAnalysis.CSharp": "1.3.0-beta1-20160429-01",
     "Microsoft.DotNet.ProjectModel": "1.0.0-rc2-*",
-    "Microsoft.DotNet.Cli.Utils": "1.0.0-rc2-preview1-*",
-    "Microsoft.DotNet.Files": "1.0.0-rc2-preview1-*"
+    "Microsoft.DotNet.Cli.Utils": "1.0.0-preview1-*",
+    "Microsoft.DotNet.Files": "1.0.0-preview1-*"
   },
   "frameworks": {
     "net451": {
diff --git a/src/Microsoft.DotNet.Files/project.json b/src/Microsoft.DotNet.Files/project.json
index 805c4f627..c7fbc527a 100644
--- a/src/Microsoft.DotNet.Files/project.json
+++ b/src/Microsoft.DotNet.Files/project.json
@@ -1,11 +1,11 @@
 {
-  "version": "1.0.0-rc2-preview1-*",
+  "version": "1.0.0-preview1-*",
   "compilationOptions": {
     "keyFile": "../../tools/Key.snk"
   },
   "description": "Abstraction to interact with the file system and file paths.",
   "dependencies": {
-    "Microsoft.DotNet.Cli.Utils": "1.0.0-rc2-preview1-*",
+    "Microsoft.DotNet.Cli.Utils": "1.0.0-preview1-*",
     "Microsoft.DotNet.ProjectModel": "1.0.0-rc2-*",
     "System.Linq.Expressions": "4.0.11-rc2-24027"
   },
diff --git a/src/Microsoft.DotNet.ProjectModel.Loader/project.json b/src/Microsoft.DotNet.ProjectModel.Loader/project.json
index c586ea3de..6a61faa34 100644
--- a/src/Microsoft.DotNet.ProjectModel.Loader/project.json
+++ b/src/Microsoft.DotNet.ProjectModel.Loader/project.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.0.0-rc2-preview1-*",
+  "version": "1.0.0-preview1-*",
   "compilationOptions": {
     "keyFile": "../../tools/Key.snk"
   },
diff --git a/src/Microsoft.DotNet.ProjectModel.Workspaces/project.json b/src/Microsoft.DotNet.ProjectModel.Workspaces/project.json
index 9caff8b6a..148c104a0 100644
--- a/src/Microsoft.DotNet.ProjectModel.Workspaces/project.json
+++ b/src/Microsoft.DotNet.ProjectModel.Workspaces/project.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.0.0-rc2-*",
+  "version": "1.0.0-preview1-*",
   "compilationOptions": {
     "keyFile": "../../tools/Key.snk"
   },
diff --git a/src/Microsoft.DotNet.TestFramework/project.json b/src/Microsoft.DotNet.TestFramework/project.json
index de9d1ea1e..72c0ce527 100644
--- a/src/Microsoft.DotNet.TestFramework/project.json
+++ b/src/Microsoft.DotNet.TestFramework/project.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.0.0-rc2-preview1-*",
+  "version": "1.0.0-preview1-*",
   "description": "Microsoft.DotNet.TestFramework Class Library",
   "tags": [
     ""
@@ -10,7 +10,7 @@
   "projectUrl": "",
   "licenseUrl": "",
   "dependencies": {
-    "Microsoft.DotNet.Cli.Utils": "1.0.0-rc2-preview1-*"
+    "Microsoft.DotNet.Cli.Utils": "1.0.0-preview1-*"
   },
   "frameworks": {
     "netstandard1.5": {
diff --git a/src/Microsoft.Extensions.Testing.Abstractions/project.json b/src/Microsoft.Extensions.Testing.Abstractions/project.json
index 22091ad49..6b2a69a2b 100644
--- a/src/Microsoft.Extensions.Testing.Abstractions/project.json
+++ b/src/Microsoft.Extensions.Testing.Abstractions/project.json
@@ -1,6 +1,6 @@
 {
   "description": "Abstractions for test runners to communicate to a tool, such as Visual Studio.",
-  "version": "1.0.0-rc2-preview1-*",
+  "version": "1.0.0-preview1-*",
   "repository": {
     "type": "git",
     "url": "git://github.com/dotnet/cli"
diff --git a/src/dotnet-compile-fsc/project.json b/src/dotnet-compile-fsc/project.json
index f5db37203..457470208 100644
--- a/src/dotnet-compile-fsc/project.json
+++ b/src/dotnet-compile-fsc/project.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.0.0-rc2-preview1-*",
+  "version": "1.0.0-preview1-*",
   "compilationOptions": {
     "emitEntryPoint": true
   },
@@ -12,8 +12,8 @@
   "dependencies": {
     "Microsoft.FSharp.Compiler.netcore": "1.0.0-alpha-160318",
     "Microsoft.DotNet.ProjectModel": "1.0.0-rc2-*",
-    "Microsoft.DotNet.Compiler.Common": "1.0.0-rc2-preview1-*",
