diff --git a/build/Common.props b/build/Common.props
index 564d140c6..39fc029d5 100644
--- a/build/Common.props
+++ b/build/Common.props
@@ -40,11 +40,11 @@
     <OpenTracingPkgVer>[0.12.1,0.13)</OpenTracingPkgVer>
     <StackExchangeRedisPkgVer>[2.1.58,3.0)</StackExchangeRedisPkgVer>
     <StyleCopAnalyzersPkgVer>[1.1.118,2.0)</StyleCopAnalyzersPkgVer>
-    <SystemCollectionsImmutablePkgVer>[1.4.0,6.0)</SystemCollectionsImmutablePkgVer>
-    <SystemDiagnosticSourcePkgVer>5.0.0</SystemDiagnosticSourcePkgVer>
-    <SystemReflectionEmitLightweightPkgVer>[4.7.0,6.0)</SystemReflectionEmitLightweightPkgVer>
-    <SystemTextJsonPkgVer>[4.7.0,6.0)</SystemTextJsonPkgVer>
-    <SystemThreadingTasksExtensionsPkgVer>[4.5.3,6.0)</SystemThreadingTasksExtensionsPkgVer>
+    <SystemCollectionsImmutablePkgVer>1.4.0</SystemCollectionsImmutablePkgVer>
+    <SystemDiagnosticSourcePkgVer>5.0.1</SystemDiagnosticSourcePkgVer>
+    <SystemReflectionEmitLightweightPkgVer>4.7.0</SystemReflectionEmitLightweightPkgVer>
+    <SystemTextJsonPkgVer>4.7.0</SystemTextJsonPkgVer>
+    <SystemThreadingTasksExtensionsPkgVer>4.5.3</SystemThreadingTasksExtensionsPkgVer>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/OpenTelemetry.Api/CHANGELOG.md b/src/OpenTelemetry.Api/CHANGELOG.md
index 0b6a7c73c..b57f8fb40 100644
--- a/src/OpenTelemetry.Api/CHANGELOG.md
+++ b/src/OpenTelemetry.Api/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+* Relax System.* packages version requirement to remove upper bound.
+* Require System.Diagnostics.DiagnosticSource package 5.0.1.
+
 ## 1.0.0-rc2
 
 Released 2021-Jan-29