diff --git a/Tests/IPAddressTests/IPAddressTests.nfproj b/Tests/IPAddressTests/IPAddressTests.nfproj
index 15a288b..9837f2c 100644
--- a/Tests/IPAddressTests/IPAddressTests.nfproj
+++ b/Tests/IPAddressTests/IPAddressTests.nfproj
@@ -40,7 +40,7 @@
       <HintPath>..\..\packages\nanoFramework.CoreLibrary.2.0.0-preview.43\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.13\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.System.Text.2.0.0-preview.15\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.TestFramework">
       <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\lib\nanoFramework.TestFramework.dll</HintPath>
@@ -49,7 +49,7 @@
       <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\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.13\lib\netnano1.0\System.IO.Streams.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.15\lib\netnano1.0\System.IO.Streams.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/Tests/IPAddressTests/packages.config b/Tests/IPAddressTests/packages.config
index 3346fc1..d261ae9 100644
--- a/Tests/IPAddressTests/packages.config
+++ b/Tests/IPAddressTests/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.43" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.IO.Streams" version="2.0.0-preview.13" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Text" version="2.0.0-preview.13" 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" />
 </packages>
\ No newline at end of file
diff --git a/Tests/IPAddressTests/packages.lock.json b/Tests/IPAddressTests/packages.lock.json
index 7770d77..2848678 100644
--- a/Tests/IPAddressTests/packages.lock.json
+++ b/Tests/IPAddressTests/packages.lock.json
@@ -10,15 +10,15 @@
       },
       "nanoFramework.System.IO.Streams": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.13, 2.0.0-preview.13]",
-        "resolved": "2.0.0-preview.13",
-        "contentHash": "TQLs+6/JdXhhK+pkvx9/iVnHLhTJ2oo7XBusC73lspLbeWlIzGRwrA9ZyQejdXh44URE05neaimJey786hhZlA=="
+        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
+        "resolved": "2.0.0-preview.15",
+        "contentHash": "VjdWLxapAF4hEr0vtJPAFEOY1xT9TyQlAB9wyRfcYmvoHiBIQWB0krgpw0yvC2C1AOLgE9op3HpsFbzrVRw3EA=="
       },
       "nanoFramework.System.Text": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.13, 2.0.0-preview.13]",
-        "resolved": "2.0.0-preview.13",
-        "contentHash": "kTEKvplebAWeA7j4jb9adST6dxH28Q6c99+Jms6p8cMFxlrUoWhL/GdEiPaPnJSVy1XtsgIfh38WbR757qF8yw=="
+        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
+        "resolved": "2.0.0-preview.15",
+        "contentHash": "zhVxQ+zUBkDPhpU35xX9JT/H8bFjo0ylQRmX/45QtM3QJQRd7a327R1PfBhpU5o3kpx2V8AcOgZBM8UilKwQeA=="
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       "nanoFramework.TestFramework": {
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diff --git a/Tests/NetworkHelperTests/NetworkHelperTests.nfproj b/Tests/NetworkHelperTests/NetworkHelperTests.nfproj
index b9476c1..f35c082 100644
--- a/Tests/NetworkHelperTests/NetworkHelperTests.nfproj
+++ b/Tests/NetworkHelperTests/NetworkHelperTests.nfproj
@@ -49,7 +49,7 @@
       <HintPath>..\..\packages\nanoFramework.CoreLibrary.2.0.0-preview.43\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.13\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.System.Text.2.0.0-preview.15\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.TestFramework">
       <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\lib\nanoFramework.TestFramework.dll</HintPath>
@@ -58,7 +58,7 @@
       <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\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.13\lib\netnano1.0\System.IO.Streams.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.15\lib\netnano1.0\System.IO.Streams.dll</HintPath>
     </Reference>
     <Reference Include="System.Threading, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\..\packages\nanoFramework.System.Threading.2.0.0-preview.9\lib\netnano1.0\System.Threading.dll</HintPath>
