diff --git a/NuGet.config b/NuGet.config
index 1296a3c231cb..1ea5b4e25974 100644
--- a/NuGet.config
+++ b/NuGet.config
@@ -4,7 +4,6 @@
     <clear />
     <!--Begin: Package sources managed by Dependency Flow automation. Do not edit the sources below.-->
     <!--  Begin: Package sources from dotnet-extensions -->
-    <add key="darc-pub-dotnet-extensions-0034cc0" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-extensions-0034cc0f/nuget/v3/index.json" />
     <!--  End: Package sources from dotnet-extensions -->
     <!--  Begin: Package sources from dotnet-runtime -->
     <!--  End: Package sources from dotnet-runtime -->
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index fd89e948493b..4f35c4d13e93 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -414,13 +414,13 @@
       <Uri>https://github.com/dotnet/arcade</Uri>
       <Sha>e1240639569fad610705b52713d6d6b19f8fe433</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Extensions.Diagnostics.Testing" Version="10.4.1">
+    <Dependency Name="Microsoft.Extensions.Diagnostics.Testing" Version="10.6.0-preview.1.26210.2">
       <Uri>https://github.com/dotnet/extensions</Uri>
-      <Sha>0034cc0fb682ad13c4aca3eff6f9cc80110c05e7</Sha>
+      <Sha>03a9943b2a2ebbc8e2cd9336ba1defcdaf6ffefd</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Extensions.TimeProvider.Testing" Version="10.4.1">
+    <Dependency Name="Microsoft.Extensions.TimeProvider.Testing" Version="10.6.0-preview.1.26210.2">
       <Uri>https://github.com/dotnet/extensions</Uri>
-      <Sha>0034cc0fb682ad13c4aca3eff6f9cc80110c05e7</Sha>
+      <Sha>03a9943b2a2ebbc8e2cd9336ba1defcdaf6ffefd</Sha>
     </Dependency>
     <Dependency Name="NuGet.Frameworks" Version="6.2.4">
       <Uri>https://github.com/nuget/nuget.client</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index b8ca12e077d6..7bd654b1f1e7 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -142,8 +142,8 @@
     <SystemIOHashingVersion>9.0.14</SystemIOHashingVersion>
     <SystemRuntimeCachingVersion>9.0.14</SystemRuntimeCachingVersion>
     <!-- Packages from dotnet/extensions -->
-    <MicrosoftExtensionsDiagnosticsTestingVersion>10.4.1</MicrosoftExtensionsDiagnosticsTestingVersion>
-    <MicrosoftExtensionsTimeProviderTestingVersion>10.4.1</MicrosoftExtensionsTimeProviderTestingVersion>
+    <MicrosoftExtensionsDiagnosticsTestingVersion>10.6.0-preview.1.26210.2</MicrosoftExtensionsDiagnosticsTestingVersion>
+    <MicrosoftExtensionsTimeProviderTestingVersion>10.6.0-preview.1.26210.2</MicrosoftExtensionsTimeProviderTestingVersion>
     <!-- Packages from dotnet/efcore -->
     <dotnetefVersion>9.0.14</dotnetefVersion>
     <MicrosoftEntityFrameworkCoreInMemoryVersion>9.0.14</MicrosoftEntityFrameworkCoreInMemoryVersion>