diff --git a/System.IO.Streams/System.IO.Streams.nfproj b/System.IO.Streams/System.IO.Streams.nfproj
index 996c9fb..64b04d2 100644
--- a/System.IO.Streams/System.IO.Streams.nfproj
+++ b/System.IO.Streams/System.IO.Streams.nfproj
@@ -57,7 +57,7 @@
       <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>
   </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />
diff --git a/System.IO.Streams/packages.config b/System.IO.Streams/packages.config
index 04eadf7..0463855 100644
--- a/System.IO.Streams/packages.config
+++ b/System.IO.Streams/packages.config
@@ -1,6 +1,6 @@
 <?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.Text" version="2.0.0-preview.15" 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.Streams/packages.lock.json b/System.IO.Streams/packages.lock.json
index 16aeb74..f8c04e1 100644
--- a/System.IO.Streams/packages.lock.json
+++ b/System.IO.Streams/packages.lock.json
@@ -10,9 +10,9 @@
       },
       "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/UnitTests/MemoryStreamUnitTests/MemoryStreamUnitTests.nfproj b/UnitTests/MemoryStreamUnitTests/MemoryStreamUnitTests.nfproj
index 2f1c9e3..f8a763e 100644
--- a/UnitTests/MemoryStreamUnitTests/MemoryStreamUnitTests.nfproj
+++ b/UnitTests/MemoryStreamUnitTests/MemoryStreamUnitTests.nfproj
@@ -50,7 +50,7 @@
       <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>
diff --git a/UnitTests/MemoryStreamUnitTests/packages.config b/UnitTests/MemoryStreamUnitTests/packages.config
index 70dcb1c..d6501bb 100644
--- a/UnitTests/MemoryStreamUnitTests/packages.config
+++ b/UnitTests/MemoryStreamUnitTests/packages.config
@@ -1,6 +1,6 @@
 <?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.Text" version="2.0.0-preview.15" 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/UnitTests/MemoryStreamUnitTests/packages.lock.json b/UnitTests/MemoryStreamUnitTests/packages.lock.json
index 28bfa3a..2f3091e 100644
--- a/UnitTests/MemoryStreamUnitTests/packages.lock.json
+++ b/UnitTests/MemoryStreamUnitTests/packages.lock.json
@@ -10,9 +10,9 @@
       },
       "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/UnitTests/StreamReaderWriterUnitTests/StreamReaderWriterUnitTests.nfproj b/UnitTests/StreamReaderWriterUnitTests/StreamReaderWriterUnitTests.nfproj
index ff89733..d5a2a22 100644
--- a/UnitTests/StreamReaderWriterUnitTests/StreamReaderWriterUnitTests.nfproj
+++ b/UnitTests/StreamReaderWriterUnitTests/StreamReaderWriterUnitTests.nfproj
@@ -35,7 +35,7 @@
       <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>
diff --git a/UnitTests/StreamReaderWriterUnitTests/packages.config b/UnitTests/StreamReaderWriterUnitTests/packages.config
index 70dcb1c..d6501bb 100644
--- a/UnitTests/StreamReaderWriterUnitTests/packages.config
+++ b/UnitTests/StreamReaderWriterUnitTests/packages.config
@@ -1,6 +1,6 @@
 <?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.Text" version="2.0.0-preview.15" 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/UnitTests/StreamReaderWriterUnitTests/packages.lock.json b/UnitTests/StreamReaderWriterUnitTests/packages.lock.json
index 28bfa3a..2f3091e 100644
--- a/UnitTests/StreamReaderWriterUnitTests/packages.lock.json
+++ b/UnitTests/StreamReaderWriterUnitTests/packages.lock.json
@@ -10,9 +10,9 @@
       },
       "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/nanoFramework.System.IO.Streams.nuspec b/nanoFramework.System.IO.Streams.nuspec
index ac44a29..21a5abc 100644
--- a/nanoFramework.System.IO.Streams.nuspec
+++ b/nanoFramework.System.IO.Streams.nuspec
@@ -20,7 +20,7 @@
     <dependencies>
       <group targetFramework=".NETnanoFramework1.0">
         <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.49" />
-        <dependency id="nanoFramework.System.Text" version="2.0.0-preview.15" />
+        <dependency id="nanoFramework.System.Text" version="2.0.0-preview.18" />
       </group>
     </dependencies>
   </metadata>