diff --git a/System.Device.I2c/System.Device.I2c.nfproj b/System.Device.I2c/System.Device.I2c.nfproj
index 7af649f..a7d4c0f 100644
--- a/System.Device.I2c/System.Device.I2c.nfproj
+++ b/System.Device.I2c/System.Device.I2c.nfproj
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup Label="Globals">
     <NanoFrameworkProjectSystemPath>$(MSBuildToolsPath)..\..\..\nanoFramework\v1.0\</NanoFrameworkProjectSystemPath>
@@ -38,7 +38,7 @@
     </NFMDP_PE_ExcludeClassByName>
   </ItemGroup>
   <ItemGroup>
-    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.CoreLibrary.1.10.5-alpha.145.6\lib\mscorlib.dll">
+    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.CoreLibrary.1.10.5-preview.4\lib\mscorlib.dll">
       <InProject>false</InProject>
     </NFMDP_PE_LoadHints>
   </ItemGroup>
@@ -57,7 +57,7 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="mscorlib, Version=1.10.5.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.CoreLibrary.1.10.5-alpha.145.6\lib\mscorlib.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.CoreLibrary.1.10.5-preview.4\lib\mscorlib.dll</HintPath>
       <Private>True</Private>
     </Reference>
   </ItemGroup>
diff --git a/System.Device.I2c/packages.config b/System.Device.I2c/packages.config
index 071a607..1fc28f4 100644
--- a/System.Device.I2c/packages.config
+++ b/System.Device.I2c/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="nanoFramework.CoreLibrary" version="1.10.5-alpha.145.6" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.CoreLibrary" version="1.10.5-preview.4" targetFramework="netnanoframework10" />
   <package id="Nerdbank.GitVersioning" version="3.1.91" developmentDependency="true" targetFramework="netnanoframework10" />
 </packages>
\ No newline at end of file
diff --git a/nanoFramework.System.Device.I2c.DELIVERABLES.nuspec b/nanoFramework.System.Device.I2c.DELIVERABLES.nuspec
index ee7098b..0b0de14 100644
--- a/nanoFramework.System.Device.I2c.DELIVERABLES.nuspec
+++ b/nanoFramework.System.Device.I2c.DELIVERABLES.nuspec
@@ -18,7 +18,7 @@
     <tags>
     </tags>
     <dependencies>
-      <dependency id="nanoFramework.CoreLibrary" version="1.10.5-alpha.145.6" />
+      <dependency id="nanoFramework.CoreLibrary" version="1.10.5-preview.4" />
     </dependencies>
   </metadata>
   <files>
diff --git a/nanoFramework.System.Device.I2c.nuspec b/nanoFramework.System.Device.I2c.nuspec
index f759dad..65f5936 100644
--- a/nanoFramework.System.Device.I2c.nuspec
+++ b/nanoFramework.System.Device.I2c.nuspec
@@ -20,7 +20,7 @@ This package requires a target with System.Device.I2c v$nativeVersion$ (checksum
     <summary>System.Device.I2c assembly for .NET nanoFramework C# projects</summary>
     <tags>nanoFramework C# csharp netmf netnf System.Device.I2c</tags>
     <dependencies>
-      <dependency id="nanoFramework.CoreLibrary" version="1.10.5-alpha.145.6" />
+      <dependency id="nanoFramework.CoreLibrary" version="1.10.5-preview.4" />
     </dependencies>
   </metadata>
   <files>
diff --git a/nanoFramework.System.Device.I2c.sln b/nanoFramework.System.Device.I2c.sln
index 85828c0..452f90e 100644
--- a/nanoFramework.System.Device.I2c.sln
+++ b/nanoFramework.System.Device.I2c.sln
@@ -1,4 +1,4 @@
-
+
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
 VisualStudioVersion = 15.0.27130.2010