diff --git a/System.IO.FileSystem.UnitTests/System.IO.FileSystem.UnitTests.nfproj b/System.IO.FileSystem.UnitTests/System.IO.FileSystem.UnitTests.nfproj
index dcee2d8..a54ff00 100644
--- a/System.IO.FileSystem.UnitTests/System.IO.FileSystem.UnitTests.nfproj
+++ b/System.IO.FileSystem.UnitTests/System.IO.FileSystem.UnitTests.nfproj
@@ -52,7 +52,7 @@
       <HintPath>..\packages\nanoFramework.CoreLibrary.2.0.0-preview.49\lib\netnano1.0\mscorlib.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.System.Text, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Text.2.0.0-preview.15\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Text.2.0.0-preview.18\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.52\lib\nanoFramework.TestFramework.dll</HintPath>
@@ -61,7 +61,7 @@
       <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>
+      <HintPath>..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.18\lib\netnano1.0\System.IO.Streams.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/System.IO.FileSystem.UnitTests/packages.config b/System.IO.FileSystem.UnitTests/packages.config
index 705553a..661dfc6 100644
--- a/System.IO.FileSystem.UnitTests/packages.config
+++ b/System.IO.FileSystem.UnitTests/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" 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.System.IO.Streams" version="2.0.0-preview.18" targetFramework="netnano1.0" />
+  <package id="nanoFramework.System.Text" version="2.0.0-preview.18" 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/System.IO.FileSystem.UnitTests/packages.lock.json b/System.IO.FileSystem.UnitTests/packages.lock.json
index ae27c54..dcc9a74 100644
--- a/System.IO.FileSystem.UnitTests/packages.lock.json
+++ b/System.IO.FileSystem.UnitTests/packages.lock.json
@@ -10,15 +10,15 @@
       },
       "nanoFramework.System.IO.Streams": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
-        "resolved": "2.0.0-preview.15",
-        "contentHash": "VjdWLxapAF4hEr0vtJPAFEOY1xT9TyQlAB9wyRfcYmvoHiBIQWB0krgpw0yvC2C1AOLgE9op3HpsFbzrVRw3EA=="
+        "requested": "[2.0.0-preview.18, 2.0.0-preview.18]",
+        "resolved": "2.0.0-preview.18",
+        "contentHash": "X6Zv6eYRWqSY1eu7S7SwfIoFtFQfc8Rrl7CJN8dxuiry0K4SioSjuRFvnGerTnCWPEXy1gXGbbLRBVkYscw9fg=="
       },
       "nanoFramework.System.Text": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
-        "resolved": "2.0.0-preview.15",
-        "contentHash": "zhVxQ+zUBkDPhpU35xX9JT/H8bFjo0ylQRmX/45QtM3QJQRd7a327R1PfBhpU5o3kpx2V8AcOgZBM8UilKwQeA=="
+        "requested": "[2.0.0-preview.18, 2.0.0-preview.18]",
+        "resolved": "2.0.0-preview.18",
+        "contentHash": "ZnV49vaKgIzXN223aZ8Co3GZexDY+0d92QmOqfMdM/tzGIG2gnOy90UfAwQ3/n3Ea3a5RxNNgSxwxNGwsFgyMQ=="
       },
       "nanoFramework.TestFramework": {
         "type": "Direct",
diff --git a/System.IO.FileSystem/System.IO.FileSystem.nfproj b/System.IO.FileSystem/System.IO.FileSystem.nfproj
index f0b966a..ed9472c 100644
--- a/System.IO.FileSystem/System.IO.FileSystem.nfproj
+++ b/System.IO.FileSystem/System.IO.FileSystem.nfproj
@@ -83,10 +83,10 @@
       <HintPath>..\packages\nanoFramework.Runtime.Events.2.0.0-preview.12\lib\netnano1.0\nanoFramework.Runtime.Events.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.System.Text, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Text.2.0.0-preview.15\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Text.2.0.0-preview.18\lib\netnano1.0\nanoFramework.System.Text.dll</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>
+      <HintPath>..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.18\lib\netnano1.0\System.IO.Streams.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ProjectExtensions>
diff --git a/System.IO.FileSystem/packages.config b/System.IO.FileSystem/packages.config
index 970cf37..4e737ac 100644
--- a/System.IO.FileSystem/packages.config
+++ b/System.IO.FileSystem/packages.config
@@ -2,7 +2,7 @@
 <packages>
   <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" targetFramework="netnano1.0" />
   <package id="nanoFramework.Runtime.Events" version="2.0.0-preview.12" 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.System.IO.Streams" version="2.0.0-preview.18" targetFramework="netnano1.0" />
+  <package id="nanoFramework.System.Text" version="2.0.0-preview.18" 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/System.IO.FileSystem/packages.lock.json b/System.IO.FileSystem/packages.lock.json
index 782a7fd..ded3f2b 100644
--- a/System.IO.FileSystem/packages.lock.json
+++ b/System.IO.FileSystem/packages.lock.json
@@ -16,15 +16,15 @@
       },
       "nanoFramework.System.IO.Streams": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
-        "resolved": "2.0.0-preview.15",
-        "contentHash": "VjdWLxapAF4hEr0vtJPAFEOY1xT9TyQlAB9wyRfcYmvoHiBIQWB0krgpw0yvC2C1AOLgE9op3HpsFbzrVRw3EA=="
+        "requested": "[2.0.0-preview.18, 2.0.0-preview.18]",
+        "resolved": "2.0.0-preview.18",
+        "contentHash": "X6Zv6eYRWqSY1eu7S7SwfIoFtFQfc8Rrl7CJN8dxuiry0K4SioSjuRFvnGerTnCWPEXy1gXGbbLRBVkYscw9fg=="
       },
       "nanoFramework.System.Text": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
-        "resolved": "2.0.0-preview.15",
-        "contentHash": "zhVxQ+zUBkDPhpU35xX9JT/H8bFjo0ylQRmX/45QtM3QJQRd7a327R1PfBhpU5o3kpx2V8AcOgZBM8UilKwQeA=="
+        "requested": "[2.0.0-preview.18, 2.0.0-preview.18]",
+        "resolved": "2.0.0-preview.18",
+        "contentHash": "ZnV49vaKgIzXN223aZ8Co3GZexDY+0d92QmOqfMdM/tzGIG2gnOy90UfAwQ3/n3Ea3a5RxNNgSxwxNGwsFgyMQ=="
       },
       "Nerdbank.GitVersioning": {
         "type": "Direct",
diff --git a/nanoFramework.System.IO.FileSystem.nuspec b/nanoFramework.System.IO.FileSystem.nuspec
index c45ba39..9cef04b 100644
--- a/nanoFramework.System.IO.FileSystem.nuspec
+++ b/nanoFramework.System.IO.FileSystem.nuspec
@@ -22,8 +22,8 @@ This package requires a target with System.IO.FileSystem v$nativeVersion$ (check
       <group targetFramework=".NETnanoFramework1.0">
         <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" />
         <dependency id="nanoFramework.Runtime.Events" version="2.0.0-preview.12" />
-        <dependency id="nanoFramework.System.IO.Streams" version="2.0.0-preview.15" />
-        <dependency id="nanoFramework.System.Text" version="2.0.0-preview.15" />
+        <dependency id="nanoFramework.System.IO.Streams" version="2.0.0-preview.18" />
+        <dependency id="nanoFramework.System.Text" version="2.0.0-preview.18" />
       </group>
     </dependencies>
   </metadata>