diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index d42b397876..5703bac680 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -9,9 +9,9 @@
 -->
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.AspNetCore.Blazor.Mono" Version="3.0.0-preview9.19462.2">
+    <Dependency Name="Microsoft.AspNetCore.Blazor.Mono" Version="3.1.0-preview1.19503.1">
       <Uri>https://github.com/aspnet/Blazor</Uri>
-      <Sha>348e050ecd9bd8924581afb677089ae5e2d5e508</Sha>
+      <Sha>bf49a4e1a5401c0e952147f1c7452261a058813d</Sha>
     </Dependency>
     <Dependency Name="Microsoft.AspNetCore.Razor.Language" Version="3.1.0-preview1.19502.3">
       <Uri>https://github.com/aspnet/AspNetCore-Tooling</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index 1653709716..73d4a2a63d 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-preview1.19501.8</MicrosoftNETCorePlatformsPackageVersion>
     <!-- Packages from aspnet/Blazor -->
-    <MicrosoftAspNetCoreBlazorMonoPackageVersion>3.0.0-preview9.19462.2</MicrosoftAspNetCoreBlazorMonoPackageVersion>
+    <MicrosoftAspNetCoreBlazorMonoPackageVersion>3.1.0-preview1.19503.1</MicrosoftAspNetCoreBlazorMonoPackageVersion>
     <!-- Packages from aspnet/Extensions -->
     <InternalAspNetCoreAnalyzersPackageVersion>3.1.0-preview1.19502.5</InternalAspNetCoreAnalyzersPackageVersion>
     <MicrosoftAspNetCoreAnalyzerTestingPackageVersion>3.1.0-preview1.19502.5</MicrosoftAspNetCoreAnalyzerTestingPackageVersion>