diff --git a/Tests/NetworkHelperTests/packages.config b/Tests/NetworkHelperTests/packages.config
index 8d4c5b6..40f9981 100644
--- a/Tests/NetworkHelperTests/packages.config
+++ b/Tests/NetworkHelperTests/packages.config
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.43" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.IO.Streams" version="2.0.0-preview.13" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Text" version="2.0.0-preview.13" 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.Threading" version="2.0.0-preview.9" targetFramework="netnano1.0" />
   <package id="nanoFramework.TestFramework" version="4.0.0-preview.47" targetFramework="netnano1.0" developmentDependency="true" />
 </packages>
\ No newline at end of file
diff --git a/Tests/NetworkHelperTests/packages.lock.json b/Tests/NetworkHelperTests/packages.lock.json
index 0a6029e..3158a58 100644
--- a/Tests/NetworkHelperTests/packages.lock.json
+++ b/Tests/NetworkHelperTests/packages.lock.json
@@ -10,15 +10,15 @@
       },
       "nanoFramework.System.IO.Streams": {
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-        "resolved": "2.0.0-preview.13",
-        "contentHash": "TQLs+6/JdXhhK+pkvx9/iVnHLhTJ2oo7XBusC73lspLbeWlIzGRwrA9ZyQejdXh44URE05neaimJey786hhZlA=="
+        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
+        "resolved": "2.0.0-preview.15",
+        "contentHash": "VjdWLxapAF4hEr0vtJPAFEOY1xT9TyQlAB9wyRfcYmvoHiBIQWB0krgpw0yvC2C1AOLgE9op3HpsFbzrVRw3EA=="
       },
       "nanoFramework.System.Text": {
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-        "requested": "[2.0.0-preview.13, 2.0.0-preview.13]",
-        "resolved": "2.0.0-preview.13",
-        "contentHash": "kTEKvplebAWeA7j4jb9adST6dxH28Q6c99+Jms6p8cMFxlrUoWhL/GdEiPaPnJSVy1XtsgIfh38WbR757qF8yw=="
+        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
+        "resolved": "2.0.0-preview.15",
+        "contentHash": "zhVxQ+zUBkDPhpU35xX9JT/H8bFjo0ylQRmX/45QtM3QJQRd7a327R1PfBhpU5o3kpx2V8AcOgZBM8UilKwQeA=="
       },
       "nanoFramework.System.Threading": {
         "type": "Direct",
diff --git a/Tests/SocketTests/SocketTests.nfproj b/Tests/SocketTests/SocketTests.nfproj
index 8954fa2..40f9e2a 100644
--- a/Tests/SocketTests/SocketTests.nfproj
+++ b/Tests/SocketTests/SocketTests.nfproj
@@ -43,7 +43,7 @@
       <HintPath>..\..\packages\nanoFramework.CoreLibrary.2.0.0-preview.43\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.13\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.System.Text.2.0.0-preview.15\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.TestFramework">
       <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\lib\nanoFramework.TestFramework.dll</HintPath>
@@ -52,7 +52,7 @@
       <HintPath>..\..\packages\nanoFramework.TestFramework.4.0.0-preview.47\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.13\lib\netnano1.0\System.IO.Streams.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.15\lib\netnano1.0\System.IO.Streams.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/Tests/SocketTests/packages.config b/Tests/SocketTests/packages.config
index 3346fc1..d261ae9 100644
--- a/Tests/SocketTests/packages.config
+++ b/Tests/SocketTests/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.43" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.IO.Streams" version="2.0.0-preview.13" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Text" version="2.0.0-preview.13" 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" />
 </packages>
\ No newline at end of file
diff --git a/Tests/SocketTests/packages.lock.json b/Tests/SocketTests/packages.lock.json
index 7770d77..2848678 100644
--- a/Tests/SocketTests/packages.lock.json
+++ b/Tests/SocketTests/packages.lock.json
@@ -10,15 +10,15 @@
       },
       "nanoFramework.System.IO.Streams": {
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-        "resolved": "2.0.0-preview.13",
