diff --git a/source/nanoFramework.System.Math.DELIVERABLES.nuspec b/source/nanoFramework.System.Math.DELIVERABLES.nuspec
index 35b063b..5e3dfe4 100644
--- a/source/nanoFramework.System.Math.DELIVERABLES.nuspec
+++ b/source/nanoFramework.System.Math.DELIVERABLES.nuspec
@@ -18,7 +18,7 @@
     <tags>
     </tags>
     <dependencies>
-      <dependency id="nanoFramework.CoreLibrary" version="[1.0.6-preview-010]" />
+      <dependency id="nanoFramework.CoreLibrary" version="[1.0.6-preview-021]" />
     </dependencies>
   </metadata>
   <files>
diff --git a/source/nanoFramework.System.Math.nuspec b/source/nanoFramework.System.Math.nuspec
index 0ed236f..e29f462 100644
--- a/source/nanoFramework.System.Math.nuspec
+++ b/source/nanoFramework.System.Math.nuspec
@@ -17,7 +17,7 @@
     <summary>nanoFramework.System.Math assembly for nanoFramework C# projects</summary>
     <tags>nanoFramework C# csharp netmf netnf nanoFramework.System.Math</tags>
     <dependencies>
-      <dependency id="nanoFramework.CoreLibrary" version="[1.0.6-preview-010]" />
+      <dependency id="nanoFramework.CoreLibrary" version="[1.0.6-preview-021]" />
     </dependencies>
   </metadata>
   <files>
diff --git a/source/nanoFramework.System.Math/nanoFramework.System.Math.nfproj b/source/nanoFramework.System.Math/nanoFramework.System.Math.nfproj
index 9c6a036..b7c8a93 100644
--- a/source/nanoFramework.System.Math/nanoFramework.System.Math.nfproj
+++ b/source/nanoFramework.System.Math/nanoFramework.System.Math.nfproj
@@ -45,7 +45,7 @@
     <Name>nanoFramework.System.Math</Name>
   </PropertyGroup>
   <ItemGroup>
-    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.CoreLibrary.1.0.6-preview-010\lib\mscorlib.dll">
+    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.CoreLibrary.1.0.6-preview-021\lib\mscorlib.dll">
       <InProject>false</InProject>
     </NFMDP_PE_LoadHints>
   </ItemGroup>
@@ -58,8 +58,8 @@
     <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
-    <Reference Include="mscorlib, Version=1.0.6.10, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.CoreLibrary.1.0.6-preview-010\lib\mscorlib.dll</HintPath>
+    <Reference Include="mscorlib, Version=1.0.6.21, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+      <HintPath>..\packages\nanoFramework.CoreLibrary.1.0.6-preview-021\lib\mscorlib.dll</HintPath>
       <Private>True</Private>
     </Reference>
   </ItemGroup>
diff --git a/source/nanoFramework.System.Math/packages.config b/source/nanoFramework.System.Math/packages.config
index d8643bd..acf15fb 100644
--- a/source/nanoFramework.System.Math/packages.config
+++ b/source/nanoFramework.System.Math/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="nanoFramework.CoreLibrary" version="1.0.6-preview-010" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.CoreLibrary" version="1.0.6-preview-021" targetFramework="netnanoframework10" />
   <package id="Nerdbank.GitVersioning" version="2.2.33" developmentDependency="true" targetFramework="netnanoframework10" />
 </packages>
\ No newline at end of file