diff --git a/NuGet.config b/NuGet.config
index 94e5df3694d..575482bb36e 100644
--- a/NuGet.config
+++ b/NuGet.config
@@ -3,7 +3,7 @@
   <packageSources>
     <clear />
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
-    <add key="Dotnet5" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json" />
+    <!--<add key="Dotnet5" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json" />-->
   </packageSources>
   <disabledPackageSources />
 </configuration>
diff --git a/build/Common.props b/build/Common.props
index 2c8e9f49e42..88e0cdb4027 100644
--- a/build/Common.props
+++ b/build/Common.props
@@ -38,7 +38,7 @@
     <StackExchangeRedisPkgVer>[2.1.58,3.0)</StackExchangeRedisPkgVer>
     <StyleCopAnalyzersPkgVer>[1.1.118,2.0)</StyleCopAnalyzersPkgVer>
     <SystemCollectionsImmutablePkgVer>[1.4.0,2.0)</SystemCollectionsImmutablePkgVer>
-    <SystemDiagnosticSourcePkgVer>[5.0.0-rc.1.20428.3]</SystemDiagnosticSourcePkgVer>
+    <SystemDiagnosticSourcePkgVer>[5.0.0-rc.1.20451.14]</SystemDiagnosticSourcePkgVer>
     <SystemReflectionEmitLightweightPkgVer>[4.7.0,5.0)</SystemReflectionEmitLightweightPkgVer>
     <SystemTextJsonPkgVer>[4.7.0,5.0)</SystemTextJsonPkgVer>
     <SystemThreadingTasksExtensionsPkgVer>[4.5.3,5.0)</SystemThreadingTasksExtensionsPkgVer>
diff --git a/src/OpenTelemetry.Api/CHANGELOG.md b/src/OpenTelemetry.Api/CHANGELOG.md
index 79b9adbcf6b..0a1ba4e6495 100644
--- a/src/OpenTelemetry.Api/CHANGELOG.md
+++ b/src/OpenTelemetry.Api/CHANGELOG.md
@@ -2,7 +2,8 @@
 
 ## Unreleased
 
-* Updated System.Diagnostics.DiagnosticSource to version 5.0.0-rc.1.20428.3
+* Updated System.Diagnostics.DiagnosticSource to version 5.0.0-rc.1.20451.14
+  ([#1265](https://github.com/open-telemetry/opentelemetry-dotnet/pull/1265))
 * Added `GetTagValue` extension method on `Activity` for retrieving tag values
   efficiently
   ([#1221](https://github.com/open-telemetry/opentelemetry-dotnet/pull/1221))