-        "contentHash": "TQLs+6/JdXhhK+pkvx9/iVnHLhTJ2oo7XBusC73lspLbeWlIzGRwrA9ZyQejdXh44URE05neaimJey786hhZlA=="
+        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
+        "resolved": "2.0.0-preview.15",
+        "contentHash": "VjdWLxapAF4hEr0vtJPAFEOY1xT9TyQlAB9wyRfcYmvoHiBIQWB0krgpw0yvC2C1AOLgE9op3HpsFbzrVRw3EA=="
       },
       "nanoFramework.System.Text": {
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-        "resolved": "2.0.0-preview.13",
-        "contentHash": "kTEKvplebAWeA7j4jb9adST6dxH28Q6c99+Jms6p8cMFxlrUoWhL/GdEiPaPnJSVy1XtsgIfh38WbR757qF8yw=="
+        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
+        "resolved": "2.0.0-preview.15",
+        "contentHash": "zhVxQ+zUBkDPhpU35xX9JT/H8bFjo0ylQRmX/45QtM3QJQRd7a327R1PfBhpU5o3kpx2V8AcOgZBM8UilKwQeA=="
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diff --git a/nanoFramework.System.Net.nuspec b/nanoFramework.System.Net.nuspec
index ad3c698..2ac0eb0 100644
--- a/nanoFramework.System.Net.nuspec
+++ b/nanoFramework.System.Net.nuspec
@@ -22,9 +22,9 @@ This package requires a target with System.Net v$nativeVersion$ (checksum $check
       <group targetFramework=".NETnanoFramework1.0">
         <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.43" />
         <dependency id="nanoFramework.Runtime.Events" version="2.0.0-preview.11" />
-        <dependency id="nanoFramework.System.Text" version="2.0.0-preview.13" />
+        <dependency id="nanoFramework.System.Text" version="2.0.0-preview.15" />
         <dependency id="nanoFramework.System.Threading" version="2.0.0-preview.9" />
-        <dependency id="nanoFramework.System.IO.Streams" version="2.0.0-preview.13" />
+        <dependency id="nanoFramework.System.IO.Streams" version="2.0.0-preview.15" />
       </group>
     </dependencies>
   </metadata>
diff --git a/nanoFramework.System.Net/System.Net.nfproj b/nanoFramework.System.Net/System.Net.nfproj
index 33670a9..f2da22d 100644
--- a/nanoFramework.System.Net/System.Net.nfproj
+++ b/nanoFramework.System.Net/System.Net.nfproj
@@ -139,10 +139,10 @@
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     </Reference>
     <Reference Include="nanoFramework.System.Text, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Text.2.0.0-preview.13\lib\netnano1.0\nanoFramework.System.Text.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Text.2.0.0-preview.15\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.13\lib\netnano1.0\System.IO.Streams.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.15\lib\netnano1.0\System.IO.Streams.dll</HintPath>
     </Reference>
     <Reference Include="System.Threading, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\packages\nanoFramework.System.Threading.2.0.0-preview.9\lib\netnano1.0\System.Threading.dll</HintPath>
diff --git a/nanoFramework.System.Net/packages.config b/nanoFramework.System.Net/packages.config
index 74de5ee..ed84d0c 100644
--- a/nanoFramework.System.Net/packages.config
+++ b/nanoFramework.System.Net/packages.config
@@ -2,8 +2,8 @@
 <packages>
   <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.43" targetFramework="netnano1.0" />
   <package id="nanoFramework.Runtime.Events" version="2.0.0-preview.11" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.IO.Streams" version="2.0.0-preview.13" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Text" version="2.0.0-preview.13" 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.Threading" version="2.0.0-preview.9" 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.Net/packages.lock.json b/nanoFramework.System.Net/packages.lock.json
index 67c45c9..5d43344 100644
--- a/nanoFramework.System.Net/packages.lock.json
+++ b/nanoFramework.System.Net/packages.lock.json
@@ -16,15 +16,15 @@
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+        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
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+        "requested": "[2.0.0-preview.15, 2.0.0-preview.15]",
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