diff --git a/korebuild-lock.txt b/korebuild-lock.txt
index 45463cc71e..b2036f3394 100644
--- a/korebuild-lock.txt
+++ b/korebuild-lock.txt
@@ -1,2 +1,2 @@
-version:2.1.0-preview1-15549
-commithash:f570e08585fec510dd60cd4bfe8795388b757a95
+version:2.1.0-preview1-15569
+commithash:47312a6364ad0ee6d7052eada54da940c9b17931
diff --git a/samples/misc/LatencyTest/LatencyTest.csproj b/samples/misc/LatencyTest/LatencyTest.csproj
index af95fb2ffd..4e37b7bcb3 100644
--- a/samples/misc/LatencyTest/LatencyTest.csproj
+++ b/samples/misc/LatencyTest/LatencyTest.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.1;net461</TargetFrameworks>
     <IsPackable>false</IsPackable>
     <OutputType>exe</OutputType>
   </PropertyGroup>
diff --git a/samples/misc/NodeServicesExamples/NodeServicesExamples.csproj b/samples/misc/NodeServicesExamples/NodeServicesExamples.csproj
index 62569166e7..e42d25247a 100644
--- a/samples/misc/NodeServicesExamples/NodeServicesExamples.csproj
+++ b/samples/misc/NodeServicesExamples/NodeServicesExamples.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.1;net461</TargetFrameworks>
     <TypeScriptCompileBlocked>true</TypeScriptCompileBlocked>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
diff --git a/samples/misc/Webpack/Webpack.csproj b/samples/misc/Webpack/Webpack.csproj
index 62569166e7..e42d25247a 100644
--- a/samples/misc/Webpack/Webpack.csproj
+++ b/samples/misc/Webpack/Webpack.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.1;net461</TargetFrameworks>
     <TypeScriptCompileBlocked>true</TypeScriptCompileBlocked>
     <IsPackable>false</IsPackable>
   </PropertyGroup>