diff --git a/M2Mqtt/nanoFramework.M2Mqtt.nfproj b/M2Mqtt/nanoFramework.M2Mqtt.nfproj
index 727fe7f0..db38defc 100644
--- a/M2Mqtt/nanoFramework.M2Mqtt.nfproj
+++ b/M2Mqtt/nanoFramework.M2Mqtt.nfproj
@@ -80,14 +80,12 @@
       <SpecificVersion>True</SpecificVersion>
     </Reference>
     <Reference Include="nanoFramework.System.Collections, Version=1.2.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Collections.1.2.0-preview.36\lib\nanoFramework.System.Collections.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Collections.1.2.0-preview.39\lib\nanoFramework.System.Collections.dll</HintPath>
       <Private>True</Private>
-      <SpecificVersion>True</SpecificVersion>
     </Reference>
     <Reference Include="nanoFramework.System.Text, Version=1.1.1.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Text.1.1.1-preview.35\lib\nanoFramework.System.Text.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Text.1.1.1-preview.40\lib\nanoFramework.System.Text.dll</HintPath>
       <Private>True</Private>
-      <SpecificVersion>True</SpecificVersion>
     </Reference>
     <Reference Include="System.Net, Version=1.6.5.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\packages\nanoFramework.System.Net.1.6.5-preview.2\lib\System.Net.dll</HintPath>
@@ -110,4 +108,4 @@
     </PropertyGroup>
     <Error Condition="!Exists('..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets'))" />
   </Target>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/M2Mqtt/nanoFramework.M2Mqtt.nuspec b/M2Mqtt/nanoFramework.M2Mqtt.nuspec
index 26bb1238..f448d742 100644
--- a/M2Mqtt/nanoFramework.M2Mqtt.nuspec
+++ b/M2Mqtt/nanoFramework.M2Mqtt.nuspec
@@ -21,9 +21,9 @@
       <dependency id="nanoFramework.CoreLibrary" version="1.10.3-preview.7" />
       <dependency id="nanoFramework.Runtime.Events" version="1.9.0-preview.16" />
       <dependency id="nanoFramework.Runtime.Native" version="1.5.1-preview.32" />
-      <dependency id="nanoFramework.System.Collections" version="1.2.0-preview.36" />
+      <dependency id="nanoFramework.System.Collections" version="1.2.0-preview.39" />
       <dependency id="nanoFramework.System.Net" version="1.6.5-preview.2" />
-      <dependency id="nanoFramework.System.Text" version="1.1.1-preview.35" />
+      <dependency id="nanoFramework.System.Text" version="1.1.1-preview.40" />
     </dependencies>
   </metadata>
   <files>
@@ -32,7 +32,6 @@
     <file src="bin\Release\nanoFramework.M2Mqtt.pdbx" target="lib\nanoFramework.M2Mqtt.pdbx" />
     <file src="bin\Release\nanoFramework.M2Mqtt.pe" target="lib\nanoFramework.M2Mqtt.pe" />
     <file src="bin\Release\nanoFramework.M2Mqtt.xml" target="lib\nanoFramework.M2Mqtt.xml" />
-    
     <file src="..\assets\readme.txt" target="" />
     <file src="..\assets\nf-logo.png" target="images\" />
     <file src="..\LICENSE.md" target="" />
diff --git a/M2Mqtt/packages.config b/M2Mqtt/packages.config
index bf9ff1d6..65522634 100644
--- a/M2Mqtt/packages.config
+++ b/M2Mqtt/packages.config
@@ -3,8 +3,8 @@
   <package id="nanoFramework.CoreLibrary" version="1.10.3-preview.7" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Runtime.Events" version="1.9.0-preview.16" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Runtime.Native" version="1.5.1-preview.32" targetFramework="netnanoframework10" />
-  <package id="nanoFramework.System.Collections" version="1.2.0-preview.36" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Collections" version="1.2.0-preview.39" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Net" version="1.6.5-preview.2" targetFramework="netnanoframework10" />
-  <package id="nanoFramework.System.Text" version="1.1.1-preview.35" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Text" version="1.1.1-preview.40" targetFramework="netnanoframework10" />
   <package id="Nerdbank.GitVersioning" version="3.3.37" developmentDependency="true" targetFramework="netnanoframework10" />
 </packages>
\ No newline at end of file
diff --git a/TestMqtt/Mosquito.TemperatureGauge/Mosquito.TemperatureGauge.nfproj b/TestMqtt/Mosquito.TemperatureGauge/Mosquito.TemperatureGauge.nfproj
index 3b15bc59..99d8dfd5 100644
--- a/TestMqtt/Mosquito.TemperatureGauge/Mosquito.TemperatureGauge.nfproj
+++ b/TestMqtt/Mosquito.TemperatureGauge/Mosquito.TemperatureGauge.nfproj
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup Label="Globals">
     <NanoFrameworkProjectSystemPath>$(MSBuildToolsPath)..\..\..\nanoFramework\v1.0\</NanoFrameworkProjectSystemPath>
@@ -38,11 +38,11 @@
       <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.System.Collections, Version=1.2.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.System.Collections.1.2.0-preview.36\lib\nanoFramework.System.Collections.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Collections.1.2.0-preview.39\lib\nanoFramework.System.Collections.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.System.Text, Version=1.1.1.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.System.Text.1.1.1-preview.35\lib\nanoFramework.System.Text.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Text.1.1.1-preview.40\lib\nanoFramework.System.Text.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System.Net, Version=1.6.5.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
diff --git a/TestMqtt/Mosquito.TemperatureGauge/packages.config b/TestMqtt/Mosquito.TemperatureGauge/packages.config
index 888dfb8b..daa62d6b 100644
--- a/TestMqtt/Mosquito.TemperatureGauge/packages.config
+++ b/TestMqtt/Mosquito.TemperatureGauge/packages.config
@@ -3,7 +3,7 @@
   <package id="nanoFramework.CoreLibrary" version="1.10.3-preview.7" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Runtime.Events" version="1.9.0-preview.16" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Runtime.Native" version="1.5.1-preview.32" targetFramework="netnanoframework10" />
-  <package id="nanoFramework.System.Collections" version="1.2.0-preview.36" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Collections" version="1.2.0-preview.39" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Net" version="1.6.5-preview.2" targetFramework="netnanoframework10" />
-  <package id="nanoFramework.System.Text" version="1.1.1-preview.35" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Text" version="1.1.1-preview.40" targetFramework="netnanoframework10" />
 </packages>
\ No newline at end of file