diff --git a/System.IO.FileSystem.UnitTests/System.IO.FileSystem.UnitTests.nfproj b/System.IO.FileSystem.UnitTests/System.IO.FileSystem.UnitTests.nfproj
index 463930e..e96f044 100644
--- a/System.IO.FileSystem.UnitTests/System.IO.FileSystem.UnitTests.nfproj
+++ b/System.IO.FileSystem.UnitTests/System.IO.FileSystem.UnitTests.nfproj
@@ -55,10 +55,10 @@
       <HintPath>..\packages\nanoFramework.System.Text.2.0.0-preview.15\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
     </Reference>
     <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.52\lib\nanoFramework.TestFramework.dll</HintPath>
     </Reference>
     <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.52\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
     </Reference>
     <Reference Include="System.IO.Streams, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.15\lib\netnano1.0\System.IO.Streams.dll</HintPath>
diff --git a/System.IO.FileSystem.UnitTests/packages.config b/System.IO.FileSystem.UnitTests/packages.config
index d261ae9..aaac0fa 100644
--- a/System.IO.FileSystem.UnitTests/packages.config
+++ b/System.IO.FileSystem.UnitTests/packages.config
@@ -3,5 +3,5 @@
   <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.43" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.IO.Streams" version="2.0.0-preview.15" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Text" version="2.0.0-preview.15" targetFramework="netnano1.0" />
-  <package id="nanoFramework.TestFramework" version="4.0.0-preview.47" targetFramework="netnano1.0" developmentDependency="true" />
+  <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/System.IO.FileSystem.UnitTests/packages.lock.json b/System.IO.FileSystem.UnitTests/packages.lock.json
index 2848678..02029c5 100644
--- a/System.IO.FileSystem.UnitTests/packages.lock.json
+++ b/System.IO.FileSystem.UnitTests/packages.lock.json
@@ -22,9 +22,9 @@
       },
       "nanoFramework.TestFramework": {
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-        "resolved": "4.0.0-preview.47",
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+        "requested": "[4.0.0-preview.52, 4.0.0-preview.52]",
+        "resolved": "4.0.0-preview.52",
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