diff --git a/Tests/SerializationTests/SerializationTests.nfproj b/Tests/SerializationTests/SerializationTests.nfproj
index b209693..ecf6898 100644
--- a/Tests/SerializationTests/SerializationTests.nfproj
+++ b/Tests/SerializationTests/SerializationTests.nfproj
@@ -38,16 +38,16 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
-    <Reference Include="mscorlib, Version=1.14.3.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.CoreLibrary.1.14.2\lib\mscorlib.dll</HintPath>
+    <Reference Include="mscorlib, Version=1.15.6.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+      <HintPath>..\..\packages\nanoFramework.CoreLibrary.1.15.5\lib\mscorlib.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="nanoFramework.TestFramework, Version=2.1.85.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.TestFramework.2.1.85\lib\nanoFramework.TestFramework.dll</HintPath>
+    <Reference Include="nanoFramework.TestFramework, Version=2.1.87.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+      <HintPath>..\..\packages\nanoFramework.TestFramework.2.1.87\lib\nanoFramework.TestFramework.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.UnitTestLauncher, Version=0.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.TestFramework.2.1.85\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
+      <HintPath>..\..\packages\nanoFramework.TestFramework.2.1.87\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
       <Private>True</Private>
     </Reference>
   </ItemGroup>
diff --git a/Tests/SerializationTests/packages.config b/Tests/SerializationTests/packages.config
index 7704bd8..9af75e9 100644
--- a/Tests/SerializationTests/packages.config
+++ b/Tests/SerializationTests/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="nanoFramework.CoreLibrary" version="1.14.2" targetFramework="netnano1.0" />
-  <package id="nanoFramework.TestFramework" version="2.1.85" targetFramework="netnano1.0" developmentDependency="true" />
+  <package id="nanoFramework.CoreLibrary" version="1.15.5" targetFramework="netnano1.0" />
+  <package id="nanoFramework.TestFramework" version="2.1.87" targetFramework="netnano1.0" developmentDependency="true" />
 </packages>
\ No newline at end of file
diff --git a/Tests/SerializationTests/packages.lock.json b/Tests/SerializationTests/packages.lock.json
index a933330..2215522 100644
--- a/Tests/SerializationTests/packages.lock.json
+++ b/Tests/SerializationTests/packages.lock.json
@@ -4,15 +4,15 @@
     ".NETnanoFramework,Version=v1.0": {
       "nanoFramework.CoreLibrary": {
         "type": "Direct",
-        "requested": "[1.14.2, 1.14.2]",
-        "resolved": "1.14.2",
-        "contentHash": "j1mrz4mitl5LItvmHMsw1aHzCAfvTTgIkRxA0mhs5mSpctJ/BBcuNwua5j3MspfRNKreCQPy/qZy/D9ADLL/PA=="
+        "requested": "[1.15.5, 1.15.5]",
+        "resolved": "1.15.5",
+        "contentHash": "u2+GvAp1uxLrGdILACAZy+EVKOs28EQ52j8Lz7599egXZ3GBGejjnR2ofhjMQwzrJLlgtyrsx8nSLngDfJNsAg=="
       },
       "nanoFramework.TestFramework": {
         "type": "Direct",
-        "requested": "[2.1.85, 2.1.85]",
-        "resolved": "2.1.85",
-        "contentHash": "UAydT9MgZfufPcLpn5KbFZkR3ul6zSt9ERYDPDen7IWxeT+fGpRTes8QTWfhgMsxF3E27b3wI6K6wwWQkeGuFQ=="
+        "requested": "[2.1.87, 2.1.87]",
+        "resolved": "2.1.87",
+        "contentHash": "58nW0UByML7fciTfvLfaEwysf6319SQWmah9v6N3xF9E7jWiHnh3FfEN/wtP/E2wwufmiFZAO2CidbiuEEJmKA=="
       }
     }
   }
diff --git a/nanoFramework.System.Runtime.Serialization.nuspec b/nanoFramework.System.Runtime.Serialization.nuspec
index cffc4f3..dbfd1a3 100644
--- a/nanoFramework.System.Runtime.Serialization.nuspec
+++ b/nanoFramework.System.Runtime.Serialization.nuspec
@@ -19,7 +19,7 @@
 This package requires a target with nanoFramework.System.Runtime.Serialization v$nativeVersion$ (checksum $checksum$).</description>
     <tags>nanoFramework C# csharp netmf netnf nanoFramework.System.Runtime.Serialization</tags>
     <dependencies>
-      <dependency id="nanoFramework.CoreLibrary" version="1.14.2" />
+      <dependency id="nanoFramework.CoreLibrary" version="1.15.5" />
     </dependencies>
   </metadata>
   <files>
diff --git a/nanoFramework.System.Runtime.Serialization/System.Runtime.Serialization.nfproj b/nanoFramework.System.Runtime.Serialization/System.Runtime.Serialization.nfproj
index 0ac92c4..787e46e 100644
--- a/nanoFramework.System.Runtime.Serialization/System.Runtime.Serialization.nfproj
+++ b/nanoFramework.System.Runtime.Serialization/System.Runtime.Serialization.nfproj
@@ -57,8 +57,8 @@
     <Content Include="packages.lock.json" />
   </ItemGroup>
   <ItemGroup>
-    <Reference Include="mscorlib, Version=1.14.3.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.CoreLibrary.1.14.2\lib\mscorlib.dll</HintPath>
+    <Reference Include="mscorlib, Version=1.15.6.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+      <HintPath>..\packages\nanoFramework.CoreLibrary.1.15.5\lib\mscorlib.dll</HintPath>
       <Private>True</Private>
     </Reference>
   </ItemGroup>
diff --git a/nanoFramework.System.Runtime.Serialization/packages.config b/nanoFramework.System.Runtime.Serialization/packages.config
index fc766fb..85fbf3b 100644
--- a/nanoFramework.System.Runtime.Serialization/packages.config
+++ b/nanoFramework.System.Runtime.Serialization/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="nanoFramework.CoreLibrary" version="1.14.2" targetFramework="netnano1.0" />
+  <package id="nanoFramework.CoreLibrary" version="1.15.5" targetFramework="netnano1.0" />
   <package id="Nerdbank.GitVersioning" version="3.6.133" targetFramework="netnano1.0" developmentDependency="true" />
 </packages>
\ No newline at end of file
diff --git a/nanoFramework.System.Runtime.Serialization/packages.lock.json b/nanoFramework.System.Runtime.Serialization/packages.lock.json
index b80edcb..33ef693 100644
--- a/nanoFramework.System.Runtime.Serialization/packages.lock.json
+++ b/nanoFramework.System.Runtime.Serialization/packages.lock.json
@@ -4,9 +4,9 @@
     ".NETnanoFramework,Version=v1.0": {
       "nanoFramework.CoreLibrary": {
         "type": "Direct",
-        "requested": "[1.14.2, 1.14.2]",
-        "resolved": "1.14.2",
-        "contentHash": "j1mrz4mitl5LItvmHMsw1aHzCAfvTTgIkRxA0mhs5mSpctJ/BBcuNwua5j3MspfRNKreCQPy/qZy/D9ADLL/PA=="
+        "requested": "[1.15.5, 1.15.5]",
+        "resolved": "1.15.5",
+        "contentHash": "u2+GvAp1uxLrGdILACAZy+EVKOs28EQ52j8Lz7599egXZ3GBGejjnR2ofhjMQwzrJLlgtyrsx8nSLngDfJNsAg=="
       },
       "Nerdbank.GitVersioning": {
         "type": "Direct",