diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index f695ab7f0a91..75ea085407c0 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -9,9 +9,9 @@
 -->
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.AspNetCore.Blazor.Mono" Version="3.1.0-preview1.19503.1">
+    <Dependency Name="Microsoft.AspNetCore.Blazor.Mono" Version="3.1.0-preview2.19480.4">
       <Uri>https://github.com/aspnet/Blazor</Uri>
-      <Sha>bf49a4e1a5401c0e952147f1c7452261a058813d</Sha>
+      <Sha>a5b95c69834fff863dbca69e8c7e60d0f08a8e2a</Sha>
     </Dependency>
     <Dependency Name="Microsoft.AspNetCore.Razor.Language" Version="3.1.0-preview1.19506.2">
       <Uri>https://github.com/aspnet/AspNetCore-Tooling</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index 1c4650b6c0d0..210ef29e3988 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -91,7 +91,7 @@
     <!-- Only listed explicitly to workaround https://github.com/dotnet/cli/issues/10528 -->
     <MicrosoftNETCorePlatformsPackageVersion>3.1.0-preview1.19504.10</MicrosoftNETCorePlatformsPackageVersion>
     <!-- Packages from aspnet/Blazor -->
-    <MicrosoftAspNetCoreBlazorMonoPackageVersion>3.1.0-preview1.19503.1</MicrosoftAspNetCoreBlazorMonoPackageVersion>
+    <MicrosoftAspNetCoreBlazorMonoPackageVersion>3.1.0-preview2.19480.4</MicrosoftAspNetCoreBlazorMonoPackageVersion>
     <!-- Packages from aspnet/Extensions -->
     <InternalAspNetCoreAnalyzersPackageVersion>3.1.0-preview1.19506.1</InternalAspNetCoreAnalyzersPackageVersion>
     <MicrosoftAspNetCoreAnalyzerTestingPackageVersion>3.1.0-preview1.19506.1</MicrosoftAspNetCoreAnalyzerTestingPackageVersion>