diff --git a/Tests/GenericCollections/GenericCollections.nfproj b/Tests/GenericCollections/GenericCollections.nfproj
index 4d1f07b..25d162d 100644
--- a/Tests/GenericCollections/GenericCollections.nfproj
+++ b/Tests/GenericCollections/GenericCollections.nfproj
@@ -40,13 +40,13 @@
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-      <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>
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-      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\lib\nanoFramework.TestFramework.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.54\lib\nanoFramework.TestFramework.dll</HintPath>
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-      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
+      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.54\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
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   </ItemGroup>
   <ItemGroup>
diff --git a/Tests/GenericCollections/packages.config b/Tests/GenericCollections/packages.config
index 8691514..296f0ff 100644
--- a/Tests/GenericCollections/packages.config
+++ b/Tests/GenericCollections/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.TestFramework" version="4.0.0-preview.47" targetFramework="netnano1.0" developmentDependency="true" />
+  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" targetFramework="netnano1.0" />
+  <package id="nanoFramework.TestFramework" version="4.0.0-preview.54" targetFramework="netnano1.0" developmentDependency="true" />
 </packages>
\ No newline at end of file
diff --git a/Tests/GenericCollections/packages.lock.json b/Tests/GenericCollections/packages.lock.json
index 5ee00c5..6deedca 100644
--- a/Tests/GenericCollections/packages.lock.json
+++ b/Tests/GenericCollections/packages.lock.json
@@ -4,15 +4,15 @@
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+        "requested": "[4.0.0-preview.54, 4.0.0-preview.54]",
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diff --git a/Tests/HashtableTests/HashtableTests.nfproj b/Tests/HashtableTests/HashtableTests.nfproj
index 26f2660..e179276 100644
--- a/Tests/HashtableTests/HashtableTests.nfproj
+++ b/Tests/HashtableTests/HashtableTests.nfproj
@@ -34,13 +34,13 @@
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-      <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>
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     <Reference Include="nanoFramework.TestFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\lib\nanoFramework.TestFramework.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.54\lib\nanoFramework.TestFramework.dll</HintPath>
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     <Reference Include="nanoFramework.UnitTestLauncher, Version=0.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
+      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.54\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
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   <ItemGroup>
diff --git a/Tests/HashtableTests/packages.config b/Tests/HashtableTests/packages.config
index 8691514..296f0ff 100644
--- a/Tests/HashtableTests/packages.config
+++ b/Tests/HashtableTests/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
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-  <package id="nanoFramework.TestFramework" version="4.0.0-preview.47" targetFramework="netnano1.0" developmentDependency="true" />
+  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" targetFramework="netnano1.0" />
+  <package id="nanoFramework.TestFramework" version="4.0.0-preview.54" targetFramework="netnano1.0" developmentDependency="true" />
 </packages>
\ No newline at end of file
diff --git a/Tests/HashtableTests/packages.lock.json b/Tests/HashtableTests/packages.lock.json
index 5ee00c5..6deedca 100644
--- a/Tests/HashtableTests/packages.lock.json
+++ b/Tests/HashtableTests/packages.lock.json
@@ -4,15 +4,15 @@
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+        "requested": "[2.0.0-preview.49, 2.0.0-preview.49]",
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+        "requested": "[4.0.0-preview.54, 4.0.0-preview.54]",
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diff --git a/Tests/QueueTests/QueueTests.nfproj b/Tests/QueueTests/QueueTests.nfproj
index cda0e80..8e16cdb 100644
--- a/Tests/QueueTests/QueueTests.nfproj
+++ b/Tests/QueueTests/QueueTests.nfproj
@@ -32,13 +32,13 @@
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-      <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>
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-      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\lib\nanoFramework.TestFramework.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.54\lib\nanoFramework.TestFramework.dll</HintPath>
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-      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
+      <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.54\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
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   </ItemGroup>
   <ItemGroup>
diff --git a/Tests/QueueTests/packages.config b/Tests/QueueTests/packages.config
index 8691514..296f0ff 100644
--- a/Tests/QueueTests/packages.config
+++ b/Tests/QueueTests/packages.config
@@ -1,5 +1,5 @@
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 <packages>
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-  <package id="nanoFramework.TestFramework" version="4.0.0-preview.47" targetFramework="netnano1.0" developmentDependency="true" />
+  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" targetFramework="netnano1.0" />
+  <package id="nanoFramework.TestFramework" version="4.0.0-preview.54" targetFramework="netnano1.0" developmentDependency="true" />
 </packages>
\ No newline at end of file
diff --git a/Tests/QueueTests/packages.lock.json b/Tests/QueueTests/packages.lock.json
index 5ee00c5..6deedca 100644
--- a/Tests/QueueTests/packages.lock.json
+++ b/Tests/QueueTests/packages.lock.json
@@ -4,15 +4,15 @@
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+        "requested": "[2.0.0-preview.49, 2.0.0-preview.49]",
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diff --git a/Tests/StackTests/StackTests.nfproj b/Tests/StackTests/StackTests.nfproj
index 201563d..9e8e810 100644
--- a/Tests/StackTests/StackTests.nfproj
+++ b/Tests/StackTests/StackTests.nfproj
@@ -34,13 +34,13 @@
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diff --git a/Tests/StackTests/packages.config b/Tests/StackTests/packages.config
index 8691514..296f0ff 100644
--- a/Tests/StackTests/packages.config
+++ b/Tests/StackTests/packages.config
@@ -1,5 +1,5 @@
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-  <package id="nanoFramework.TestFramework" version="4.0.0-preview.47" targetFramework="netnano1.0" developmentDependency="true" />
+  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" targetFramework="netnano1.0" />
+  <package id="nanoFramework.TestFramework" version="4.0.0-preview.54" targetFramework="netnano1.0" developmentDependency="true" />
 </packages>
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diff --git a/Tests/StackTests/packages.lock.json b/Tests/StackTests/packages.lock.json
index 5ee00c5..6deedca 100644
--- a/Tests/StackTests/packages.lock.json
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diff --git a/nanoFramework.System.Collections.nuspec b/nanoFramework.System.Collections.nuspec
index f387025..4c06478 100644
--- a/nanoFramework.System.Collections.nuspec
+++ b/nanoFramework.System.Collections.nuspec
@@ -20,7 +20,7 @@ This package requires a target with System.Collections v$nativeVersion$ (checksu
     <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" />
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diff --git a/nanoFramework.System.Collections/nanoFramework.System.Collections.nfproj b/nanoFramework.System.Collections/nanoFramework.System.Collections.nfproj
index 00cd7a8..4208619 100644
--- a/nanoFramework.System.Collections/nanoFramework.System.Collections.nfproj
+++ b/nanoFramework.System.Collections/nanoFramework.System.Collections.nfproj
@@ -75,7 +75,7 @@
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diff --git a/nanoFramework.System.Collections/packages.config b/nanoFramework.System.Collections/packages.config
index 5199020..d36e7c2 100644
--- a/nanoFramework.System.Collections/packages.config
+++ b/nanoFramework.System.Collections/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
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 </packages>
\ No newline at end of file
diff --git a/nanoFramework.System.Collections/packages.lock.json b/nanoFramework.System.Collections/packages.lock.json
index bb57127..e95d3b5 100644
--- a/nanoFramework.System.Collections/packages.lock.json
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