diff --git a/Tests/System.Threading.CancellationToken/System.Threading.CancellationToken.nfproj b/Tests/System.Threading.CancellationToken/System.Threading.CancellationToken.nfproj
index 20facc9..dba7c88 100644
--- a/Tests/System.Threading.CancellationToken/System.Threading.CancellationToken.nfproj
+++ b/Tests/System.Threading.CancellationToken/System.Threading.CancellationToken.nfproj
@@ -31,7 +31,7 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.CoreLibrary.2.0.0-preview.43\lib\netnano1.0\mscorlib.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.CoreLibrary.2.0.0-preview.49\lib\netnano1.0\mscorlib.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.TestFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.52\lib\nanoFramework.TestFramework.dll</HintPath>
diff --git a/Tests/System.Threading.CancellationToken/packages.config b/Tests/System.Threading.CancellationToken/packages.config
index 6c5d277..c556982 100644
--- a/Tests/System.Threading.CancellationToken/packages.config
+++ b/Tests/System.Threading.CancellationToken/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.43" targetFramework="netnano1.0" />
+  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" targetFramework="netnano1.0" />
   <package id="nanoFramework.TestFramework" version="4.0.0-preview.52" targetFramework="netnano1.0" developmentDependency="true" />
 </packages>
\ No newline at end of file
diff --git a/Tests/System.Threading.CancellationToken/packages.lock.json b/Tests/System.Threading.CancellationToken/packages.lock.json
index 9308a68..21955ba 100644
--- a/Tests/System.Threading.CancellationToken/packages.lock.json
+++ b/Tests/System.Threading.CancellationToken/packages.lock.json
@@ -4,9 +4,9 @@
     ".NETnanoFramework,Version=v1.0": {
       "nanoFramework.CoreLibrary": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.43, 2.0.0-preview.43]",
-        "resolved": "2.0.0-preview.43",
-        "contentHash": "ijOdswxNI+zhN7MrRMjJPe7pAVhqARvpEOFKUKH6D18NUS3CCQ9+IoyVs3zJhmmBk53YmAErFAdCnAWLVxUu8Q=="
+        "requested": "[2.0.0-preview.49, 2.0.0-preview.49]",
+        "resolved": "2.0.0-preview.49",
+        "contentHash": "/8/fw1qqEql05aelTR9QQi4ZF2M+Mdwuemjf9rul8yaOpl6jjnhhKfdRJMh4+BXp5VjwTZsALJVpp2aN+e7vzw=="
       },
       "nanoFramework.TestFramework": {
         "type": "Direct",
diff --git a/nanoFramework.System.Threading.nuspec b/nanoFramework.System.Threading.nuspec
index eb0e51e..4627be8 100644
--- a/nanoFramework.System.Threading.nuspec
+++ b/nanoFramework.System.Threading.nuspec
@@ -19,7 +19,7 @@
     <tags>nanoFramework C# csharp netmf netnf </tags>
     <dependencies>
       <group targetFramework=".NETnanoFramework1.0">
-        <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.43" />
+        <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" />
       </group>
     </dependencies>
   </metadata>
diff --git a/nanoFramework.System.Threading/nanoFramework.System.Threading.nfproj b/nanoFramework.System.Threading/nanoFramework.System.Threading.nfproj
index 4b0d89a..810446b 100644
--- a/nanoFramework.System.Threading/nanoFramework.System.Threading.nfproj
+++ b/nanoFramework.System.Threading/nanoFramework.System.Threading.nfproj
@@ -69,7 +69,7 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.CoreLibrary.2.0.0-preview.43\lib\netnano1.0\mscorlib.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.CoreLibrary.2.0.0-preview.49\lib\netnano1.0\mscorlib.dll</HintPath>
     </Reference>
   </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />
diff --git a/nanoFramework.System.Threading/packages.config b/nanoFramework.System.Threading/packages.config
index 5199020..d36e7c2 100644
--- a/nanoFramework.System.Threading/packages.config
+++ b/nanoFramework.System.Threading/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.43" targetFramework="netnano1.0" />
+  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" targetFramework="netnano1.0" />
   <package id="Nerdbank.GitVersioning" version="3.9.50" developmentDependency="true" targetFramework="netnano1.0" />
 </packages>
\ No newline at end of file
diff --git a/nanoFramework.System.Threading/packages.lock.json b/nanoFramework.System.Threading/packages.lock.json
index bb57127..e95d3b5 100644
--- a/nanoFramework.System.Threading/packages.lock.json
+++ b/nanoFramework.System.Threading/packages.lock.json
@@ -4,9 +4,9 @@
     ".NETnanoFramework,Version=v1.0": {
       "nanoFramework.CoreLibrary": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.43, 2.0.0-preview.43]",
-        "resolved": "2.0.0-preview.43",
-        "contentHash": "ijOdswxNI+zhN7MrRMjJPe7pAVhqARvpEOFKUKH6D18NUS3CCQ9+IoyVs3zJhmmBk53YmAErFAdCnAWLVxUu8Q=="
+        "requested": "[2.0.0-preview.49, 2.0.0-preview.49]",
+        "resolved": "2.0.0-preview.49",
+        "contentHash": "/8/fw1qqEql05aelTR9QQi4ZF2M+Mdwuemjf9rul8yaOpl6jjnhhKfdRJMh4+BXp5VjwTZsALJVpp2aN+e7vzw=="
       },
       "Nerdbank.GitVersioning": {
         "type": "Direct",