diff --git a/eng/Versions.props b/eng/Versions.props
index 41b5c5cdfda751f96db4bbe0e7a4e899b3b64f09..1dfddb9c991e7e4b16fa9d9e1796b97803c4ddb9 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -184,7 +184,7 @@
     <SystemRuntimeCompilerServicesUnsafeVersion>4.5.2</SystemRuntimeCompilerServicesUnsafeVersion>
     <SystemTextEncodingCodePagesVersion>4.5.1</SystemTextEncodingCodePagesVersion>
     <SystemTextEncodingExtensionsVersion>4.3.0</SystemTextEncodingExtensionsVersion>
-    <SystemThreadingTasksDataflowVersion>4.5.24</SystemThreadingTasksDataflowVersion>
+    <SystemThreadingTasksDataflowVersion>4.9.0</SystemThreadingTasksDataflowVersion>
     <!-- We need System.ValueTuple assembly version at least 4.0.3.0 on net47 to make F5 work against Dev15 - see https://github.com/dotnet/roslyn/issues/29705 -->
     <SystemValueTupleVersion>4.5.0</SystemValueTupleVersion>
     <SystemThreadingTasksExtensionsVersion>4.5.3</SystemThreadingTasksExtensionsVersion>