diff --git a/nanoFramework.System.Math.Benchmark/nanoFramework.System.Math.Benchmark.nfproj b/nanoFramework.System.Math.Benchmark/nanoFramework.System.Math.Benchmark.nfproj
index 6efd710..b67f3fe 100644
--- a/nanoFramework.System.Math.Benchmark/nanoFramework.System.Math.Benchmark.nfproj
+++ b/nanoFramework.System.Math.Benchmark/nanoFramework.System.Math.Benchmark.nfproj
@@ -51,7 +51,7 @@
       <HintPath>..\packages\nanoFramework.System.Text.2.0.0-preview.8\lib\nanoFramework.System.Text.dll</HintPath>
     </Reference>
     <Reference Include="System.Diagnostics.Stopwatch, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Diagnostics.Stopwatch.2.0.0-preview.3\lib\System.Diagnostics.Stopwatch.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Diagnostics.Stopwatch.2.0.0-preview.4\lib\System.Diagnostics.Stopwatch.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/nanoFramework.System.Math.Benchmark/packages.config b/nanoFramework.System.Math.Benchmark/packages.config
index a26233a..e8c5432 100644
--- a/nanoFramework.System.Math.Benchmark/packages.config
+++ b/nanoFramework.System.Math.Benchmark/packages.config
@@ -5,6 +5,6 @@
   <package id="nanoFramework.Logging" version="1.1.161" targetFramework="netnano1.0" />
   <package id="nanoFramework.Runtime.Native" version="2.0.0-preview.20" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Collections" version="2.0.0-preview.8" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Diagnostics.Stopwatch" version="2.0.0-preview.3" targetFramework="netnano1.0" />
+  <package id="nanoFramework.System.Diagnostics.Stopwatch" version="2.0.0-preview.4" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Text" version="2.0.0-preview.8" targetFramework="netnano1.0" />
 </packages>
\ No newline at end of file
diff --git a/nanoFramework.System.Math.Benchmark/packages.lock.json b/nanoFramework.System.Math.Benchmark/packages.lock.json
index 91cca24..890870f 100644
--- a/nanoFramework.System.Math.Benchmark/packages.lock.json
+++ b/nanoFramework.System.Math.Benchmark/packages.lock.json
@@ -34,9 +34,9 @@
       },
       "nanoFramework.System.Diagnostics.Stopwatch": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.3, 2.0.0-preview.3]",
-        "resolved": "2.0.0-preview.3",
-        "contentHash": "2esmFjGqyiuplp/RHaUAzBH8OSYLopTlpbiTyqNMG99ElYEyuwrP7dHqHnc+YOI5hWPZRxrTB1stfJ7VGlv/8A=="
+        "requested": "[2.0.0-preview.4, 2.0.0-preview.4]",
+        "resolved": "2.0.0-preview.4",
+        "contentHash": "jeP7YdYQq7DVtlE5vqZgRq2n/96HZFZUwEfZWXjSuFJ1Apqpl+lidB+AJ/6DN6P7VEwT6CXYTlHBv0vfCKbNNQ=="
       },
       "nanoFramework.System.Text": {
         "type": "Direct",