diff --git a/build/dependencies.props b/build/dependencies.props
index 87ab14569c..b088a17b01 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -119,7 +119,6 @@
     <StackExchangeRedisStrongNamePackageVersion>1.2.4</StackExchangeRedisStrongNamePackageVersion>
     <StreamJsonRpcPackageVersion>1.1.92</StreamJsonRpcPackageVersion>
     <StyleCopAnalyzersPackageVersion>1.0.0</StyleCopAnalyzersPackageVersion>
-    <SystemBuffersExperimentalPackageVersion>0.1.0-alpha-002</SystemBuffersExperimentalPackageVersion>
     <SystemBuffersPackageVersion>4.5.0-preview1-25914-04</SystemBuffersPackageVersion>
     <SystemBuffersPrimitivesPackageVersion>0.1.0-alpha-002</SystemBuffersPrimitivesPackageVersion>
     <SystemCodeDomPackageVersion>4.5.0-preview1-25914-04</SystemCodeDomPackageVersion>
diff --git a/build/external-dependencies.props b/build/external-dependencies.props
index 618fd3595f..4c77f97fd1 100644
--- a/build/external-dependencies.props
+++ b/build/external-dependencies.props
@@ -117,7 +117,6 @@
     <CoreFxLabFeed>https://dotnet.myget.org/f/dotnet-corefxlab/api/v3/index.json</CoreFxLabFeed>
   </PropertyGroup>
   <ItemGroup>
-    <ExternalDependency Include="System.Buffers.Experimental" Version="$(SystemBuffersExperimentalPackageVersion)" Source="$(CoreFxLabFeed)" Private="true" Mirror="true" />
     <ExternalDependency Include="System.Buffers.Primitives" Version="$(SystemBuffersPrimitivesPackageVersion)" Source="$(CoreFxLabFeed)" Private="true" Mirror="true" />
     <ExternalDependency Include="System.Collections.Sequences" Version="$(SystemCollectionsSequencesPackageVersion)" Source="$(CoreFxLabFeed)" Private="true" Mirror="true" />
     <ExternalDependency Include="System.IO.Pipelines.Extensions" Version="$(SystemIOPipelinesExtensionsPackageVersion)" Source="$(CoreFxLabFeed)" Private="true" Mirror="true" />
@@ -125,9 +124,7 @@
     <ExternalDependency Include="System.IO.Pipelines" Version="$(SystemIOPipelinesPackageVersion)" Source="$(CoreFxLabFeed)" Mirror="true" />
     <ExternalDependency Include="System.IO.Pipelines.Testing" Version="$(SystemIOPipelinesTestingPackageVersion)" Source="$(CoreFxLabFeed)" Mirror="true" />
     <ExternalDependency Include="System.Text.Encodings.Web.Utf8" Version="$(SystemTextEncodingsWebUtf8PackageVersion)" Source="$(CoreFxLabFeed)" Mirror="true" />
-    <ExternalDependency Include="System.Text.Formatting" Version="$(SystemTextFormattingPackageVersion)" Source="$(CoreFxLabFeed)" Private="true" Mirror="true" />
     <ExternalDependency Include="System.Text.Primitives" Version="$(SystemTextPrimitivesPackageVersion)" Source="$(CoreFxLabFeed)" Private="true" Mirror="true" />
-    <ExternalDependency Include="System.Text.Utf8String" Version="$(SystemTextUtf8StringPackageVersion)" Source="$(CoreFxLabFeed)" Private="true" Mirror="true" />
   </ItemGroup>
   <!-- Roslyn -->
   <PropertyGroup>