-    "Microsoft.DotNet.Cli.Utils": "1.0.0-rc2-preview1-*",
+    "Microsoft.DotNet.Compiler.Common": "1.0.0-preview1-*",
+    "Microsoft.DotNet.Cli.Utils": "1.0.0-preview1-*",
     "Microsoft.NETCore.App": {
       "type": "platform",
       "version": "1.0.0-rc2-*"
diff --git a/src/dotnet/project.json b/src/dotnet/project.json
index acbdd88ad..4d9e2a05a 100644
--- a/src/dotnet/project.json
+++ b/src/dotnet/project.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.0.0-rc2-preview1-*",
+  "version": "1.0.0-preview1-*",
   "compilationOptions": {
     "emitEntryPoint": true
   },
@@ -26,9 +26,9 @@
     "System.Diagnostics.FileVersionInfo": "4.0.0-rc2-24027",
     "Microsoft.ApplicationInsights": "2.0.0",
     "Microsoft.DotNet.ProjectModel": "1.0.0-rc2-*",
-    "Microsoft.DotNet.Compiler.Common": "1.0.0-rc2-preview1-*",
-    "Microsoft.DotNet.Cli.Utils": "1.0.0-rc2-preview1-*",
-    "Microsoft.Extensions.Testing.Abstractions": "1.0.0-rc2-preview1-*",
+    "Microsoft.DotNet.Compiler.Common": "1.0.0-preview1-*",
+    "Microsoft.DotNet.Cli.Utils": "1.0.0-preview1-*",
+    "Microsoft.Extensions.Testing.Abstractions": "1.0.0-preview1-*",
     "Microsoft.NETCore.ConsoleHost": "1.0.0-rc2-24027",
     "Microsoft.NETCore.TestHost": "1.0.0-rc2-24027",
     "Microsoft.NETCore.App": {
diff --git a/test/Microsoft.DotNet.Tools.Tests.Utilities/project.json b/test/Microsoft.DotNet.Tools.Tests.Utilities/project.json
index b8dc0c699..3b28d3cf1 100644
--- a/test/Microsoft.DotNet.Tools.Tests.Utilities/project.json
+++ b/test/Microsoft.DotNet.Tools.Tests.Utilities/project.json
@@ -8,8 +8,8 @@
     "FluentAssertions": "4.0.0",
     "xunit": "2.1.0",
     "dotnet-test-xunit": "1.0.0-rc2-173361-36",
-    "Microsoft.DotNet.TestFramework": "1.0.0-rc2-preview1-*",
-    "Microsoft.DotNet.Cli.Utils": "1.0.0-rc2-preview1-*",
+    "Microsoft.DotNet.TestFramework": "1.0.0-preview1-*",
+    "Microsoft.DotNet.Cli.Utils": "1.0.0-preview1-*",
     "Microsoft.DotNet.ProjectModel": "1.0.0-rc2-*",
     "Microsoft.DotNet.InternalAbstractions": {
       "target": "project",
diff --git a/test/dotnet-publish.Tests/project.json b/test/dotnet-publish.Tests/project.json
index 383f35c9b..4fdc3cec5 100644
--- a/test/dotnet-publish.Tests/project.json
+++ b/test/dotnet-publish.Tests/project.json
@@ -6,7 +6,7 @@
       "version": "1.0.0-rc2-*"
     },
     "System.Runtime.Serialization.Primitives": "4.1.1-rc2-24027",
-    "Microsoft.DotNet.TestFramework": "1.0.0-rc2-preview1-*",
+    "Microsoft.DotNet.TestFramework": "1.0.0-preview1-*",
     "Microsoft.DotNet.Tools.Tests.Utilities": {
       "target": "project"
     },
diff --git a/tools/MultiProjectValidator/project.json b/tools/MultiProjectValidator/project.json
index 820d02740..36bcb8de7 100644
--- a/tools/MultiProjectValidator/project.json
+++ b/tools/MultiProjectValidator/project.json
@@ -7,7 +7,7 @@
   "dependencies": {
     "NETStandard.Library": "1.5.0-rc2-24027",
     "Microsoft.DotNet.ProjectModel": "1.0.0-rc2-*",
-    "Microsoft.DotNet.Cli.Utils": "1.0.0-rc2-preview1-*"
+    "Microsoft.DotNet.Cli.Utils": "1.0.0-preview1-*"
   },
   "frameworks": {
     "netstandardapp1.5": {
diff --git a/tools/RuntimeGraphGenerator/project.json b/tools/RuntimeGraphGenerator/project.json
index e1a1a091b..15b697567 100644
--- a/tools/RuntimeGraphGenerator/project.json
+++ b/tools/RuntimeGraphGenerator/project.json
@@ -9,7 +9,7 @@
     "System.CommandLine": "0.1.0-e160119-1",
     "System.Runtime.Serialization.Json": "4.0.2-rc2-24027",
     "Microsoft.DotNet.ProjectModel": "1.0.0-rc2-*",
-    "Microsoft.DotNet.Cli.Utils": "1.0.0-rc2-preview1-*",
+    "Microsoft.DotNet.Cli.Utils": "1.0.0-preview1-*",
     "Microsoft.NETCore.ConsoleHost": "1.0.0-rc2-24027",
     "NETStandard.Library": "1.5.0-rc2-24027"
   },