diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 583aa22531..3d63779ccd 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -13,9 +13,9 @@
       <Uri>https://github.com/dotnet/blazor</Uri>
       <Sha>7659b5fda2406d854c72436bdc24f1ff958995f8</Sha>
     </Dependency>
-    <Dependency Name="System.Net.Http.Json" Version="3.2.0-preview4.20177.1">
+    <Dependency Name="System.Net.Http.Json" Version="3.2.0-preview5.20210.3">
       <Uri>https://github.com/dotnet/corefx</Uri>
-      <Sha>b3f1f8f7f3c6549bd7f632bb948835f785835548</Sha>
+      <Sha>557f293f3469cb64a4f3d06b6941b387e44df2d2</Sha>
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>
diff --git a/eng/Versions.props b/eng/Versions.props
index 5842e45729..9874b0a1e7 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -93,7 +93,7 @@
     <SystemServiceProcessServiceControllerPackageVersion>4.7.0</SystemServiceProcessServiceControllerPackageVersion>
     <SystemTextEncodingsWebPackageVersion>4.7.0</SystemTextEncodingsWebPackageVersion>
     <SystemTextJsonPackageVersion>4.7.1</SystemTextJsonPackageVersion>
-    <SystemNetHttpJsonPackageVersion>3.2.0-preview4.20177.1</SystemNetHttpJsonPackageVersion>
+    <SystemNetHttpJsonPackageVersion>3.2.0-preview5.20210.3</SystemNetHttpJsonPackageVersion>
     <SystemThreadingChannelsPackageVersion>4.7.0</SystemThreadingChannelsPackageVersion>
     <SystemWindowsExtensionsPackageVersion>4.7.0</SystemWindowsExtensionsPackageVersion>
     <!-- Only listed explicitly to workaround https://github.com/dotnet/cli/issues/10528 -->