diff --git a/WebSockets.Client/System.Net.WebSockets.Client.nfproj b/WebSockets.Client/System.Net.WebSockets.Client.nfproj
index 7746808..3786843 100644
--- a/WebSockets.Client/System.Net.WebSockets.Client.nfproj
+++ b/WebSockets.Client/System.Net.WebSockets.Client.nfproj
@@ -108,7 +108,7 @@
       <HintPath>..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.22\lib\netnano1.0\System.IO.Streams.dll</HintPath>
     </Reference>
     <Reference Include="System.Net, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Net.2.0.0-preview.37\lib\netnano1.0\System.Net.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Net.2.0.0-preview.39\lib\netnano1.0\System.Net.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.14\lib\netnano1.0\System.Threading.dll</HintPath>
diff --git a/WebSockets.Client/packages.config b/WebSockets.Client/packages.config
index ae86a80..55cad61 100644
--- a/WebSockets.Client/packages.config
+++ b/WebSockets.Client/packages.config
@@ -4,7 +4,7 @@
   <package id="nanoFramework.Runtime.Events" version="2.0.0-preview.13" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Collections" version="2.0.0-preview.15" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.IO.Streams" version="2.0.0-preview.22" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Net" version="2.0.0-preview.37" targetFramework="netnano1.0" />
+  <package id="nanoFramework.System.Net" version="2.0.0-preview.39" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Text" version="2.0.0-preview.23" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Threading" version="2.0.0-preview.14" targetFramework="netnano1.0" />
   <package id="Nerdbank.GitVersioning" version="3.10.94" targetFramework="netnano1.0" developmentDependency="true" />
diff --git a/WebSockets.Client/packages.lock.json b/WebSockets.Client/packages.lock.json
index 1571e7b..0115a81 100644
--- a/WebSockets.Client/packages.lock.json
+++ b/WebSockets.Client/packages.lock.json
@@ -28,9 +28,9 @@
       },
       "nanoFramework.System.Net": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.37, 2.0.0-preview.37]",
-        "resolved": "2.0.0-preview.37",
-        "contentHash": "4jJRtwgyxciviaX8NzwQOg9pUBM1JHcKfzqThFauAsitAHXhf+vgMQJYt1894rOyihOwWwwvDjmsOqJPNFD/ZQ=="
+        "requested": "[2.0.0-preview.39, 2.0.0-preview.39]",
+        "resolved": "2.0.0-preview.39",
+        "contentHash": "XbvsoqFvWPQp4LlACnLvURrbfZNwK5Fk7gzUgxwnDDuU49f1TgG89Z/526MWnJ3i1sm/kRJnOROgDXhQvnyecg=="
       },
       "nanoFramework.System.Text": {
         "type": "Direct",
diff --git a/WebSockets.Server/System.Net.WebSockets.Server.nfproj b/WebSockets.Server/System.Net.WebSockets.Server.nfproj
index e5b4f39..c705e1f 100644
--- a/WebSockets.Server/System.Net.WebSockets.Server.nfproj
+++ b/WebSockets.Server/System.Net.WebSockets.Server.nfproj
@@ -111,10 +111,10 @@
       <HintPath>..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.22\lib\netnano1.0\System.IO.Streams.dll</HintPath>
     </Reference>
     <Reference Include="System.Net, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Net.2.0.0-preview.37\lib\netnano1.0\System.Net.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Net.2.0.0-preview.39\lib\netnano1.0\System.Net.dll</HintPath>
     </Reference>
     <Reference Include="System.Net.Http, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Net.Http.2.0.0-preview.20\lib\System.Net.Http.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Net.Http.2.0.0-preview.21\lib\System.Net.Http.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.14\lib\netnano1.0\System.Threading.dll</HintPath>
diff --git a/WebSockets.Server/packages.config b/WebSockets.Server/packages.config
index cd4c8b7..b1171b1 100644
--- a/WebSockets.Server/packages.config
+++ b/WebSockets.Server/packages.config
@@ -4,8 +4,8 @@
