diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 17b138ce27..476e61b48f 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-preview3.19531.1">
+    <Dependency Name="Microsoft.AspNetCore.Blazor.Mono" Version="3.1.0-preview4.19562.1">
       <Uri>https://github.com/aspnet/Blazor</Uri>
-      <Sha>df77420cad90b1834fe43c952861dad11097d38f</Sha>
+      <Sha>c8cc48b96c4ef3405dfc1678b089650aec2845ff</Sha>
     </Dependency>
     <Dependency Name="Microsoft.AspNetCore.Razor.Language" Version="3.1.0-preview3.19561.9">
       <Uri>https://github.com/aspnet/AspNetCore-Tooling</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index 0e656cd135..6d5f96791f 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -96,7 +96,7 @@
     <!-- Only listed explicitly to workaround https://github.com/dotnet/cli/issues/10528 -->
     <MicrosoftNETCorePlatformsPackageVersion>3.1.0-preview3.19561.4</MicrosoftNETCorePlatformsPackageVersion>
     <!-- Packages from aspnet/Blazor -->
-    <MicrosoftAspNetCoreBlazorMonoPackageVersion>3.1.0-preview3.19531.1</MicrosoftAspNetCoreBlazorMonoPackageVersion>
+    <MicrosoftAspNetCoreBlazorMonoPackageVersion>3.1.0-preview4.19562.1</MicrosoftAspNetCoreBlazorMonoPackageVersion>
     <!-- Packages from aspnet/Extensions -->
     <InternalAspNetCoreAnalyzersPackageVersion>3.1.0-preview3.19561.14</InternalAspNetCoreAnalyzersPackageVersion>
     <MicrosoftAspNetCoreAnalyzerTestingPackageVersion>3.1.0-preview3.19561.14</MicrosoftAspNetCoreAnalyzerTestingPackageVersion>