diff --git a/eng/CodeAnalysis.src.globalconfig b/eng/CodeAnalysis.src.globalconfig
index cf423716a4f28e..be4caadbb0dc92 100644
--- a/eng/CodeAnalysis.src.globalconfig
+++ b/eng/CodeAnalysis.src.globalconfig
@@ -516,6 +516,9 @@ dotnet_diagnostic.CA2019.severity = warning
 # CA2020: Prevent behavioral changes
 dotnet_diagnostic.CA2020.severity = warning
 
+# CA2021: Do not call Enumerable.Cast<T> or Enumerable.OfType<T> with incompatible types
+dotnet_diagnostic.CA2021.severity = warning
+
 # CA2100: Review SQL queries for security vulnerabilities
 dotnet_diagnostic.CA2100.severity = none
 
diff --git a/eng/CodeAnalysis.test.globalconfig b/eng/CodeAnalysis.test.globalconfig
index 15601fcd9f104d..b64207eeaf669e 100644
--- a/eng/CodeAnalysis.test.globalconfig
+++ b/eng/CodeAnalysis.test.globalconfig
@@ -513,6 +513,9 @@ dotnet_diagnostic.CA2019.severity = none
 # CA2020: Prevent behavioral changes
 dotnet_diagnostic.CA2020.severity = none
 
+# CA2021: Do not call Enumerable.Cast<T> or Enumerable.OfType<T> with incompatible types
+dotnet_diagnostic.CA2021.severity = none
+
 # CA2100: Review SQL queries for security vulnerabilities
 dotnet_diagnostic.CA2100.severity = none