   <package id="nanoFramework.Runtime.Events" version="2.0.0-preview.13" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Collections" version="2.0.0-preview.15" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.IO.Streams" version="2.0.0-preview.22" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Net" version="2.0.0-preview.37" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Net.Http" version="2.0.0-preview.20" targetFramework="netnano1.0" />
+  <package id="nanoFramework.System.Net" version="2.0.0-preview.39" targetFramework="netnano1.0" />
+  <package id="nanoFramework.System.Net.Http" version="2.0.0-preview.21" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Text" version="2.0.0-preview.23" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Threading" version="2.0.0-preview.14" targetFramework="netnano1.0" />
   <package id="Nerdbank.GitVersioning" version="3.10.94" targetFramework="netnano1.0" developmentDependency="true" />
diff --git a/WebSockets.Server/packages.lock.json b/WebSockets.Server/packages.lock.json
index b4fb180..a2b32af 100644
--- a/WebSockets.Server/packages.lock.json
+++ b/WebSockets.Server/packages.lock.json
@@ -28,15 +28,15 @@
       },
       "nanoFramework.System.Net": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.37, 2.0.0-preview.37]",
-        "resolved": "2.0.0-preview.37",
-        "contentHash": "4jJRtwgyxciviaX8NzwQOg9pUBM1JHcKfzqThFauAsitAHXhf+vgMQJYt1894rOyihOwWwwvDjmsOqJPNFD/ZQ=="
+        "requested": "[2.0.0-preview.39, 2.0.0-preview.39]",
+        "resolved": "2.0.0-preview.39",
+        "contentHash": "XbvsoqFvWPQp4LlACnLvURrbfZNwK5Fk7gzUgxwnDDuU49f1TgG89Z/526MWnJ3i1sm/kRJnOROgDXhQvnyecg=="
       },
       "nanoFramework.System.Net.Http": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.20, 2.0.0-preview.20]",
-        "resolved": "2.0.0-preview.20",
-        "contentHash": "a7T/Kdp1dW/sM+lzOOpJDrZdBztO1MFb18jyvcsb/YwfarXyyneFk/IVvCIOXpe3T5DnhjwF0/syckyCXB6jBw=="
+        "requested": "[2.0.0-preview.21, 2.0.0-preview.21]",
+        "resolved": "2.0.0-preview.21",
+        "contentHash": "pe/zYhCavASUfUQyH1dqn+E9yAB63GX4e3mfcj77CQHCUFwKH82PmVxOx24UNs4I148GrNIRu5cK5YnNf66tWA=="
       },
       "nanoFramework.System.Text": {
         "type": "Direct",
diff --git a/WebSockets/System.Net.WebSockets.nfproj b/WebSockets/System.Net.WebSockets.nfproj
index 3f4e680..48abe8e 100644
--- a/WebSockets/System.Net.WebSockets.nfproj
+++ b/WebSockets/System.Net.WebSockets.nfproj
@@ -79,10 +79,10 @@
       <HintPath>..\packages\nanoFramework.System.IO.Streams.2.0.0-preview.22\lib\netnano1.0\System.IO.Streams.dll</HintPath>
     </Reference>
     <Reference Include="System.Net, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Net.2.0.0-preview.37\lib\netnano1.0\System.Net.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Net.2.0.0-preview.39\lib\netnano1.0\System.Net.dll</HintPath>
     </Reference>
     <Reference Include="System.Net.Http, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Net.Http.2.0.0-preview.20\lib\System.Net.Http.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Net.Http.2.0.0-preview.21\lib\System.Net.Http.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.14\lib\netnano1.0\System.Threading.dll</HintPath>
diff --git a/WebSockets/packages.config b/WebSockets/packages.config
index cd4c8b7..b1171b1 100644
--- a/WebSockets/packages.config
+++ b/WebSockets/packages.config
@@ -4,8 +4,8 @@
   <package id="nanoFramework.Runtime.Events" version="2.0.0-preview.13" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Collections" version="2.0.0-preview.15" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.IO.Streams" version="2.0.0-preview.22" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Net" version="2.0.0-preview.37" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Net.Http" version="2.0.0-preview.20" targetFramework="netnano1.0" />
+  <package id="nanoFramework.System.Net" version="2.0.0-preview.39" targetFramework="netnano1.0" />
+  <package id="nanoFramework.System.Net.Http" version="2.0.0-preview.21" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Text" version="2.0.0-preview.23" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Threading" version="2.0.0-preview.14" targetFramework="netnano1.0" />
   <package id="Nerdbank.GitVersioning" version="3.10.94" targetFramework="netnano1.0" developmentDependency="true" />
diff --git a/WebSockets/packages.lock.json b/WebSockets/packages.lock.json
index b4fb180..a2b32af 100644
--- a/WebSockets/packages.lock.json
+++ b/WebSockets/packages.lock.json
@@ -28,15 +28,15 @@
       },
       "nanoFramework.System.Net": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.37, 2.0.0-preview.37]",
-        "resolved": "2.0.0-preview.37",
-        "contentHash": "4jJRtwgyxciviaX8NzwQOg9pUBM1JHcKfzqThFauAsitAHXhf+vgMQJYt1894rOyihOwWwwvDjmsOqJPNFD/ZQ=="
+        "requested": "[2.0.0-preview.39, 2.0.0-preview.39]",
+        "resolved": "2.0.0-preview.39",
+        "contentHash": "XbvsoqFvWPQp4LlACnLvURrbfZNwK5Fk7gzUgxwnDDuU49f1TgG89Z/526MWnJ3i1sm/kRJnOROgDXhQvnyecg=="
       },
       "nanoFramework.System.Net.Http": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.20, 2.0.0-preview.20]",
-        "resolved": "2.0.0-preview.20",
-        "contentHash": "a7T/Kdp1dW/sM+lzOOpJDrZdBztO1MFb18jyvcsb/YwfarXyyneFk/IVvCIOXpe3T5DnhjwF0/syckyCXB6jBw=="
+        "requested": "[2.0.0-preview.21, 2.0.0-preview.21]",
+        "resolved": "2.0.0-preview.21",
+        "contentHash": "pe/zYhCavASUfUQyH1dqn+E9yAB63GX4e3mfcj77CQHCUFwKH82PmVxOx24UNs4I148GrNIRu5cK5YnNf66tWA=="
       },
       "nanoFramework.System.Text": {
         "type": "Direct",
diff --git a/nanoframework.System.Net.WebSockets.Client.nuspec b/nanoframework.System.Net.WebSockets.Client.nuspec
index b0cecd4..a344871 100644
--- a/nanoframework.System.Net.WebSockets.Client.nuspec
+++ b/nanoframework.System.Net.WebSockets.Client.nuspec
@@ -22,7 +22,7 @@ There are also two other packages, one with the server API only and another with
       <group targetFramework=".NETnanoFramework1.0">
         <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.52" />
         <dependency id="nanoFramework.System.Collections" version="2.0.0-preview.15" />
-        <dependency id="nanoFramework.System.Net" version="2.0.0-preview.37" />
+        <dependency id="nanoFramework.System.Net" version="2.0.0-preview.39" />
       </group>
     </dependencies>
   </metadata>
diff --git a/nanoframework.System.Net.WebSockets.Server.nuspec b/nanoframework.System.Net.WebSockets.Server.nuspec
index 8134689..e584d0d 100644
--- a/nanoframework.System.Net.WebSockets.Server.nuspec
+++ b/nanoframework.System.Net.WebSockets.Server.nuspec
@@ -21,7 +21,7 @@ There are also two other packages, one with the client API only and another with
     <dependencies>
       <group targetFramework=".NETnanoFramework1.0">
         <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.52" />
-        <dependency id="nanoFramework.System.Net.Http" version="2.0.0-preview.20" />
+        <dependency id="nanoFramework.System.Net.Http" version="2.0.0-preview.21" />
       </group>
     </dependencies>
   </metadata>
diff --git a/nanoframework.System.Net.WebSockets.nuspec b/nanoframework.System.Net.WebSockets.nuspec
index 78c4fb3..3f25cb2 100644
--- a/nanoframework.System.Net.WebSockets.nuspec
+++ b/nanoframework.System.Net.WebSockets.nuspec
@@ -22,7 +22,7 @@ These are meant to be used when there is the need to use smaller assemblies.</de
     <dependencies>
       <group targetFramework=".NETnanoFramework1.0">
         <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.52" />
-        <dependency id="nanoFramework.System.Net.Http" version="2.0.0-preview.20" />
+        <dependency id="nanoFramework.System.Net.Http" version="2.0.0-preview.21" />
       </group>
     </dependencies>
   </metadata>